Materials Science and Engineering: A最新文献

英文中文

Microstructure evolution and strength-ductility synergy in friction stir welded ZrB2/7085Al-Er nanocomposite joints

IF 6.1 2区材料科学 Q1 MATERIALS SCIENCE, MULTIDISCIPLINARY

Materials Science and Engineering: A

Pub Date : 2025-02-01 DOI: 10.1016/j.msea.2024.147734

Xu Gao, Xizhou Kai, Chengchao Du, Kelun Sun, Chuang Guan, Dingran Wang, Hanfei Zhu, Yutao Zhao

Dispersed nanoparticles are expected to improve the weldability of 7085Al alloy for load-bearing structure of aerospace vehicles. In this work, Er elements were added to enable ZrB₂ nanoparticle dispersion through the modified interface and then the well-designed in-situ ZrB₂/7085Al-Er nanocomposites were joined by friction stir welding (FSW). The results showed that the coherent (10

\overline{1}

0)_ZrB2//(111)_Al3Er//(111)_Al interface constructed by primary Al₃Er improved the interfacial wettability between ZrB₂ and Al, enabling the dispersion of ZrB₂ nanoparticle during solidification. After FSW, finer equiaxed recrystallized grains were formed in the nugget zone (NZ) thanks to the particle stimulated nucleation (PSN) mechanism and Zener pinning effect from ZrB₂ and Al₃(Er, Zr), which was in favor of alleviate welding hot cracking. The coarsen process of precipitates in the heat-affected zone (HAZ) was weaken. The coarse grain boundary precipitates were modified into fine precipitates with discrete distribution by ZrB₂ and Al₃(Er, Zr). The ultimate tensile strength and elongation of ZrB₂/7085Al-Er joint were 484 MPa and 14.8 %, which were enhanced by 36.3 % and 45.1 % compared with 7085Al joint. The joint efficiency reached up to 75.2 %. The strength-ductility synergy of ZrB₂/7085Al-Er joint came from grain refinement, avoidance of strain localization at grain boundary and activation of high density of intragranular dislocations brought by dispersive ZrB₂ and Al₃(Er, Zr).

{"title":"Microstructure evolution and strength-ductility synergy in friction stir welded ZrB2/7085Al-Er nanocomposite joints","authors":"Xu Gao, Xizhou Kai, Chengchao Du, Kelun Sun, Chuang Guan, Dingran Wang, Hanfei Zhu, Yutao Zhao","doi":"10.1016/j.msea.2024.147734","DOIUrl":"10.1016/j.msea.2024.147734","url":null,"abstract":"<div><div>Dispersed nanoparticles are expected to improve the weldability of 7085Al alloy for load-bearing structure of aerospace vehicles. In this work, Er elements were added to enable ZrB<sub>2</sub> nanoparticle dispersion through the modified interface and then the well-designed in-situ ZrB<sub>2</sub>/7085Al-Er nanocomposites were joined by friction stir welding (FSW). The results showed that the coherent (10 <span><math><mrow><mover><mn>1</mn><mo>‾</mo></mover></mrow></math></span> 0)<sub>ZrB2</sub>//(111)<sub>Al3Er</sub>//(111)<sub>Al</sub> interface constructed by primary Al<sub>3</sub>Er improved the interfacial wettability between ZrB<sub>2</sub> and Al, enabling the dispersion of ZrB<sub>2</sub> nanoparticle during solidification. After FSW, finer equiaxed recrystallized grains were formed in the nugget zone (NZ) thanks to the particle stimulated nucleation (PSN) mechanism and Zener pinning effect from ZrB<sub>2</sub> and Al<sub>3</sub>(Er, Zr), which was in favor of alleviate welding hot cracking. The coarsen process of precipitates in the heat-affected zone (HAZ) was weaken. The coarse grain boundary precipitates were modified into fine precipitates with discrete distribution by ZrB<sub>2</sub> and Al<sub>3</sub>(Er, Zr). The ultimate tensile strength and elongation of ZrB<sub>2</sub>/7085Al-Er joint were 484 MPa and 14.8 %, which were enhanced by 36.3 % and 45.1 % compared with 7085Al joint. The joint efficiency reached up to 75.2 %. The strength-ductility synergy of ZrB<sub>2</sub>/7085Al-Er joint came from grain refinement, avoidance of strain localization at grain boundary and activation of high density of intragranular dislocations brought by dispersive ZrB<sub>2</sub> and Al<sub>3</sub>(Er, Zr).</div></div>","PeriodicalId":385,"journal":{"name":"Materials Science and Engineering: A","volume":"923 ","pages":"Article 147734"},"PeriodicalIF":6.1,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143144356","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Improved surface integrity and fatigue property of FV520B steel via surface mechanical rolling treatment process

IF 6.1 2区材料科学 Q1 MATERIALS SCIENCE, MULTIDISCIPLINARY

Materials Science and Engineering: A

Pub Date : 2025-02-01 DOI: 10.1016/j.msea.2024.147708

Yongxin Zhou , Xingrong Chu , Jiao Sun , Rongwei Han , Xuemei Sun

In this paper, fatigue specimens prepared by the finish turning (FT) process were strengthened through surface mechanical rolling treatment (SMRT) process, and the effect of the SMRT process on the surface integrity and fatigue life of FV520B steel was investigated. The SMRT process significantly improves surface integrity, including surface roughness, microhardness, residual stress and gradient microstructure surface (GMS) layer. The fatigue life first increases and then decreases sharply with increasing pressure, while the fatigue life decreases slightly with increasing feed rate. Compared to FT specimen, the highest fatigue life was improved by 14.12 times after SMRT process. The fatigue fracture of FT specimen presents a continuous fatigue crack initiation site, while the fatigue fracture of SMRT specimens contains multi-point fatigue crack initiation sites or a single fatigue crack initiation site. In addition, the microstructure evolution mechanism of the SMRT specimens was analyzed. At the pressure of 18 MPa, EBSD results showed that the grain orientation was uniformly distributed, and the dislocation density and the number of grain boundaries were significantly increased on the surface. Meanwhile, TEM proves that a gradient nanostructured surface (GNS) layer was prepared, with an equiaxed nanocrystalline size of the topmost surface measuring approximately 34.9 nm. The improvement of fatigue life mainly relies on the synergistic effects of smooth surface, residual compressive stress and GNS layer after SMRT process.

{"title":"Improved surface integrity and fatigue property of FV520B steel via surface mechanical rolling treatment process","authors":"Yongxin Zhou , Xingrong Chu , Jiao Sun , Rongwei Han , Xuemei Sun","doi":"10.1016/j.msea.2024.147708","DOIUrl":"10.1016/j.msea.2024.147708","url":null,"abstract":"<div><div>In this paper, fatigue specimens prepared by the finish turning (FT) process were strengthened through surface mechanical rolling treatment (SMRT) process, and the effect of the SMRT process on the surface integrity and fatigue life of FV520B steel was investigated. The SMRT process significantly improves surface integrity, including surface roughness, microhardness, residual stress and gradient microstructure surface (GMS) layer. The fatigue life first increases and then decreases sharply with increasing pressure, while the fatigue life decreases slightly with increasing feed rate. Compared to FT specimen, the highest fatigue life was improved by 14.12 times after SMRT process. The fatigue fracture of FT specimen presents a continuous fatigue crack initiation site, while the fatigue fracture of SMRT specimens contains multi-point fatigue crack initiation sites or a single fatigue crack initiation site. In addition, the microstructure evolution mechanism of the SMRT specimens was analyzed. At the pressure of 18 MPa, EBSD results showed that the grain orientation was uniformly distributed, and the dislocation density and the number of grain boundaries were significantly increased on the surface. Meanwhile, TEM proves that a gradient nanostructured surface (GNS) layer was prepared, with an equiaxed nanocrystalline size of the topmost surface measuring approximately 34.9 nm. The improvement of fatigue life mainly relies on the synergistic effects of smooth surface, residual compressive stress and GNS layer after SMRT process.</div></div>","PeriodicalId":385,"journal":{"name":"Materials Science and Engineering: A","volume":"923 ","pages":"Article 147708"},"PeriodicalIF":6.1,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143144742","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Evolution of microstructure and property alterations in Cu-Ag-Cr alloy under rolling deformation

IF 6.1 2区材料科学 Q1 MATERIALS SCIENCE, MULTIDISCIPLINARY

Materials Science and Engineering: A

Pub Date : 2025-02-01 DOI: 10.1016/j.msea.2024.147768

Xiao Guo , Lin Zhang , Yupeng Zhang , Daoqi Zhang , Xue Zhao , Engang Wang

The mechanical strength of Cu-Ag alloys can be enhanced while preserving their electrical conductivity through the addition of a third alloying element and deformation processing. This study examines the microstructural evolution of Cu-Ag and Cu-Ag-Cr alloys following cold rolling, quantifying the effects of grain boundaries, dislocations, solid solutions, and Ag precipitates on strengthening mechanisms, as well as describing the alloy's conductive behavior. The incorporation of Cr alters the precipitation behavior in Cu-Ag, promoting a predominantly continuous Ag precipitate phase. Cr addition results in a significant improvement in mechanical properties, leading to an increase in strength by approximately 140–160 MPa compared to Cr-free Cu-Ag alloys. The difference in strength between the two alloys is primarily attributed to variations in the evolution of precipitate phases at different levels of deformation, driven by a combination of dislocation and precipitation strengthening mechanisms. The reduction in electrical conductivity is mainly attributed to enhanced interfacial scattering following rolling deformation.

{"title":"Evolution of microstructure and property alterations in Cu-Ag-Cr alloy under rolling deformation","authors":"Xiao Guo , Lin Zhang , Yupeng Zhang , Daoqi Zhang , Xue Zhao , Engang Wang","doi":"10.1016/j.msea.2024.147768","DOIUrl":"10.1016/j.msea.2024.147768","url":null,"abstract":"<div><div>The mechanical strength of Cu-Ag alloys can be enhanced while preserving their electrical conductivity through the addition of a third alloying element and deformation processing. This study examines the microstructural evolution of Cu-Ag and Cu-Ag-Cr alloys following cold rolling, quantifying the effects of grain boundaries, dislocations, solid solutions, and Ag precipitates on strengthening mechanisms, as well as describing the alloy's conductive behavior. The incorporation of Cr alters the precipitation behavior in Cu-Ag, promoting a predominantly continuous Ag precipitate phase. Cr addition results in a significant improvement in mechanical properties, leading to an increase in strength by approximately 140–160 MPa compared to Cr-free Cu-Ag alloys. The difference in strength between the two alloys is primarily attributed to variations in the evolution of precipitate phases at different levels of deformation, driven by a combination of dislocation and precipitation strengthening mechanisms. The reduction in electrical conductivity is mainly attributed to enhanced interfacial scattering following rolling deformation.</div></div>","PeriodicalId":385,"journal":{"name":"Materials Science and Engineering: A","volume":"924 ","pages":"Article 147768"},"PeriodicalIF":6.1,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143167477","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Evaluation of fatigue crack growth rates and fracture toughness in a selective laser-melted Ti-5.6Al-3.8V alloy with optimized microstructure after heat treatment

IF 6.1 2区材料科学 Q1 MATERIALS SCIENCE, MULTIDISCIPLINARY

Materials Science and Engineering: A

Pub Date : 2025-02-01 DOI: 10.1016/j.msea.2025.147822

Yuqi He , Kexin Zhao , Ying Zhang , Konda Gokuldoss Prashanth , Zimeng Ye , Zerong Yu , Fengying Zhang

Selective Laser Melting (SLM) has emerged as a promising additive manufacturing technology for fabricating intricate titanium alloy components, drawing significant attention to the comprehensive mechanical properties of the resulting alloys. This work investigates the fatigue crack propagation and fracture behavior of the SLM Ti-5.6Al-3.8V alloy. The fatigue crack growth rate and fracture toughness of this alloy were further analyzed, which are comparable to those of the forged Ti-6Al-4V alloy and surpass those reported for other SLM Ti-6Al-4V alloys. Combining the characterization of the fracture morphology and microstructural characteristics, it was found that the microstructure of fine "β columnar grains + α laths" promotes the formation of jagged α cracks and crack deflection during the macroscopic and smooth propagation of fatigue cracks, thereby helping to delay cracks. Additionally, the influence of the microstructure on crack propagation in this alloy is evident in the deformed α-laths and the distribution of micropores to varying degrees formed during plastic deformation. These phenomena help to eliminate the stress concentration at the crack tip, thereby hindering the rapid fracture after the crack instability propagation. Furthermore, X-ray diffraction (XRD) detected αʺ phase diffraction peaks in both as-deposited and heat-treated SLM Ti-5.6Al-3.8V alloy samples, which disappeared after test, indicating martensite phase transformation during fatigue crack propagation and fracture processes. These findings underscore the exceptional mechanical properties of SLM Ti-5.6Al-3.8V alloy and highlight the significance of microstructural features and martensite phase transformation in influencing fatigue crack propagation and fracture behavior. This work contributes to a deeper understanding of the mechanical properties of SLM titanium alloy and provides insights for optimizing properties for various engineering applications.

{"title":"Evaluation of fatigue crack growth rates and fracture toughness in a selective laser-melted Ti-5.6Al-3.8V alloy with optimized microstructure after heat treatment","authors":"Yuqi He , Kexin Zhao , Ying Zhang , Konda Gokuldoss Prashanth , Zimeng Ye , Zerong Yu , Fengying Zhang","doi":"10.1016/j.msea.2025.147822","DOIUrl":"10.1016/j.msea.2025.147822","url":null,"abstract":"<div><div>Selective Laser Melting (SLM) has emerged as a promising additive manufacturing technology for fabricating intricate titanium alloy components, drawing significant attention to the comprehensive mechanical properties of the resulting alloys. This work investigates the fatigue crack propagation and fracture behavior of the SLM Ti-5.6Al-3.8V alloy. The fatigue crack growth rate and fracture toughness of this alloy were further analyzed, which are comparable to those of the forged Ti-6Al-4V alloy and surpass those reported for other SLM Ti-6Al-4V alloys. Combining the characterization of the fracture morphology and microstructural characteristics, it was found that the microstructure of fine \"β columnar grains + α laths\" promotes the formation of jagged α cracks and crack deflection during the macroscopic and smooth propagation of fatigue cracks, thereby helping to delay cracks. Additionally, the influence of the microstructure on crack propagation in this alloy is evident in the deformed α-laths and the distribution of micropores to varying degrees formed during plastic deformation. These phenomena help to eliminate the stress concentration at the crack tip, thereby hindering the rapid fracture after the crack instability propagation. Furthermore, X-ray diffraction (XRD) detected αʺ phase diffraction peaks in both as-deposited and heat-treated SLM Ti-5.6Al-3.8V alloy samples, which disappeared after test, indicating martensite phase transformation during fatigue crack propagation and fracture processes. These findings underscore the exceptional mechanical properties of SLM Ti-5.6Al-3.8V alloy and highlight the significance of microstructural features and martensite phase transformation in influencing fatigue crack propagation and fracture behavior. This work contributes to a deeper understanding of the mechanical properties of SLM titanium alloy and provides insights for optimizing properties for various engineering applications.</div></div>","PeriodicalId":385,"journal":{"name":"Materials Science and Engineering: A","volume":"924 ","pages":"Article 147822"},"PeriodicalIF":6.1,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143167790","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Strengthening mechanisms in Ni and Ni-5Fe alloy

IF 6.1 2区材料科学 Q1 MATERIALS SCIENCE, MULTIDISCIPLINARY

Materials Science and Engineering: A

Pub Date : 2025-02-01 DOI: 10.1016/j.msea.2024.147752

Shavi Agrawal , Martin Heilmaier , Werner Skrotzki , Satyam Suwas

Two model systems (pure Ni and Ni-5%Fe) with five different grain sizes varying from submicrons to micrometers were investigated for the evaluative contribution of various strengthening mechanisms operative in both polycrystalline materials at room temperature. The various strengthening mechanisms contributing to the overall yield stress were calculated individually. A good linear fit of the Hall-Petch relationship was attained by (i) subtracting the dislocation strengthening contribution from the experimental yield stress and (ii) considering the dislocation interaction factor α as a microstructural parameter in the Taylor equation taking into account the dislocation arrangement in the material. α decreases with increasing heterogeneity of the dislocation arrangement. Incorporating the above-mentioned assumptions while fitting the Hall-Petch plot within a wide range of grain sizes reduced the ambiguity of obtaining different Hall-Petch constants (

k_{H P}

) for the alloys under investigation. As a consequence, a consistent value of

k_{H P}

∼0.15 MPa

\sqrt{m}

was obtained for both Ni and Ni-5%Fe. Solid solution strengthening obtained from Hall-Petch fitting (

σ_{s s}

∼21.3 MPa) was corroborated with the calculated values from Labusch's model of solid solution strengthening (

σ_{s s}

∼12 MPa for screw and ∼106 MPa for edge type dislocations, respectively). The good agreement with the modelled lower bound value of

σ_{s s}

was attributed to the presence of dislocations with mainly screw character in the experiment.

{"title":"Strengthening mechanisms in Ni and Ni-5Fe alloy","authors":"Shavi Agrawal , Martin Heilmaier , Werner Skrotzki , Satyam Suwas","doi":"10.1016/j.msea.2024.147752","DOIUrl":"10.1016/j.msea.2024.147752","url":null,"abstract":"<div><div>Two model systems (pure Ni and Ni-5%Fe) with five different grain sizes varying from submicrons to micrometers were investigated for the evaluative contribution of various strengthening mechanisms operative in both polycrystalline materials at room temperature. The various strengthening mechanisms contributing to the overall yield stress were calculated individually. A good linear fit of the Hall-Petch relationship was attained by (i) subtracting the dislocation strengthening contribution from the experimental yield stress and (ii) considering the dislocation interaction factor α as a microstructural parameter in the Taylor equation taking into account the dislocation arrangement in the material. α decreases with increasing heterogeneity of the dislocation arrangement. Incorporating the above-mentioned assumptions while fitting the Hall-Petch plot within a wide range of grain sizes reduced the ambiguity of obtaining different Hall-Petch constants (<span><math><mrow><msub><mi>k</mi><mrow><mi>H</mi><mi>P</mi></mrow></msub></mrow></math></span>) for the alloys under investigation. As a consequence, a consistent value of <span><math><mrow><msub><mi>k</mi><mrow><mi>H</mi><mi>P</mi></mrow></msub></mrow></math></span> ∼0.15 MPa <span><math><mrow><msqrt><mi>m</mi></msqrt></mrow></math></span> was obtained for both Ni and Ni-5%Fe. Solid solution strengthening obtained from Hall-Petch fitting (<span><math><mrow><msub><mi>σ</mi><mrow><mi>s</mi><mi>s</mi></mrow></msub></mrow></math></span> ∼21.3 MPa) was corroborated with the calculated values from Labusch's model of solid solution strengthening (<span><math><mrow><msub><mi>σ</mi><mrow><mi>s</mi><mi>s</mi></mrow></msub></mrow></math></span> ∼12 MPa for screw and ∼106 MPa for edge type dislocations, respectively). The good agreement with the modelled lower bound value of <span><math><mrow><msub><mi>σ</mi><mrow><mi>s</mi><mi>s</mi></mrow></msub></mrow></math></span> was attributed to the presence of dislocations with mainly screw character in the experiment.</div></div>","PeriodicalId":385,"journal":{"name":"Materials Science and Engineering: A","volume":"924 ","pages":"Article 147752"},"PeriodicalIF":6.1,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143167799","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Additively manufactured Inconel 718 plus superalloy with heterostructures and high mechanical properties

IF 6.1 2区材料科学 Q1 MATERIALS SCIENCE, MULTIDISCIPLINARY

Materials Science and Engineering: A

Pub Date : 2025-02-01 DOI: 10.1016/j.msea.2024.147683

Hang Lin , Changlv Dai , Wenzheng Zhai , Gang Zhao , Youheng Fu , Runsheng Li , Jianwu Huang , Mingbo Zhang , Li Zeng , Mingxin Liu , Mingtian Wang , Guilang Wang , Haiou Zhang

Wire-arc directed energy deposition (DED-arc) is a promising method to efficiently build large complex parts. However, columnar-grained structures commonly exist in DED-arc parts which exhibit anisotropic properties. In this study, the morphologies, microstructures, and mechanical properties of Inconel 718 plus superalloys fabricated by hybrid DED-arc with micro-rolling (HDMR) are investigated. Simulation and experimental results show that increasing the rolling force flattens the weld bead and significantly enhances the aspect ratio. Additionally, our simulations reveal that as the rolling force increases, there is a corresponding rise in equivalent plastic strain while longitudinal residual tensile stress decreases; intriguingly, residual compressive stress may even emerge. The HDMR process alters the morphology of the brittle Laves phase with a reduced content. Notably, a heterostructure characterized by alternating fragmented columnar (average size of 64.4 μm) and equiaxed fine grains (average size of 49.9 μm) is observed at a 30 kN rolling force, which can weaken the texture strength and enhanced dislocation density of the sample. In summary, in-situ rolling shows great potential in enhancing both tensile and yield strength while significantly minimizing the anisotropy of built samples. To validate these findings, an Inconel 718 plus superalloy combustion chamber is built utilizing the HDMR method.

{"title":"Additively manufactured Inconel 718 plus superalloy with heterostructures and high mechanical properties","authors":"Hang Lin , Changlv Dai , Wenzheng Zhai , Gang Zhao , Youheng Fu , Runsheng Li , Jianwu Huang , Mingbo Zhang , Li Zeng , Mingxin Liu , Mingtian Wang , Guilang Wang , Haiou Zhang","doi":"10.1016/j.msea.2024.147683","DOIUrl":"10.1016/j.msea.2024.147683","url":null,"abstract":"<div><div>Wire-arc directed energy deposition (DED-arc) is a promising method to efficiently build large complex parts. However, columnar-grained structures commonly exist in DED-arc parts which exhibit anisotropic properties. In this study, the morphologies, microstructures, and mechanical properties of Inconel 718 plus superalloys fabricated by hybrid DED-arc with micro-rolling (HDMR) are investigated. Simulation and experimental results show that increasing the rolling force flattens the weld bead and significantly enhances the aspect ratio. Additionally, our simulations reveal that as the rolling force increases, there is a corresponding rise in equivalent plastic strain while longitudinal residual tensile stress decreases; intriguingly, residual compressive stress may even emerge. The HDMR process alters the morphology of the brittle Laves phase with a reduced content. Notably, a heterostructure characterized by alternating fragmented columnar (average size of 64.4 μm) and equiaxed fine grains (average size of 49.9 μm) is observed at a 30 kN rolling force, which can weaken the texture strength and enhanced dislocation density of the sample. In summary, in-situ rolling shows great potential in enhancing both tensile and yield strength while significantly minimizing the anisotropy of built samples. To validate these findings, an Inconel 718 plus superalloy combustion chamber is built utilizing the HDMR method.</div></div>","PeriodicalId":385,"journal":{"name":"Materials Science and Engineering: A","volume":"924 ","pages":"Article 147683"},"PeriodicalIF":6.1,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143167935","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Overcoming the strength-ductility trade-off in additively manufactured super austenitic stainless steel matrix composites via grain boundary engineering and heterogeneous structures

IF 6.1 2区材料科学 Q1 MATERIALS SCIENCE, MULTIDISCIPLINARY

Materials Science and Engineering: A

Pub Date : 2025-02-01 DOI: 10.1016/j.msea.2025.147799

Yongjian Fang, Yali Zhang, Ziyang Duan, Quan Yuan, Huiying Jin, Jonghwan Suhr

The development of high-strength metals is vital for various industrial applications, but avoiding a reduction in their ductility remains a challenge. In this study, an innovative combination of grain boundary engineering and multiple heterogeneous structures was proposed to significantly enhance the strength-ductility synergy of metals using laser powder bed fusion (LPBF) technique, and a novel super austenitic stainless steel (SASS) matrix composite with significantly enhanced strength-ductility synergy was demonstrated. Compared to as-built SASSs, the ultimate tensile strength of as-built novel SASS matrix composites was increased by ∼22.4 %, and their uniform elongation was also increased by ∼10.8 %. By utilizing in-situ formed TiC_xN_y nanoparticles induced by micron-sized TiC particles and introducing 2507 super duplex stainless steels (SDSSs) to manipulate the stacking fault energy of AL-6XN SASSs, bimodal austenite grains were created. Substantial Σ3 twin boundaries and some nanotwins were generated, and fine duplex grains were produced in some areas. Significantly enhanced strain hardening rate was obtained in as-built novel SASS matrix composites, which was mainly attributed to the production of bimodal grains, duplex grains, nanotwins, nanoparticles, and Σ3 twin boundaries. The novel strategy developed in this study provides an efficient solution for developing metals with exceptional strength-ductility synergy.

{"title":"Overcoming the strength-ductility trade-off in additively manufactured super austenitic stainless steel matrix composites via grain boundary engineering and heterogeneous structures","authors":"Yongjian Fang, Yali Zhang, Ziyang Duan, Quan Yuan, Huiying Jin, Jonghwan Suhr","doi":"10.1016/j.msea.2025.147799","DOIUrl":"10.1016/j.msea.2025.147799","url":null,"abstract":"<div><div>The development of high-strength metals is vital for various industrial applications, but avoiding a reduction in their ductility remains a challenge. In this study, an innovative combination of grain boundary engineering and multiple heterogeneous structures was proposed to significantly enhance the strength-ductility synergy of metals using laser powder bed fusion (LPBF) technique, and a novel super austenitic stainless steel (SASS) matrix composite with significantly enhanced strength-ductility synergy was demonstrated. Compared to as-built SASSs, the ultimate tensile strength of as-built novel SASS matrix composites was increased by ∼22.4 %, and their uniform elongation was also increased by ∼10.8 %. By utilizing in-situ formed TiC<sub>x</sub>N<sub>y</sub> nanoparticles induced by micron-sized TiC particles and introducing 2507 super duplex stainless steels (SDSSs) to manipulate the stacking fault energy of AL-6XN SASSs, bimodal austenite grains were created. Substantial Σ3 twin boundaries and some nanotwins were generated, and fine duplex grains were produced in some areas. Significantly enhanced strain hardening rate was obtained in as-built novel SASS matrix composites, which was mainly attributed to the production of bimodal grains, duplex grains, nanotwins, nanoparticles, and Σ3 twin boundaries. The novel strategy developed in this study provides an efficient solution for developing metals with exceptional strength-ductility synergy.</div></div>","PeriodicalId":385,"journal":{"name":"Materials Science and Engineering: A","volume":"924 ","pages":"Article 147799"},"PeriodicalIF":6.1,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143167940","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Comparison of gaseous hydrogen effects in 1200 MPa high strength martensitic and pearlitic steels

IF 6.1 2区材料科学 Q1 MATERIALS SCIENCE, MULTIDISCIPLINARY

Materials Science and Engineering: A

Pub Date : 2025-02-01 DOI: 10.1016/j.msea.2025.147875

Thorsten Michler , Lisa Claeys , Sabine Oeser , Tom Depover

This study compares gaseous hydrogen effects in a high strength martensitic and pearlitic steel (ultimate tensile strength of 1200–1300 MPa). When tensile tested in 10 MPa gaseous hydrogen at room temperature, the relative reduction of area (RRA) is 14 % for the martensitic steel while the pearlitic steel shows much improved behaviour with an RRA of 75 %. The microstructures of both steels are characterized in detail pre- and post-mortem. Fractography reveals that hydrogen assisted fracture occurs predominantly along prior austenite grain boundaries for the martensitic steel while tearing topography surface characteristics are observed for the pearlitic steel. Thermal desorption spectroscopy measurements show similar total hydrogen contents of about 2 wppm in both microstructures. In the martensitic microstructure, hydrogen is weakly trapped, whereas in the pearlitic microstructure, about 30 % of the hydrogen is strongly trapped. This seems to be one important reason for the higher RRA of the pearlitic microstructure in 10 MPa gaseous hydrogen.

引用次数: 0

Effects of annealing temperature on cellular structure and mechanical properties of additively manufactured 304L stainless steel by directed energy deposition

IF 6.1 2区材料科学 Q1 MATERIALS SCIENCE, MULTIDISCIPLINARY

Materials Science and Engineering: A

Pub Date : 2025-02-01 DOI: 10.1016/j.msea.2025.147821

Jung-Min Kim , Young-Bum Chun , Suk Hoon Kang , Bong Sang Lee

The mechanical properties of additively manufactured 304L stainless steel are strongly influenced by cellular structures, which include high dislocation densities, low-angle grain boundaries, and elemental segregation. To investigate the impact of these features on material strength, the as-built 304L stainless steel was subjected to annealing treatments at temperatures ranging from 750 °C to 1150 °C. The microstructural changes within the cellular structures after annealing were analyzed using electron microscopy techniques. The contributions of each microstructural feature to the yield strength were quantitatively assessed and compared with the yield strengths obtained from tensile testing. It demonstrates that elemental segregation and dislocation density on the cellular structures are the dominant factors governing the high yield strength of additively manufactured 304L stainless steel. In addition, it was confirmed that elemental segregation in the cellular structure can affect the martensitic transformation under tensile deformation, which may affect the strain induced plasticity (TRIP) effect.

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引用次数: 0

Mechanism of microstructure and properties evolution of 2195 Al-Li alloy during radial-direction hot compression and heat treatment: Determined by shape, size and rotation of grains

IF 6.1 2区材料科学 Q1 MATERIALS SCIENCE, MULTIDISCIPLINARY

Materials Science and Engineering: A

Pub Date : 2025-02-01 DOI: 10.1016/j.msea.2024.147781

Qiwei Wang , Bin Shao , Lipeng Qiu , Debin Shan , Yingying Zong

Extruded bars are one of the important hot forming raw materials for Al-Li alloy. They typically exhibits strong textures and anisotropy, which significantly affect the subsequent hot deformation microstructure and properties. Thus, this study investigates the radial-direction (RD) hot compression of a 2195 Al-Li alloy extruded bar, the mechanical properties and corresponding microstructure evolution mechanisms along the axial (AD) and circumferential (CD) directions of the original bar are analyzed. The results revealed a <111>//AD texture in the original bar, with significant anisotropy observed in the T6-state (solution, quenching and artificial peak aging) bar. After compression and T6-treated, the yield and tensile strengths along the AD generally decreased, while along the CD first increased then decreased, and the strength anisotropy is significantly reduced. However, anisotropy in elongation persisted, with the elongation along the CD significantly lower than that along the AD. This is mainly attributed to the grains with high-angle grain boundaries maintained an elongated shape along the AD. In addition, smaller grain size and higher HAGB proportion result in lower elongation along the CD. The change in yield strength showed a notable positive correlation with the peak intensity of the texture near <111>. A grain rotation model that determines the evolution of texture was established. During compression, the <111>//AD grains firstly rotate around the AD to reach the <110>//RD, then alternately and cyclically slip on two different {111} planes as the Schmidt factor changes, ultimately causing the grains to rotate around the RD.

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