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Experimental study and modelling of the role of solutes, precipitates and temperature on the work-hardening of AA6xxx aluminium alloys
Araştırma Makalesi

Araştırma Makalesi
Kaynak :
Science Direct
Yayıncı :
Materials Science and Engineering: A
Yazar(lar) :
Manojit Ghosh , Alexis Miroux , Leo A.I. Kestens
Yıl :
2021
Materials Science and Engineering: A
Yayıncı Web Sitesi Tam Metin
Kaydet
Attempts have been registered scientifically mostly for strained hardened Al alloys towards improvement of formability at warm temperatures. The varieties of possible precipitate populations add complexity in determining the mechanisms of work-hardening behaviour of the precipitation hardened alloys. Efforts were made, in the current work, to investigate the work-hardening response for EN AW-6016 and EN AW-6061 sheets of different temper (T4 and T6) at room and warm temperatures (150 and 250 °C) and at two different strain rates (0.1 and 0.01 s−1) through tensile experiments. Among these variants, the influence of temperature has been detected the most on yield strength and work-hardening rate. Lowering the efficiency of storing dislocations as well as activating dynamic recovery, both are responsible for the reduction in work hardening rate proportionally with temperature. The work-hardening model originally developed by Prof. E. Nes (Nes model) has been chosen to simulate the experimental stress-strain response of both alloys at room and warm temperature as the phenomenology of the model promised a better constitutive description of work hardening. Because Nes model was primarily designed for strained hardened Al alloys, the bottleneck, to apply this model for precipitation hardened alloys, was removed by adding contribution from the precipitates in terms of mean slip length of dislocations in the current version. The validity of the model was examined for 130 °C, 150 °C and 180 °C and at a strain rate of 0.1s−1, once satisfied fitting was achieved for 6016 and 6061 alloys at RT and 250 °C at a strain rate of 0.01s−1. The decrease of dynamic recovery during the change of temper state (T4 to T6) during RT deformation can be explained as a competition between solute depletion and precipitate growth. With minute quantitative differences, the influence of strain rate and temperature was reproduced well by the model.
DOI : 10.1016/j.msea.2020.140615
Anahtar Kelimeler : Warm forming, Aluminium alloys, Work hardening, Precipitates, Modified nes model
Cilt: 805
Sayı: 0
Sayfa: 140615-0
ISSN: 0921-5093
2
Microstructure and mechanical properties of additively manufactured multi-material component with maraging steel on CrMn steel
Araştırma Makalesi

Araştırma Makalesi
Kaynak :
Science Direct
Yayıncı :
Materials Science and Engineering: A
Yazar(lar) :
Yuchao Bai , Cuiling Zhao , Yu Zhang , Hao Wang
Yıl :
2021
Materials Science and Engineering: A
Yayıncı Web Sitesi Tam Metin
Kaydet
High manufacturing freedom of additive manufacturing (AM) technology, such as selective laser melting (SLM), innovates an effective way for the fabrication of multi-material components which is highly challenging or even impossible for the conventional manufacturing processes. The bonding performance between dissimilar materials in the AMed multi-material component needs further research prior to application. In this study, maraging steel (MS1) part was manufactured on top of the cast CrMn steel using SLM to obtain a multi-material component. The microstructure of CrMn steel substrate and MS1 steel, as well as the interfacial morphology of the hybrid CrMn-MS1 component, was characterized to study the metallurgical property. The microhardness and tensile property tests were conducted to investigate the mechanical behaviour of the hybrid cast/SLM multi-material component. An interface with a width of about 130 μm was formed between the two dissimilar materials. Marangoni convection caused complex phenomena at the interface, leading to the cross-regional distribution of alloy elements and a variation in the microstructure of the first several layers of SLMed MS1. Good metallurgical bonding of the dissimilar materials manufactured by SLM is achieved without pores, inclusions or cracks in the interfacial region. The microhardness value of the interface region is 309 ± 9 HV0.05 . This mitigates the difference in performance mismatch by smoothening the mechanical-property transition between CrMn steel (277 ± 11 HV0.05) and SLMed MS1 (360 ± 9 HV0.05). The hybrid CrMn-MS1 steel presents a higher ultimate tensile strength of 986 ± 30 MPa than cast CrMn steel and higher elongation of 24.5 ± 1.0% than SLMed MS1. This study proves feasibility to manufacture a reliable multi-martial component with a cast substrate and SLMed part of potentially higher complexity.
DOI : 10.1016/j.msea.2020.140630
Anahtar Kelimeler : Selective laser melting, Multi-material, Microstructure, Mechanical properties, Maraging steel, CrMn steel
Cilt: 802
Sayı: 0
Sayfa: 140630-0
ISSN: 0921-5093
3
The effect of thermomechanical treatments on the properties of powder metallurgy Ti–5Fe alloy
Araştırma Makalesi

Araştırma Makalesi
Kaynak :
Science Direct
Yayıncı :
Materials Science and Engineering: A
Yazar(lar) :
Stella Raynova , Fei Yang , Leandro Bolzoni
Yıl :
2021
Materials Science and Engineering: A
Yayıncı Web Sitesi Tam Metin
Kaydet
In this study, the low-cost Ti–5Fe alloy was fabricated by a combination of sintering plus thermomechanical treatment (TMT). The primary aim is to improve the tensile properties of the recently widely studied powder metallurgy Ti-xFe alloys made by the press and sinter process. The effect of hot forging or extrusion and subsequent annealing treatment on the microstructure and mechanical properties of the Ti–5Fe alloy was therefore studied. TMT from temperatures in the β-phase field severely changes the microstructure of the sintered alloy. The substantial deformation of the β-grains and the formation of fine α-phase have a significant effect on the mechanical properties. The yield and ultimate tensile strengths of the TMT alloys reach high values, from 1050 MPa to over 1200 MPa. The subsequent heat treatment results in the modification of the α-phase morphology and the partial loss of the crystallographic texture, leading to the enhancement of the elongation to values above 20%, despite of the high oxygen content of the alloy.
DOI : 10.1016/j.msea.2020.140389
Anahtar Kelimeler : Thermomechanical processing, Low-cost, Tiu20135Fe, Powder metallurgy, Tensile properties, Oxygen
Cilt: 801
Sayı: 0
Sayfa: 140389-0
ISSN: 0921-5093
4
The simultaneous occurrence of Kurdjumov-Sachs and irrational orientation relationships between delta-ferrite and austenite phase in a 17Cr–5Ni stainless steel
Dergi Makalesi

Dergi Makalesi
Kaynak :
Science Direct
Yayıncı :
Materials Science and Engineering: A
Yazar(lar) :
G.L. Liu , S.W. Yang , W.T. Han , P.P. Yan , M. Wang , Q. Hu , R.D.K. Misra , C.J. Shang , F.R. Wan
Yıl :
2020
Materials Science and Engineering: A
Yayıncı Web Sitesi Tam Metin
Kaydet
We provide here insights on the simultaneous observation of Kurdjumov-Sachs (K–S) and irrational orientation relationship between delta (δ)-ferrite and austenite (γ) phase in the weldment of 17Cr–5Ni stainless steel. A partial recrystallization mechanism involving combined action of stored energy in the γ phase and strong thermal activation on δ→γ transformation is proposed to explain the abnormal phenomenon. Furthermore, γ→α transformation was induced to occur at higher temperature at high energy δ/γ interfaces, corresponding to irrational orientation relationship, which was beneficial to decrease the hardness of weldment.
DOI : 10.1016/j.msea.2020.140122
Anahtar Kelimeler : δ→γ Transformation, Non-equilibrium γ phase, Irrational orientation relationship, Partial recrystallization, γ→α Transformation
Cilt: 798
Sayı: 0
Sayfa: 140122-0
ISSN: 0921-5093
5
Microstructure evolution and enhanced mechanical properties of a Nb–Mo microalloyed medium Mn alloy fabricated by a novel cyclic quenching treatment
Araştırma Makalesi

Araştırma Makalesi
Kaynak :
Science Direct
Yayıncı :
Materials Science and Engineering: A
Yazar(lar) :
Haijun Pan , Peng jiang , Yi Zhang , Wangping Wu , Zhizhi Wang , Qi Wang , Huaying Li
Yıl :
2020
Materials Science and Engineering: A
Yayıncı Web Sitesi Tam Metin
Kaydet
Microstructure evolution and austenite stability of a Fe-6.0Mn-0.2C-1.0Al-0.05Nb-0.20Mo alloy fabricated by a novel cyclic quenching treatment were investigated. According to the experimental results, the influences of cyclic quenching treatment on retained austenite could be described as follows: (1) turning austenite grain morphology from a mixture of lamellar and equiaxed grain to the lamellar grain with the increase in cyclic quenching passes, (2) increasing austenite stability for the grain refinement (up to 0.21μm) and higher C/Mn content in austenite. In addition, cyclic quenching treatment can increase the yield strength (YS), ultimate tensile strength (UTS) and total elongation (TE) of the experimental steel up to 172 MPa, 89 MPa and 8%, respectively. The average product of UTS and TE of the experimental steel after cyclic quenching treatment could reach up to 66.6 GPa·%. Moreover, the yield point elongation increased with the increase in cyclic quenching passes.
DOI : 10.1016/j.msea.2020.140076
Anahtar Kelimeler : Microstructure evolution, Austenite stability, Cyclic quenching treatment, Grain refinement
Cilt: 797
Sayı: 0
Sayfa: 140076-0
ISSN: 0921-5093
6
Compressive creep of coarse-grain WC–Co and WC–TaC–Co hardmetals with uniform microstructure comprising rounded WC grains
Araştırma Makalesi

Araştırma Makalesi
Kaynak :
Science Direct
Yayıncı :
Materials Science and Engineering: A
Yazar(lar) :
A.A. Zaitsev , A.V. Korotitskiy , E.A. Levashov , E.N. Avdeenko
Yıl :
2020
Materials Science and Engineering: A
Yayıncı Web Sitesi Tam Metin
Kaydet
The creep process of coarse-grain WC-6%Co hardmetals with uniform microstructure comprising rounded WC grains undoped and doped with 0.2 wt% TaC was studied under uniaxial compressive loads in two temperature ranges of 300–500 K and 600–970 K. The amount of TaC added to WC–Co was below its solubility limit, so that the microstructure of the hardmetal doped with TaC did not contain grains of the second carbide phase (Ta,W)C of the order several microns in size. The creep activation energy in the medium-low temperature range (T = 300 … 500 K) is quite low and lies between 13 kJ/mol and 25 kJ/mol. The activation energy noticeably increases at higher temperatures and varies from 50 kJ/mol to 90 kJ/mol in the temperature range of 600–970 K. As a result of doping the WC-6%Co hardmetal with tantalum carbide the creep resistance significantly increases. In the temperature range of 600–900 K the doping leads to reducing creep rates by a factor of up to nine.
DOI : 10.1016/j.msea.2020.139998
Anahtar Kelimeler : Coarse-grain hardmetals, Rounded WC grains, Compressive creep, Activation energy, Creep resistance
Cilt: 795
Sayı: 0
Sayfa: 139998-0
ISSN: 0921-5093
7
Effect of cyclic frequency on uniaxial ratcheting behavior of a textured AZ31B magnesium alloy under stress control
Araştırma Makalesi

Araştırma Makalesi
Kaynak :
Science Direct
Yayıncı :
Materials Science and Engineering: A
Yazar(lar) :
Baolin Wu , Linghui Song , Guosheng Duan , Xinghao Du , Yinong Wang , Claude Esling , Marie-Jeanne Philippe
Yıl :
2020
Materials Science and Engineering: A
Yayıncı Web Sitesi Tam Metin
Kaydet
The ratcheting behavior of magnesium alloy AZ31B was investigated under controlled cyclic stress at frequencies of 0.5 Hz, 1.0 Hz and 2.0 Hz. The result showed that cyclic loading accelerates strain accumulation as compared with static creep at room temperature, and the effect of cyclic frequency on strain rate dεr/dt, represented by strain in a unit time, is of multiplicity due to the diversification of deformation mechanisms. However, strain rate dεr/dN, represented by strain in one cycle, decreases evidently with increasing frequency at steady strain accumulative stage. High frequency promotes twinning-detwinning, and is favorable for prolonging the fatigue life in terms of cyclic number to failure. The fatigue life increases linearly with decrease of plastic strain energy density under all frequency conditions. This leads to conclude that frequency affects the fatigue life via changing plastic strain energy stored in the deformed microstructure.
DOI : 10.1016/j.msea.2020.139675
Anahtar Kelimeler : Magnesium alloy, Fatigue, Cyclic frequency, Ratcheting, Twinning, Slip
Cilt: 795
Sayı: 0
Sayfa: 139675-0
ISSN: 0921-5093
8
Effect of Al2O3 coating thickness on microstructural characterization and mechanical properties of continuous carbon fiber reinforced aluminum matrix composites
Araştırma Makalesi

Araştırma Makalesi
Kaynak :
Science Direct
Yayıncı :
Materials Science and Engineering: A
Yazar(lar) :
Chengnan Zhu , Yishi Su , Di Zhang , Qiubao Ouyang
Yıl :
2020
Materials Science and Engineering: A
Yayıncı Web Sitesi Tam Metin
Kaydet
Continuous carbon fiber (CF) reinforced aluminum (Al) matrix composites have become a potential lightweight material in aerospace and commercial applications. In this work, the alumina (Al2O3) coating was uniformly synthesized on the surface of CF by the sol-gel method for improving the wettability and reducing the interfacial reaction between molten Al alloy and CF, while the Al2O3-coated CF was subsequently used to fabricate CF/Al composites via pressure infiltration technique. Effects of heat treatment temperature, immersion time, and immersion-drying cycle on the surface morphologies and mechanical properties of Al2O3-coated CF were studied, and the influences of the coating thickness on the infiltration quality and the mechanical properties of composites were also investigated by means of the microstructural analysis, interfacial characterizations and tensile property tests. The results show that the Al2O3-coated CF with excellent integrity and mechanical properties was obtained at 500 °C for 2 immersion-drying cycles by the immersion time of 5 min per cycle. The Al2O3 coating can effectively improve pressure infiltration quality and mechanical properties based on the suitable interfacial bonding strength and good wettability. The optimized Al2O3 coating thickness is 100 nm for better improving the mechanical properties of CF/Al composites.
DOI : 10.1016/j.msea.2020.139839
Anahtar Kelimeler : Continuous carbon fiber/aluminum composites, Sol-gel preparation, Alumina coating thickness, Microstructural characterization, Mechanical properties
Cilt: 793
Sayı: 0
Sayfa: 139839-0
ISSN: 0921-5093
9
Experimental investigation of initial yield surfaces of solid foams and their evolution under subsequent loading
Araştırma Makalesi

Araştırma Makalesi
Kaynak :
Science Direct
Yayıncı :
Materials Science and Engineering: A
Yazar(lar) :
M. Felten , S. Diebels , A. Jung
Yıl :
2020
Materials Science and Engineering: A
Yayıncı Web Sitesi Tam Metin
Kaydet
Metal foams exhibit excellent characteristics suitable for a variety of light weight construction applications, based on outstanding specific mechanical properties and the ability to provide a nearly constant force during energy absorption. All components are subjected to multiaxial stress states during the application. In order to ensure a safe design, yield surfaces constitute the fundamental basis for simulations. The determination of yield surfaces for metal foams is a complex challenge. In the literature yield surfaces have been usually simulated using model assumptions and rarely experimentally validated. The present contribution provides a comprehensive representation of experimentally determined yield surfaces for open-cell nickel/polyurethane (Ni/PU) hybrid metal foams. For the first time in the literature, the effect of different nickel coating thicknesses on the shape of the yield surface is systematically examined. Determining the yield surface parameters as function of the effective foam density allows for a prediction of the minimum layer thickness required for any complex loading condition. Furthermore, the development of the post-yield surfaces under increasing strain is investigated. Post-yield surfaces provide reliable information about the mechanical material behaviour under applied multiaxial stress after a certain pre-damage.
DOI : 10.1016/j.msea.2020.139762
Anahtar Kelimeler : Yield surface, Open-cell metal foam, Post-yield surface, Composite foam
Cilt: 791
Sayı: 0
Sayfa: 139762-0
ISSN: 0921-5093
10
Correlation of creep fracture lifetime with microstructure evolution and cavity behaviors in G115 martensitic heat-resistant steel
Araştırma Makalesi

Araştırma Makalesi
Kaynak :
Science Direct
Yayıncı :
Materials Science and Engineering: A
Yazar(lar) :
Yunhe Yu , Zhengdong Liu , Chi Zhang , Zhongding Fan , Zhengzong Chen , Hansheng Bao , Hao Chen , Zhigang Yang
Yıl :
2020
Materials Science and Engineering: A
Yayıncı Web Sitesi Tam Metin
Kaydet
In order to deepen the understanding towards the creep rupture lifetime of G115 martensitic heat-resistant steel, a series of creep tests using 130–200MPa loading stresses at 923K were carried out to investigate the as-crept microstructural characteristics and cavity behaviors. The significant microstructure deformation and a dramatic increase in the areal density of high-angle grain boundaries occur when the stress loading is over 160MPa. Apart from the strain concentration at elongated grain boundaries and refined grains, the elevated stress also leads to the appearance of a strong α-fiber texture with {001}<110>//RD. The nucleation and growth of cavities can be effectively accelerated by the stress elevation, and ductile fracture is determined as the dominate mechanism within the test stresses. However, a transition towards brittle intergranular fracture is observed due to the rapid coarsening of Laves phase. Furthermore, a good prediction for creep lifetimes of G115 steel has been obtained based on the constrained diffusional cavity growth model.
DOI : 10.1016/j.msea.2020.139468
Anahtar Kelimeler : Heat-resistant steels, As-crept microstructure, Cavity behaviors, Fracture lifetime prediction
Cilt: 788
Sayı: 0
Sayfa: 139468-0
ISSN: 0921-5093
11
Effect of the Mg contents on the annealing mechanism and shear texture of Al–Mg alloys
Araştırma Makalesi

Araştırma Makalesi
Kaynak :
Science Direct
Yayıncı :
Materials Science and Engineering: A
Yazar(lar) :
Chang-Hee Cho , Kwang-Tae Son , Jae-Cheol Lee , Shae K. Kim , Young-Ok Yoon , Soong-Keun Hyun
Yıl :
2020
Materials Science and Engineering: A
Yayıncı Web Sitesi Tam Metin
Kaydet
As conventional Al–Mg alloys have a high stacking fault energy (SFE), a copper type texture evolves when it is deformed and annealed at ambient temperatures. Generally, the SFE decreases as the Mg content increases. If the SFE decreases sufficiently, the microstructure texture can change from copper to brass type. To achieve good formability with an optimal microstructure texture, severe plastic deformation (SPD) processes have been studied, and these processes mainly have shear deformation mode. As a type of SPD test, a torsion test is a method to obtain data for shear deformed materials. In this study, the effects of the Mg content on the evolution of shear and annealing textures of Al–Mg alloys were investigated using torsion tests. Al–6Mg and Al–9Mg alloys were deformed to a strain of 0.35 at a strain rate of 0.1 s−1 at room temperature. After the materials were torsioned, an annealing process was conducted at 300 °C for 0–60 min for the deformed specimens. The electron backscattered diffraction technique was used to evaluate the microstructural texture of the samples after the suggested steps. As the Mg content increases under the same processing condition, a transition from copper to brass type was observed. A high Mg content resulted in an increase in stored energy. The variation in stored energy is related directly to the evolution of the annealing texture and its mechanism.
DOI : 10.1016/j.msea.2020.139471
Anahtar Kelimeler : Al-Mg alloys, Texture evolution, Mg content, Stacking fault energy, Torsion test
Cilt: 786
Sayı: 0
Sayfa: 139471-0
ISSN: 0921-5093
12
The brittleness of post-treatment of 3D printed Zr-based metallic glasses in supercooled liquid state
Araştırma Makalesi

Araştırma Makalesi
Kaynak :
Science Direct
Yayıncı :
Materials Science and Engineering: A
Yazar(lar) :
Di Ouyang , Qian Zheng , Liang Wang , Hao Wang , Chong Yang , Pengcheng Zhang , Ning Li
Yıl :
2020
Materials Science and Engineering: A
Yayıncı Web Sitesi Tam Metin
Kaydet
3D printed technique of selective laser melting (SLM) has attracted great attention in fabricating bulk metallic glass (BMG) due to its superiority on fabrication of large-sized BMGs with desirable geometries. However, compared to traditional casting BMGs, 3D printed BMGs present brittleness due to annealing effect in 3D printing process. Rejuvenation treatment in supercooled liquid state was expected to improve the plasticity by increasing free volume in amorphous phases. Here, 3D printed Zr55Cu30Al10Ni5 BMG was selected to perform heat treatment. The results reveal that both molten pool and heat affected zone are gone soft after heat treatment because of the increasing free volume in amorphous phases. However, tiny micro-cracks induced by non-uniform thermal deformation during quenching process deteriorate the macroscopic mechanical properties. The present work provides an understanding on heat treatment to 3D printed BMG that free volume can be introduced successfully and soften the amorphous phases, but need a suitable cooling rate to restrain micro-cracks.
DOI : 10.1016/j.msea.2020.139259
Anahtar Kelimeler : Selective laser melting, Metallic glass, Heat treatment, Supercooled liquid
Cilt: 782
Sayı: 0
Sayfa: 139259-0
ISSN: 0921-5093
13
Selective laser melting of Ti6Al4V: Effect of laser re-melting
Araştırma Makalesi

Araştırma Makalesi
Kaynak :
Science Direct
Yayıncı :
Materials Science and Engineering: A
Yazar(lar) :
J. Karimi , C. Suryanarayana , I. Okulov , K.G. Prashanth
Yıl :
2021
Materials Science and Engineering: A
Yayıncı Web Sitesi Tam Metin
Kaydet
Microstructural inhomogeneity in additively manufactured materials affects the material properties. The present study aims in minimizing such microstructural inhomogeneity in Ti6Al4V alloy fabricated using selective laser melting (SLM) from the gas atomized powder. A detailed and systematic study of the effect of remelting on the microstructure and mechanical properties of Ti6Al4V was undertaken. Acicular α′ martensite was present in all the samples (both in the as-built SLM and remelted) and the dimensions of the α′ phase change with the number of melting steps. The hardness of the as-built SLM sample increased and the material got homogenized with an increasing number of meltings. The ultimate tensile strength was higher in the double- and triple-melted samples while the ductility was lower than the single-melted sample. The present results clearly prove that the number of remeltings play a significant role in determining the microstructure (homogenization of the microstructure) and the mechanical properties of the SLM-built materials.
DOI : 10.1016/j.msea.2020.140558
Anahtar Kelimeler : Additive manufacturing, Selective laser melting, Laser remelting, Microstructure, Ti6Al4V
Cilt: 805
Sayı: 0
Sayfa: 140558-0
ISSN: 0921-5093
14
Repeatability of the fatigue performance of additively manufactured A357.0 under different thermal treatment conditions
Araştırma Makalesi

Araştırma Makalesi Open Access
Kaynak :
Science Direct
Yayıncı :
Materials Science and Engineering: A
Yazar(lar) :
S. Defanti , E. Bassoli
Yıl :
2021
Materials Science and Engineering: A
Yayıncı Web Sitesi Tam Metin
Kaydet
A357.0 parts were produced by laser-based powder bed fusion. An in-situ annealing strategy was applied by pre-heating the build platform, in order to relieve residual stresses and reduce anisotropic effects upon processing. The mean value and standard deviation for the fatigue strength at the given life time of 1 × 107 cycles were determined according to the staircase method, before and after T6 heat treatment. Samples parallel to the build platform and parallel to the growth direction were analysed separately and compared. The fatigue behaviour was substantially insensitive to post-processing heat treatment, since fracture initiation was governed by sub-surface lack-of-fusion defects that remained unchanged in the T6 conditions. The heat treatment caused an increase in porosity, yet without significant detriment to the fatigue resistance. The build orientation was not found to affect the average value of the fatigue strength, but it caused variations of the repeatability.
DOI : 10.1016/j.msea.2020.140594
Anahtar Kelimeler : A357.0, Laser-based powder bed fusion, Additive manufacturing, Thermal treatment, Fatigue
Cilt: 805
Sayı: 0
Sayfa: 140594-0
ISSN: 0921-5093
15
Influence of Ta content on microstructure and creep behavior of a Ni–Co base disc superalloy
Araştırma Makalesi

Araştırma Makalesi
Kaynak :
Science Direct
Yayıncı :
Materials Science and Engineering: A
Yazar(lar) :
C.Z. Zhu , R. Zhang , C.Y. Cui , Y.Z. Zhou , F.G. Liang , X. Liu , X.F. Sun
Yıl :
2021
Materials Science and Engineering: A
Yayıncı Web Sitesi Tam Metin
Kaydet
This study investigated the influence of Ta content (i.e. 0 wt%, 2 wt%, and 4 wt%) on microstructure and creep behavior of a Ni–Co base disc superalloy at 760 °C/480 MPa. It was found that creep rupture life and the minimum creep strain rate showed a trend of first increase and then decrease with the increase of Ta content. The microstructure observations indicated that Ta addition promoted the increase of volume fraction of γ′, the precipitation of MC carbide and η-phase, but inhibited the growth of γ′ and the precipitation of M23C6 carbide at grain boundaries during creep. The mechanisms related to creep behavior were discussed, and it was deemed that the higher γ′ volume fraction, finer size of γ′, larger γ/γ′ misfit, lower atomic diffusion rate, inhibited M23C6 carbide and the palisade-like distribution of η-phase may be responsible for the enhancement of the primary and tertiary creep resistance.
DOI : 10.1016/j.msea.2020.140646
Anahtar Kelimeler : Niu2013Co base superalloy, Tantalum, Microstructure, Creep behavior
Cilt: 802
Sayı: 0
Sayfa: 140646-0
ISSN: 0921-5093
16
Achieving an exceptional ductility at room temperature in a low SFE copper alloy fabricated by severe plastic deformation
Araştırma Makalesi

Araştırma Makalesi
Kaynak :
Science Direct
Yayıncı :
Materials Science and Engineering: A
Yazar(lar) :
Seyed Elias Mousavi , Ali Sonboli , Mahmood Meratian , Mohabbat Amirnejad , Seyed Hadi Mohamadi Azghandi , Paul Munroe
Yıl :
2021
Materials Science and Engineering: A
Yayıncı Web Sitesi Tam Metin
Kaydet
Low stacking fault energy alloys often exhibit low ductility. However, sometimes these alloys show unusual mechanical behavior following specific processing parameters. In this study, a low stacking fault energy α+β brass was processed by equal channel angular pressing (ECAP) at 350 °C in ‘route C’ through three passes. Room temperature tensile testing showed that ductility, surprisingly, reached ~80%, whilst good tensile strength was maintained. Investigation of alloy microstructure revealed a combination of deformation mechanisms, including slip and twinning, accompanied by grain boundary serration and grain fragmentation. It is suggested that these deformation modes triggered these unexpected mechanical properties in this intrinsically brittle alloy. The required energy for discontinuous recrystallization was supplied after only one pass in the α phase, and three passes in the β phase, which then prompted good ductility. In order to study texture evolution, the macro-texture was measured. A high fraction of recrystallized grains and change in strain path fostered the development of Goss, Rotated Goss and Rotated Cube components in the α phase. While in the β phase {011}<111> and Goss components were dominant. Despite the high Schmid factor, Hall-Petch effects and work hardening led to increase of strength and hardness after the final pass.
DOI : 10.1016/j.msea.2020.140654
Anahtar Kelimeler : Copper alloys, Severe plastic deformation, Recrystallization, Ductility, Deformation mechanisms, Texture
Cilt: 802
Sayı: 0
Sayfa: 140654-0
ISSN: 0921-5093
17
An examination of microstructural evolution in a Pb–Sn eutectic alloy processed by high-pressure torsion and subsequent self-annealing
Araştırma Makalesi

Araştırma Makalesi
Kaynak :
Science Direct
Yayıncı :
Materials Science and Engineering: A
Yazar(lar) :
Nian Xian Zhang , Megumi Kawasaki , Yi Huang , Terence G. Langdon
Yıl :
2021
Materials Science and Engineering: A
Yayıncı Web Sitesi Tam Metin
Kaydet
The Pb–Sn alloy has a wide use in the electronic, energy storage and nuclear industries and a fine-grained Pb–Sn alloy may open up new possibilities for applications in these industries. In order to understand the behavior of grain refinement, a Pb-62% Sn eutectic alloy was processed by high-pressure torsion (HPT), stored at room temperature (RT) and then the microstructures of the alloy after HPT were repeatedly investigated during the course of self-annealing using electron backscatter diffraction, scanning electron microscopy and transmission electron microscopy. It is demonstrated that there is a large fraction of twin boundaries with a twin relationship of 62.8°<100> in the microstructure of the initial as-cast condition. Due to the presence of the high imposed pressure, the mobility of Ʃ21 boundaries at 71° is greatly favoured during processing by HPT. After the high pressure is removed, the mobility of dislocation-twin boundaries near 62.8°<100> is then favoured. Processing by HPT significantly increases the solubility of Sn in the Pb phase. The supersaturated state of Sn in Pb is not stable during self-annealing at RT and instead a decomposition of Sn from the Pb-rich phase is observed after storage for 16 days. The main mechanism for this decomposition is lattice diffusion.
DOI : 10.1016/j.msea.2020.140653
Anahtar Kelimeler : High-pressure torsion, Pbu2013Sn alloy, Self-annealing, Solubility, Twin boundaries
Cilt: 802
Sayı: 0
Sayfa: 140653-0
ISSN: 0921-5093
18
Refinement of the Ti-17 microstructure after hot deformation: Coupled mesoscale model
Araştırma Makalesi

Araştırma Makalesi
Kaynak :
Science Direct
Yayıncı :
Materials Science and Engineering: A
Yazar(lar) :
Ricardo Henrique Buzolin , David Canelo-Yubero , Fernando Warchomicka , Michael Lasnik , Alfred Krumphals , Maria Cecilia Poletti
Yıl :
2021
Materials Science and Engineering: A
Yayıncı Web Sitesi Tam Metin
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The thermo-mechanical processing of Ti-alloys comprises several steps where complex deformation and temperature cycles are achieved. In this work, the static recrystallization behaviour of a Ti-17 alloy is investigated using ex-situ characterization and in-situ synchrotron radiation experiments aiming to understand the operating mechanisms and to establish the recrystallization kinetics. Hot compression in the β- field for different strain rates is applied to provide different initial microstructures before isothermal heat treatments and continuous cooling. Strain induced boundary migration is the main operating nucleation mechanism during static recrystallization. A simple mesoscale model is proposed to couple the evolution of the microstructure during hot deformation followed by annealing considering the heterogeneity of deformation within the β-grains, for the nucleation and growth of grains and the formation of the substructure by static recovery. Electron backscattered diffraction measurements are used after isothermal annealing and continuous cooling treatments to validate the model. A strong influence of the localization of deformation in the vicinity of the prior β-high angle grain boundaries is observed and empirically implemented in the mesoscale model. The strong influence of the temperature is attributed to the difference in high angle grain boundary mobility during static recrystallization. Grain refinement is not successfully achieved up to the investigated strain due to the insufficient nucleation rate with respect to the growth rate. However, a homogenous recrystallized microstructure is observed. The model can predict the microstructure for any starting microstructure, even beyond the experimental validation.
DOI : 10.1016/j.msea.2020.140268
Anahtar Kelimeler : Static recrystallization, Ti-17, Strain induced boundary migration, Mesoscale modelling, Nucleation, Grain growth, Static recovery, In-situ synchrotron X-Ray diffraction
Cilt: 800
Sayı: 0
Sayfa: 140268-0
ISSN: 0921-5093
19
Relationship between ductility and the porosity of additively manufactured AlSi10Mg
Araştırma Makalesi

Araştırma Makalesi
Kaynak :
Science Direct
Yayıncı :
Materials Science and Engineering: A
Yazar(lar) :
Christopher M. Laursen , Stephanie A. DeJong , Sara M. Dickens , Andrea N. Exil , Donald F. Susan , Jay D. Carroll
Yıl :
2020
Materials Science and Engineering: A
Yayıncı Web Sitesi Tam Metin
Kaydet
Additive manufacturing via selective laser melting can result in variable levels of internal porosity both between build plates and within components from the same build. In this investigation, sample porosity levels were compared to tensile properties for 176 samples spanning eight different build plates. Sample porosity was measured both by Archimedes density, which provided an estimation of overall porosity, and by observation of voids in the fracture surface, which provided an estimation of the porosity at the failure plane. The porosity observed at the fracture surface consistently demonstrated higher porosity than that suggested by Archimedes density. The porosity values obtained from both methods were compared against the mechanical results. Sample porosity appears to have some correlation to the ultimate tensile strength, yield strength, and modulus, but the strongest relationship is observed between porosity and ductility. Three different models were used to relate the fracture surface porosity to the ductility. The first method was a simple linear regression analysis, while the other two models have been used to relate porosity to ductility in cast alloys. It is shown that all three models fit the data well over the observed porosity ranges, suggesting that the models taken from casting theory can extend to additively manufactured metals. Finally, it is proposed that the non-destructive Archimedes method could be used to estimate an approximate sample ductility through the use of correlations realized here. Such a relationship could prove useful for design and for a deeper understanding of the impact of pores on tensile behavior.
DOI : 10.1016/j.msea.2020.139922
Anahtar Kelimeler : High throughput tensile testing, Aluminum, Elongation to failure, Voids, Archimedes density, Selective laser melting
Cilt: 795
Sayı: 0
Sayfa: 139922-0
ISSN: 0921-5093
20
Microstructure evolution and strengthening by cold rolling of CrMnFeCoNi high-entropy alloy processed by spray forming
Araştırma Makalesi

Araştırma Makalesi
Kaynak :
Science Direct
Yayıncı :
Materials Science and Engineering: A
Yazar(lar) :
G.H. Sousa , G. Zepon , E.M. Mazzer
Yıl :
2020
Materials Science and Engineering: A
Yayıncı Web Sitesi Tam Metin
Kaydet
High-entropy alloys (HEAs) are defined as alloys containing five or more major elements in atomic fractions ranging from 5 to 35%at. Despite the presence of a large number of components, CrMnFeCoNi HEAs show simple FCC crystal structure.This work reports the effects of cold rolling on the final microstructure and the mechanical properties of a CrMnFeCoNi HEA processed by spray forming and deformed to 30, 50, 90 and 146% of true strain. The results presented an alloy with excellent workability and exhibited a large work hardening capacity in cold rolling. It is concluded that the main deformation and hardening mechanisms during cold work are associated with the nanotwinning deformation of this alloy.
DOI : 10.1016/j.msea.2020.139814
Anahtar Kelimeler : High-entropy alloys, Spray-forming, Cold rolling, Microstructure, Nanotwins, Dynamic Hall-Petch
Cilt: 793
Sayı: 0
Sayfa: 139814-0
ISSN: 0921-5093
21
Effect of grain size on the recovery strain in a new Ti–20Zr–12Nb–2Sn superelastic alloy
Dergi Makalesi

Dergi Makalesi
Kaynak :
Science Direct
Yayıncı :
Materials Science and Engineering: A
Yazar(lar) :
J.J. Gao , I. Thibon , P. Castany , T. Gloriant
Yıl :
2020
Materials Science and Engineering: A
Yayıncı Web Sitesi Tam Metin
Kaydet
In this study, the superelastic performance of a new β-type Ti–20Zr–12Nb–2Sn alloy has been investigated by means of cyclic tensile tests, electron back-scattered diffraction (EBSD) and in situ synchrotron X-ray diffraction (SXRD). It is shown that the β-grain size has an important influence on the superelastic property and for the same crystallographic texture, the smaller the grain size, the greater the recovery strain.
DOI : 10.1016/j.msea.2020.139878
Anahtar Kelimeler : Titanium alloy, Superelasticity, Grain size, Texture
Cilt: 793
Sayı: 0
Sayfa: 139878-0
ISSN: 0921-5093
22
Enhanced strength and ductility synergy in aluminum composite with heterogeneous structure
Dergi Makalesi

Dergi Makalesi
Kaynak :
Science Direct
Yayıncı :
Materials Science and Engineering: A
Yazar(lar) :
Xinxin Zhu , Guohao Cao , Jinling Liu , Ke Zhao , Linan An
Yıl :
2020
Materials Science and Engineering: A
Yayıncı Web Sitesi Tam Metin
Kaydet
A new heterogeneous aluminum composite was synthesized by one step mechanical milling followed by hot pressing sintering to evade the strength–ductility trade-off. The heterogeneous structure of the composite was composed of coarse-grained Al embedded in ultrafine-grained Al reinforced by Al2O3 nanoparticles. Compared to nanocrystalline Al and bimodal Al, an excellent combination of high strength and high ductility was obtained for the extruded composite specimen. The enhanced strength and ductility could be partially attributed to the induction of geometrically necessary dislocations resulting in back stress strengthening. The new strategy is expected to be applicable to other metal matrix composites and alloys.
DOI : 10.1016/j.msea.2020.139431
Anahtar Kelimeler : Heterogeneous, Aluminum, Composites, Strain gradient, Mechanical properties
Cilt: 787
Sayı: 0
Sayfa: 139431-0
ISSN: 0921-5093
23
Improvement of strength, toughness and ductility in ultrafine-grained low-carbon steel processed by warm bi-axial rolling
Araştırma Makalesi

Araştırma Makalesi
Kaynak :
Science Direct
Yayıncı :
Materials Science and Engineering: A
Yazar(lar) :
Tadanobu Inoue , Rintaro Ueji
Yıl :
2020
Materials Science and Engineering: A
Yayıncı Web Sitesi Tam Metin
Kaydet
A 0.15%C-0.3%Si-1.5%Mn steel bar with ultrafine elongated grain structures of transverse grain size 1.2 μm was fabricated via multi-pass bi-axial rolling process at a warm working temperature. For comparison, conventionally quenched and tempered 0.29%C steel and 1.03%C steel with a martensitic structure and 0.15% low-carbon steel with a ferrite/pearlite structure were also prepared. The full-size Charpy V-notch impact and tensile tests were conducted at a temperature range of −196 °C to 200 °C, and the relationship between microstructures, yield stress, reduction in area and impact energy was studied. In the developed steel bar, the main orientation in the microstructure changed in the cross-sectional plane, and it was dominated by {001}<100> cube orientation at the center, {111}<110> at the quarter and rolling direction//<110> at the surface. Crack branching started to occur with decreasing temperature in the Charpy test. The fracture surfaces are very complicated at temperatures below −100 °C and the specimen did not separate into two pieces even at a low temperature of −196 °C. The strength–toughness balance of the developed steel was significantly improved compared with conventional steels. This advantage in the developed steel was also seen in the strength–reduction in area balance. As a result, the steel fabricated by warm bi-axial rolling was best balance in correlation between strength and ductility and between strength and toughness at all temperatures.
DOI : 10.1016/j.msea.2020.139415
Anahtar Kelimeler : Charpy impact energy, Bi-axial rolling, Steels, Ultrafine grained microstructure, Toughening, Texture
Cilt: 786
Sayı: 0
Sayfa: 139415-0
ISSN: 0921-5093
24
Tailoring hardness gradient in Ni50·3Ti29.7Hf20 high temperature shape memory alloy through thermal treatment
Araştırma Makalesi

Araştırma Makalesi
Kaynak :
Science Direct
Yayıncı :
Materials Science and Engineering: A
Yazar(lar) :
Qin Yang , Jie Chen , Shengwang Zhang , Jiqiang Ge , Yonghao Zhang , Shuke Huang , Xiebin Wang
Yıl :
2020
Materials Science and Engineering: A
Yayıncı Web Sitesi Tam Metin
Kaydet
NiTiHf alloys are functional materials with the ability to recover shape changes at temperatures above 100 °C because of their high phase transformation temperatures. Herein, the tailoring of the hardness gradient of Ni50·3Ti29.7Hf20 (at.%) alloy through thermal treatment is reported. Upon tailoring the hardness gradient, the compressive ductility and shape memory properties remain unaffected through a careful selection of thermal treatment. After oxidation treatment at 1000 °C for 2.5 h, the hardness of the sample increases remarkably from 508 HV in the central region to 745 HV in the peripheral region. Moreover, almost no losses in compressive ductility and shape memory properties (with 6% pre-strain) are observed. Detailed microstructural analysis indicates that a composition gradient is formed from the center to the edge of the sample due to the oxidation of Ti and Hf at elevated temperatures. The composition gradient results in different precipitation behavior, because of which the hardness gradient is observed from the center to the sample edge. The results obtained in this study can allow additional potential applications of NiTiHf high temperature shape memory alloys.
DOI : 10.1016/j.msea.2020.139518
Anahtar Kelimeler : High temperature shape memory alloy, NiTiHf, Hardness gradient, Aging treatment, Precipitation, Oxidation
Cilt: 787
Sayı: 0
Sayfa: 139518-0
ISSN: 0921-5093
25
Corrigendum to “In-situ synthesis of MgAlB4 whiskers as a promising reinforcement for aluminum matrix composites” Mater. Sci. Eng. A 764 (2019) 138229
Dergi Makalesi

Dergi Makalesi Open Access
Kaynak :
Science Direct
Yayıncı :
Materials Science and Engineering: A
Yazar(lar) :
Fucheng Wang , Jiajun Li , Chunsheng Shi , Enzuo Liu , Chunnian He , Naiqin Zhao
Yıl :
2020
Materials Science and Engineering: A
Yayıncı Web Sitesi Tam Metin
Kaydet
DOI : 10.1016/j.msea.2020.139422
Cilt: 785
Sayı: 0
Sayfa: 139422-0
ISSN: 0921-5093
26
Determining volume fractions of γ, γ′, γ″, δ, and MC-carbide phases in Inconel 718 as a function of its processing history using an advanced neutron diffraction procedure
Araştırma Makalesi

Araştırma Makalesi
Kaynak :
Science Direct
Yayıncı :
Materials Science and Engineering: A
Yazar(lar) :
Nicholas C. Ferreri , Sven C. Vogel , Marko Knezevic
Yıl :
2020
Materials Science and Engineering: A
Yayıncı Web Sitesi Tam Metin
Kaydet
In this work, quantitative crystallographic and microstructural analyses of γ, γ′, γ″, δ, and MC carbide phases are performed on wrought samples, samples fabricated via additive manufacturing (AM), and samples that underwent hot isostatic pressing (HIP) after AM of alloy Inconel 718 (IN718). In doing so, an advanced neutron diffraction-based procedure is developed facilitating the determination of volume fractions of every detectable phase in the alloy. To supplement the diffraction procedure, precipitate sizes are measured by scanning electron microscopy. Moreover, semi-quantitative elemental analyses are performed by energy dispersive spectroscopy. Finally, image thresholding is carried out on micrographs of samples that underwent cathodic dissolution to create secondary electron contrast between phases to verify the phase fractions determined from the neutron diffraction datasets. The study reveals a significantly higher volume fraction of δ phase and a significantly lower volume fraction of γ″ phase governing a higher strength of the AM material relative to the lower strength AM + HIP and wrought materials. Furthermore, γ′ and MC volume fractions are found similar in the materials despite the differences in MC morphology, elemental composition and distribution controlling the dispersion strengthening. These results are presented and discussed in this paper along with the procedure developed for determining volume fractions of all detectable phases present in the alloy.
DOI : 10.1016/j.msea.2020.139228
Anahtar Kelimeler : Phase composition, Precipitates, Neutron diffraction, Additive manufacturing, Inconel 718
Cilt: 781
Sayı: 0
Sayfa: 139228-0
ISSN: 0921-5093
27
Quantifying physical parameters to predict brittle/ ductile behavior
Araştırma Makalesi

Araştırma Makalesi
Kaynak :
Science Direct
Yayıncı :
Materials Science and Engineering: A
Yazar(lar) :
William W. Gerberich , Kevin M. Schmalbach , Youxing Chen , Eric Hintsala , Nathan A. Mara
Yıl :
2021
Materials Science and Engineering: A
Yayıncı Web Sitesi Tam Metin
Kaydet
The brittle to ductile transition (BDT) is difficult to predict without extensive fitting parameters or tuning to a particular material. Currently, predicting fracture through extensive fitting or computationally expensive algorithms is high in both cost and time required to capture the relevant deformation physics. Presented here is analysis using a comparatively high throughput analytical model to predict fracture behavior using relatively few key experimentally determined parameters: activation volume, shear stress, and activation energy. This approach could reduce the time scale to predict fracture and thus accelerate new materials discovery. The current work utilizes seminal studies to provide the inputs for validating our approach via two single crystal materials, Si and W, which both have marginal toughness at low temperatures. It is shown that knowledge of underlying deformation mechanisms (still in progress) coupled to rapid determination of physical quantities (shear stress, activation volumes, and dislocation shielding) promotes unique discovery and opportunities, including future application to polycrystalline materials and phenomena. The technique, using literature values for physical parameters, correlates well to experimental fracture behavior for these two different classes of materials, semiconductors and metals, offering new opportunities for broader study.
DOI : 10.1016/j.msea.2021.140899
Anahtar Kelimeler : Characterization, Micromechanics, Fracture mechanics, Plasticity
Cilt: 808
Sayı: 0
Sayfa: 140899-0
ISSN: 0921-5093
28
Laser metal deposited steel alloys with uniform microstructures and improved properties prepared by addition of small amounts of dispersed Y2O3 nanoparticles
Araştırma Makalesi

Araştırma Makalesi
Kaynak :
Science Direct
Yayıncı :
Materials Science and Engineering: A
Yazar(lar) :
Xiao-yu Liu , Yi Sui , Jin-bao Li , Yi-ming Li , Xiao-hua Sun , Chang-sheng Liu
Yıl :
2021
Materials Science and Engineering: A
Yayıncı Web Sitesi Tam Metin
Kaydet
Steel is the most common engineering material used in additive manufacturing. In this work, 100-layers wall structures of 17Cr2NiSi steel alloys were successfully fabricated by laser metal deposition (LMD) in the presence of small dispersed amounts of Y2O3 nanoparticles without additional heat treatment. The effects of added amounts of Y2O3 nanoparticles on the microstructure, formability, microhardness, and tensile properties were all investigated. The results indicated a decline in many features, including formation of columnar and dendrite solidification structures, elongated grains in the build direction, pronounced crystallographic textures, and interlayer heat-affected zone. The reason for this was associated with the dissociation effect of Y3+ ions on dendrites by decreasing the melting point of the material, combined with the low-energy heterogeneous nucleation effect of Y elements on the grains through segregation into Si–Y–O particles. Meanwhile, minor amounts of Y element (<10 ppm)promoted the distribution and dispersion of Si particles in the modified materials, while the majority of Y element inhibited the formation of chromium oxide phase to generate Y2O3 as slagging. This led to lower remnant porosity and uniformly modified wall microstructures. The presence of nano-Y2O3 improved the 3D printing properties of LMD stainless steel in terms of preferable formability (16.4% up), uniform micro-hardness, and uniform tensile properties. In sum, these findings look promising for future fabrication of alloy steel by LMD method.
DOI : 10.1016/j.msea.2021.140827
Anahtar Kelimeler : Laser melting deposition, Alloy steel, Y2O3 nanoparticle, Uniform properties
Cilt: 806
Sayı: 0
Sayfa: 140827-0
ISSN: 0921-5093
29
Engineering mechanical properties by controlling the microstructure of an Fe–Ni–Mn martensitic steel through pre-cold rolling and subsequent heat treatment
Araştırma Makalesi

Araştırma Makalesi
Kaynak :
Science Direct
Yayıncı :
Materials Science and Engineering: A
Yazar(lar) :
Hamidreza Koohdar , Pouya Hakimipour , Hamid Reza Jafarian , Terence G. Langdon , Mahmoud Nili-Ahmadabadi
Yıl :
2021
Materials Science and Engineering: A
Yayıncı Web Sitesi Tam Metin
Kaydet
Experiments were conducted to examine the effects of prior cold rolling and subsequent heat treatment on the microstructure, phase evolution and mechanical properties of an Fe–10Ni–7Mn martensitic steel. The results show that 70% cold rolling leads to deformation-induced austenite formation in the microstructure and reduces the size of the martensite blocks. Prior cold rolling increases the reversed austenite volume fraction under post-deformation intercritical annealing (PDIA) at 600 °C compared with the solution annealed condition. Electron back scattering diffraction and dilatometric studies showed that under PDIA there is a reverse transformation of martensite to austenite through a sequential combination of martensitic and diffusional mechanisms. There is also a precipitation of θ-NiMn particles in the PDIA specimen after subsequent ageing leading to an increase in the ultimate tensile strength in tensile testing. Cyclic tensile testing revealed pseudoelastic behavior in the cold-rolled specimen but this disappeared after PDIA and appeared again after subsequent ageing.
DOI : 10.1016/j.msea.2021.140760
Anahtar Kelimeler : Deformation-induced austenite, Feu2013Niu2013Mn martensitic Steel, Microstructure control, Post-deformation intercritical annealing, Reverse transformation
Cilt: 804
Sayı: 0
Sayfa: 140760-0
ISSN: 0921-5093
30
Microstructure and mechanical response of gas tungsten arc welded joints comprising a UNS N10003 alloy with different heat inputs
Araştırma Makalesi

Araştırma Makalesi
Kaynak :
Science Direct
Yayıncı :
Materials Science and Engineering: A
Yazar(lar) :
Shuangjian Chen , Tianbing He , Libin Zhao , D.K.L. Tsang
Yıl :
2021
Materials Science and Engineering: A
Yayıncı Web Sitesi Tam Metin
Kaydet
UNS N10003 alloys are one of the key structural materials for molten salt reactors. The welds stability of components in the reactors is an important issue because of the requirement for safe nuclear plant operation. In this paper, automatic gas tungsten arc welding was employed to weld a UNS N10003 alloy, the influence of welding heat input on the microstructure, Vickers hardness, tensile properties and impact toughness of the heat affected zone (HAZ) and weld metal in the prepared joints were investigated. Results show an increasing heat input widened the carbides eutectic reaction zone in the HAZ. For all heat inputs, the base metal had the lowest hardness in comparison with the weld metal and HAZ in the joint, while a higher heat input could induce a lower hardness in the weld metal. During tensile tests at 650 °C, the weld joints fractured at the base metal irrespective of heat inputs. Different heat inputs did not show significant influence on the tensile properties and impact toughness. Our work indicates the UNS N10003 alloy has good weldability, and the performance of the welded joint is stable even when using a wide range of heat inputs.
DOI : 10.1016/j.msea.2020.140494
Anahtar Kelimeler : Nickel-based alloy, Welding heat inputs, Microstructure, Hardness, Tensile properties, Fracture morphology
Cilt: 803
Sayı: 0
Sayfa: 140494-0
ISSN: 0921-5093

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