Materials Science and Engineering: A最新文献

英文中文

Laser powder bed fusion of TiN - high nitrogen steel composite: Microstructure and strengthening mechanism

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.2024.147595

Jiazhe Fu , Jie Liu , Jiahao Liu , Yaochun Zhou , Liang Fu , Linhai Fan , Yanwen Liang , Lixin Wang , Ying Xing , Kehong Wang

High nitrogen steel (HNS) produced by laser powder bed fusion (LPBF) has relatively excellent strength, but its ductility is poor. HNS + TiN is obtained by coating the HNS powder with the second phase, on the basis of which the changes in the microstructure of HNS + TiN formed via LPBF and the effects of the addition of the second phase on the mechanical property of HNS are systematically analyzed and the strengthening mechanism of HNS matrix composites is further elaborated. The microstructure of the samples formed via LPBF, HNS and HNS + TiN, are mainly composed of δ - ferrite and γ - austenite. The microstructures are characterized by changes in γ - austenite phase content, the average grain size after the addition of TiN, and the mechanical properties show changes, especially in ductility, with the elongation of the HNS + TiN sample reaching up to 16.25 %. and the average elongation is 3.3 times higher than that of HNS. The strengthening mechanism of the HNS + TiN is analyzed using EBSD, TEM and other characterization methods, the results show that Mn₂TiO₄ precipitates first at the grain boundaries and intracrystalline in the HNS + TiN, which plays a role in the second phase of solidification and grain refinement, and then the TiN is precipitated along the boundaries of Mn₂TiO₄. This study provides a new perspective to understand the relationship between microstructure and the mechanical properties of the HNS + TiN composite formed by LPBF, and provides a reference for the selection and application in LPBF in the future.

{"title":"Laser powder bed fusion of TiN - high nitrogen steel composite: Microstructure and strengthening mechanism","authors":"Jiazhe Fu , Jie Liu , Jiahao Liu , Yaochun Zhou , Liang Fu , Linhai Fan , Yanwen Liang , Lixin Wang , Ying Xing , Kehong Wang","doi":"10.1016/j.msea.2024.147595","DOIUrl":"10.1016/j.msea.2024.147595","url":null,"abstract":"<div><div>High nitrogen steel (HNS) produced by laser powder bed fusion (LPBF) has relatively excellent strength, but its ductility is poor. HNS + TiN is obtained by coating the HNS powder with the second phase, on the basis of which the changes in the microstructure of HNS + TiN formed via LPBF and the effects of the addition of the second phase on the mechanical property of HNS are systematically analyzed and the strengthening mechanism of HNS matrix composites is further elaborated. The microstructure of the samples formed via LPBF, HNS and HNS + TiN, are mainly composed of δ - ferrite and γ - austenite. The microstructures are characterized by changes in γ - austenite phase content, the average grain size after the addition of TiN, and the mechanical properties show changes, especially in ductility, with the elongation of the HNS + TiN sample reaching up to 16.25 %. and the average elongation is 3.3 times higher than that of HNS. The strengthening mechanism of the HNS + TiN is analyzed using EBSD, TEM and other characterization methods, the results show that Mn<sub>2</sub>TiO<sub>4</sub> precipitates first at the grain boundaries and intracrystalline in the HNS + TiN, which plays a role in the second phase of solidification and grain refinement, and then the TiN is precipitated along the boundaries of Mn<sub>2</sub>TiO<sub>4</sub>. This study provides a new perspective to understand the relationship between microstructure and the mechanical properties of the HNS + TiN composite formed by LPBF, and provides a reference for the selection and application in LPBF in the future.</div></div>","PeriodicalId":385,"journal":{"name":"Materials Science and Engineering: A","volume":"922 ","pages":"Article 147595"},"PeriodicalIF":6.1,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143103264","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

Creep anisotropy of a low-cost third generation single crystal superalloy at 760 °C and 1120 °C

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.2024.147632

Q.Y. Guan , Y.M. Li , X.G. Wang , Z.K. Chu , Z.H. Tan , Z.Y. Liang , X.P. Tao , Y.H. Yang , J.L. Liu , J.D. Liu , C.H. Zhang , S. Zhang , J.G. Li , Y.Z. Zhou , X.F. Sun

This research investigated the anisotropy of creep properties of a low-cost third-generation Nickel-based single crystal superalloy under two conditions of 760 °C/800 MPa and 1120 °C/137 MPa. The microstructures and deformation mechanisms of the [011] and [111]-oriented specimens were studied in depth and the determinants of anisotropy were analyzed. The low critical resolved shearing stress and the single activation of the <112> {111} slip system synergistically led to the formation of tremendous continuous stacking faults in the [011]-oriented specimen, which resulted in its extremely poor creep life under condition of intermediate temperature and high stress. In contrast, high critical resolved shearing stress of <112> {111} slip systems led to the formation of a large number of microtwins in the [111]-oriented specimen. The microtwins dispersed in the γʹ phase could well hinder the movement of dislocations and produce a favorable work-hardening effect, which led to the excellent creep life of the [111]-oriented specimens under condition of intermediate temperature and high stress. Under the condition of high temperature and low stress, the deformation mechanism was transformed to the dislocations slipping on the <110> {111} slip system and climbing. At this point, the anisotropy of the two oriented specimens was significantly weakened. Importantly, the creep behavior was compared with that of other SX superalloys, a specific reason for the anisotropy under the condition of intermediate temperature and high stress was proposed. That was [111]-oriented specimens exhibited significant orientation sensitive to forming microtwins, which induced the different creep anisotropy in this low-cost [111]-oriented Nickel-based single crystal alloy.

{"title":"Creep anisotropy of a low-cost third generation single crystal superalloy at 760 °C and 1120 °C","authors":"Q.Y. Guan , Y.M. Li , X.G. Wang , Z.K. Chu , Z.H. Tan , Z.Y. Liang , X.P. Tao , Y.H. Yang , J.L. Liu , J.D. Liu , C.H. Zhang , S. Zhang , J.G. Li , Y.Z. Zhou , X.F. Sun","doi":"10.1016/j.msea.2024.147632","DOIUrl":"10.1016/j.msea.2024.147632","url":null,"abstract":"<div><div>This research investigated the anisotropy of creep properties of a low-cost third-generation Nickel-based single crystal superalloy under two conditions of 760 °C/800 MPa and 1120 °C/137 MPa. The microstructures and deformation mechanisms of the [011] and [111]-oriented specimens were studied in depth and the determinants of anisotropy were analyzed. The low critical resolved shearing stress and the single activation of the <112> {111} slip system synergistically led to the formation of tremendous continuous stacking faults in the [011]-oriented specimen, which resulted in its extremely poor creep life under condition of intermediate temperature and high stress. In contrast, high critical resolved shearing stress of <112> {111} slip systems led to the formation of a large number of microtwins in the [111]-oriented specimen. The microtwins dispersed in the γʹ phase could well hinder the movement of dislocations and produce a favorable work-hardening effect, which led to the excellent creep life of the [111]-oriented specimens under condition of intermediate temperature and high stress. Under the condition of high temperature and low stress, the deformation mechanism was transformed to the dislocations slipping on the <110> {111} slip system and climbing. At this point, the anisotropy of the two oriented specimens was significantly weakened. Importantly, the creep behavior was compared with that of other SX superalloys, a specific reason for the anisotropy under the condition of intermediate temperature and high stress was proposed. That was [111]-oriented specimens exhibited significant orientation sensitive to forming microtwins, which induced the different creep anisotropy in this low-cost [111]-oriented Nickel-based single crystal alloy.</div></div>","PeriodicalId":385,"journal":{"name":"Materials Science and Engineering: A","volume":"922 ","pages":"Article 147632"},"PeriodicalIF":6.1,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143103302","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

Plastic deformation and fracture behavior of dilute Mg-Al-Ca-Mn alloys with bimodal grain structure

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.2024.147624

Z.L. Wu , T. Nakata , C. Xu , G.Z. Tang , X.J. Wang , K.K. Deng , G.S. Wang , S. Kamado , L. Geng

Deformation and fracture behavior of the Mg-1Al-0.2Ca-0.7Mn (wt.%) alloy with a bimodal grain structure were investigated by varying the proportions of recrystallized (RXed) grains. Three samples were prepared with varying proportions of RXed grains at 40 % (F40), 52 % (F50), and 66 % (F65), respectively. The strain distribution among different grains was visualized using the Digital Image Correlation (DIC) technique, and X-ray Computed Tomography (CT) was utilized to observe crack distribution. The results indicate that the sample with 66 % RXed grains demonstrated a favorable strength-ductility balance compared to the other two samples. This can be attributed to its superior capacity for strain transfer and expansion. Among them, the RXed grains promoted strain transmission and inhibited crack propagation, while the unRXed grains assisted in localized strain release and strengthened the alloy. This could enhance understanding of the strength-ductility mechanism in bimodal grain structures.

{"title":"Plastic deformation and fracture behavior of dilute Mg-Al-Ca-Mn alloys with bimodal grain structure","authors":"Z.L. Wu , T. Nakata , C. Xu , G.Z. Tang , X.J. Wang , K.K. Deng , G.S. Wang , S. Kamado , L. Geng","doi":"10.1016/j.msea.2024.147624","DOIUrl":"10.1016/j.msea.2024.147624","url":null,"abstract":"<div><div>Deformation and fracture behavior of the Mg-1Al-0.2Ca-0.7Mn (wt.%) alloy with a bimodal grain structure were investigated by varying the proportions of recrystallized (RXed) grains. Three samples were prepared with varying proportions of RXed grains at 40 % (F40), 52 % (F50), and 66 % (F65), respectively. The strain distribution among different grains was visualized using the Digital Image Correlation (DIC) technique, and X-ray Computed Tomography (CT) was utilized to observe crack distribution. The results indicate that the sample with 66 % RXed grains demonstrated a favorable strength-ductility balance compared to the other two samples. This can be attributed to its superior capacity for strain transfer and expansion. Among them, the RXed grains promoted strain transmission and inhibited crack propagation, while the unRXed grains assisted in localized strain release and strengthened the alloy. This could enhance understanding of the strength-ductility mechanism in bimodal grain structures.</div></div>","PeriodicalId":385,"journal":{"name":"Materials Science and Engineering: A","volume":"922 ","pages":"Article 147624"},"PeriodicalIF":6.1,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143103358","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

Design and preparation of Ti-6Al-1.7Fe-0.1Si-7.3Cr alloy with excellent tensile 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.2024.147635

Chun Liu , Yunwu Tang , Anhui Cai , Chaoyi Ding , Wenhao Li , Yanpeng Yuan , Aiyang Wang , Weixin Guo , Xiaoru Yan , Lixin Gao

A novel Ti-6Al-1.7Fe-0.1Si-7.3Cr alloy was designed using high-throughput diffusion couple technique. The heat treatment effects on the microstructure and tensile properties of the designed alloy was investigated. The results indicated that the alloys after solution treatment at 800 °C/840 °C and aging at 400 °C/470 °C exhibited high strength (>1200 MPa) and good ductility (>5 %) due to the synergy of spherical α_p phase, coarse flake α_p phase and acicular α_s phase in the β matrix. The precipitation of TiCr₂ Laves phase at aging temperatures above 540 °C led to a decline in ductility. The absence of the spherical α_p phase for the alloy after solution treatmen at 920 °C also resulted in the deterioration of aging elongation. Good balances of strength and ductility were achieved for the alloys after solution treatment at 840 °C and aging at 400 °C/470 °C, with the ultimate tensile strength and tensile elongation of 1237 MPa/23.3 % and 1753 MPa/5.1 %, respectively. Furthermore, the deformation mechanism of the alloys was analyzed, and dislocation slip in α_p phase and β grain was demonstrated to be the main plastic deformation mode.

{"title":"Design and preparation of Ti-6Al-1.7Fe-0.1Si-7.3Cr alloy with excellent tensile properties","authors":"Chun Liu , Yunwu Tang , Anhui Cai , Chaoyi Ding , Wenhao Li , Yanpeng Yuan , Aiyang Wang , Weixin Guo , Xiaoru Yan , Lixin Gao","doi":"10.1016/j.msea.2024.147635","DOIUrl":"10.1016/j.msea.2024.147635","url":null,"abstract":"<div><div>A novel Ti-6Al-1.7Fe-0.1Si-7.3Cr alloy was designed using high-throughput diffusion couple technique. The heat treatment effects on the microstructure and tensile properties of the designed alloy was investigated. The results indicated that the alloys after solution treatment at 800 °C/840 °C and aging at 400 °C/470 °C exhibited high strength (>1200 MPa) and good ductility (>5 %) due to the synergy of spherical α<sub>p</sub> phase, coarse flake α<sub>p</sub> phase and acicular α<sub>s</sub> phase in the β matrix. The precipitation of TiCr<sub>2</sub> Laves phase at aging temperatures above 540 °C led to a decline in ductility. The absence of the spherical α<sub>p</sub> phase for the alloy after solution treatmen at 920 °C also resulted in the deterioration of aging elongation. Good balances of strength and ductility were achieved for the alloys after solution treatment at 840 °C and aging at 400 °C/470 °C, with the ultimate tensile strength and tensile elongation of 1237 MPa/23.3 % and 1753 MPa/5.1 %, respectively. Furthermore, the deformation mechanism of the alloys was analyzed, and dislocation slip in α<sub>p</sub> phase and β grain was demonstrated to be the main plastic deformation mode.</div></div>","PeriodicalId":385,"journal":{"name":"Materials Science and Engineering: A","volume":"922 ","pages":"Article 147635"},"PeriodicalIF":6.1,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143103824","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

Microstructure and properties of single crystal copper prepared by hot type horizontal continuous casting 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.2025.147924

Hanjiang Wu , Tao Huang , Kexing Song , Yanjun Zhou , Shaolin Li , Xiaowen Peng , YunXiao Hua , YiZhe Xu , Xiangyun Han , Ximeng Luo

Single crystal copper exhibits superior conductivity compared to polycrystalline copper due to its lack of internal grain boundaries, finding extensive application in the field of electronic information transmission. The hot horizontal continuous casting method, employed for the fabrication of single crystal copper rods, directly influences their production and quality. This study simulated the effects of process parameters on the temperature and solidification fields during hot horizontal continuous casting, utilizing the directional solidification method. Comparative analyses of microstructural and mechanical properties between fabricated single and polycrystalline copper rods were conducted to provide a scientific basis and technical support for the optimization and application of copper rod materials in specific fields. Findings indicate that the melt temperature minimally affects the position of the solid-liquid interface in hot continuous casting. An increase in mold temperature causes a slight outward shift in this interface, while an increase in casting speed significantly displaces it outward, raising the risks of breakage and leakage. The interior of single crystal copper rods primarily contains a sparse distribution of discrete dislocations, forming a preferred orientation pattern dominated by < 100> texture, with a fracture mode of microporous growth. In contrast, polycrystalline copper rods contain numerous dislocation cells, forming <111>+<110> discrete textures, which are more varied than those in single crystal rods, leading to a ductile dimple-microporous aggregation fracture mode. The conductivity and elongation of single crystal copper rods are markedly higher than those of polycrystalline rods, thus affirming their exceptional electrical conductivity and plastic processing capabilities.

{"title":"Microstructure and properties of single crystal copper prepared by hot type horizontal continuous casting process","authors":"Hanjiang Wu , Tao Huang , Kexing Song , Yanjun Zhou , Shaolin Li , Xiaowen Peng , YunXiao Hua , YiZhe Xu , Xiangyun Han , Ximeng Luo","doi":"10.1016/j.msea.2025.147924","DOIUrl":"10.1016/j.msea.2025.147924","url":null,"abstract":"<div><div>Single crystal copper exhibits superior conductivity compared to polycrystalline copper due to its lack of internal grain boundaries, finding extensive application in the field of electronic information transmission. The hot horizontal continuous casting method, employed for the fabrication of single crystal copper rods, directly influences their production and quality. This study simulated the effects of process parameters on the temperature and solidification fields during hot horizontal continuous casting, utilizing the directional solidification method. Comparative analyses of microstructural and mechanical properties between fabricated single and polycrystalline copper rods were conducted to provide a scientific basis and technical support for the optimization and application of copper rod materials in specific fields. Findings indicate that the melt temperature minimally affects the position of the solid-liquid interface in hot continuous casting. An increase in mold temperature causes a slight outward shift in this interface, while an increase in casting speed significantly displaces it outward, raising the risks of breakage and leakage. The interior of single crystal copper rods primarily contains a sparse distribution of discrete dislocations, forming a preferred orientation pattern dominated by < 100> texture, with a fracture mode of microporous growth. In contrast, polycrystalline copper rods contain numerous dislocation cells, forming <111>+<110> discrete textures, which are more varied than those in single crystal rods, leading to a ductile dimple-microporous aggregation fracture mode. The conductivity and elongation of single crystal copper rods are markedly higher than those of polycrystalline rods, thus affirming their exceptional electrical conductivity and plastic processing capabilities.</div></div>","PeriodicalId":385,"journal":{"name":"Materials Science and Engineering: A","volume":"927 ","pages":"Article 147924"},"PeriodicalIF":6.1,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143143185","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

Effect of Er, Zr, V, Ti microalloying and muti-field coupling melt deep purification on the microstructure and mechanical properties of Al-12Si-4.5Cu-2Ni 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.2024.147706

Jian Dong , Jufu Jiang , Ying Wang , Minjie Huang , Jingbo Cui , Tianxiang Qin , Lingbo Kong

In this study, the effects of Er, Zr, V and Ti microalloying and muti-field melt deep purification on the microstructure and mechanical properties of Al-12Si-4.5Cu-2Ni alloy were investigated. The phase diagram calculation and DSC curve showed that the second phases of microalloyed Al-12Si-4.5Cu-2Ni alloy was mainly AlCuNi phase, (Al, Si)₃(Zr, Ti, V)-D0₂₂/D0₂₃, Al₂Cu, Al₃(Zr, Er) and Al₂Si₂Sr. The solidus and liquidus temperatures were 518.1 °C and 597.4 °C, respectively. The addition of Er significantly refined the grains and formed L1₂-Al₃(Zr, Er) coherent with the α-Al matrix. Under the action of microalloying elements, the stacking fault energy of aluminum alloy was remarkably reduced, and extensive stacking faults appeared in the α-Al matrix and eutectic Si. Through the coupling degassing of Ar and ultrasonic field, the size and number of pores in the alloy ingot were not only reduced, but also the size of the second phase was refined and distributed more uniformly. The yield strength, ultimate tensile strength and elongation of the alloy after microalloying and multi-field coupling degassing reached 163.9 MPa, 300.2 MPa and 3.2 %, respectively. The second phase of microalloying Al-12Si-4.5Cu-2Ni alloy was systematically analyzed, which will provide a basis for the subsequent design of heat-resistant aluminum alloy and the formulation of subsequent heat treatment process parameters.

{"title":"Effect of Er, Zr, V, Ti microalloying and muti-field coupling melt deep purification on the microstructure and mechanical properties of Al-12Si-4.5Cu-2Ni alloy","authors":"Jian Dong , Jufu Jiang , Ying Wang , Minjie Huang , Jingbo Cui , Tianxiang Qin , Lingbo Kong","doi":"10.1016/j.msea.2024.147706","DOIUrl":"10.1016/j.msea.2024.147706","url":null,"abstract":"<div><div>In this study, the effects of Er, Zr, V and Ti microalloying and muti-field melt deep purification on the microstructure and mechanical properties of Al-12Si-4.5Cu-2Ni alloy were investigated. The phase diagram calculation and DSC curve showed that the second phases of microalloyed Al-12Si-4.5Cu-2Ni alloy was mainly AlCuNi phase, (Al, Si)<sub>3</sub>(Zr, Ti, V)-D0<sub>22</sub>/D0<sub>23</sub>, Al<sub>2</sub>Cu, Al<sub>3</sub>(Zr, Er) and Al<sub>2</sub>Si<sub>2</sub>Sr. The solidus and liquidus temperatures were 518.1 °C and 597.4 °C, respectively. The addition of Er significantly refined the grains and formed L1<sub>2</sub>-Al<sub>3</sub>(Zr, Er) coherent with the α-Al matrix. Under the action of microalloying elements, the stacking fault energy of aluminum alloy was remarkably reduced, and extensive stacking faults appeared in the α-Al matrix and eutectic Si. Through the coupling degassing of Ar and ultrasonic field, the size and number of pores in the alloy ingot were not only reduced, but also the size of the second phase was refined and distributed more uniformly. The yield strength, ultimate tensile strength and elongation of the alloy after microalloying and multi-field coupling degassing reached 163.9 MPa, 300.2 MPa and 3.2 %, respectively. The second phase of microalloying Al-12Si-4.5Cu-2Ni alloy was systematically analyzed, which will provide a basis for the subsequent design of heat-resistant aluminum alloy and the formulation of subsequent heat treatment process parameters.</div></div>","PeriodicalId":385,"journal":{"name":"Materials Science and Engineering: A","volume":"923 ","pages":"Article 147706"},"PeriodicalIF":6.1,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143143910","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

Microstructure and mechanical properties of nano-TiBw/TC4 titanium matrix composite fabricated by laser solid forming

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.2024.147736

Zhang Qi , Mao Xiaobo , Guan Yanying , Han Dong , Yang Lijuan , Zhang Xianjie

The laser solid forming (LSF) technique is widely recognized for its significant advantages in fabricating discontinuously reinforced titanium matrix composite (DRTMC). In this study, TC4 titanium alloy and reticular nano-TiB whiskers (TiBw)/TC4 composites were prepared using the LSF technique. The impact of trace boron on the evolution of the microstructure and mechanical properties was investigated. The in-situ synthesized nano-TiBw exhibited a network distribution, characterized by alternating equiaxed and columnar morphologies along the deposition direction. The TiBw network effectively refined the αTi grains and significantly reduced the texture intensity of αTi. The compressive yield stress and fracture strain of DRTMC were measured as 1351.4 MPa and 19.3 %, respectively, demonstrating excellent mechanical properties. The enhancement in yield strength was attributed primarily to the load transfer effect of TiBw and fine grain strengthening mechanisms. Furthermore, both TC4 titanium alloy and DRTMC exhibited a combination of brittle and ductile fracture modes, with cracks in DRTMC initiating from TiBw fractures during compressive testing.

{"title":"Microstructure and mechanical properties of nano-TiBw/TC4 titanium matrix composite fabricated by laser solid forming","authors":"Zhang Qi , Mao Xiaobo , Guan Yanying , Han Dong , Yang Lijuan , Zhang Xianjie","doi":"10.1016/j.msea.2024.147736","DOIUrl":"10.1016/j.msea.2024.147736","url":null,"abstract":"<div><div>The laser solid forming (LSF) technique is widely recognized for its significant advantages in fabricating discontinuously reinforced titanium matrix composite (DRTMC). In this study, TC4 titanium alloy and reticular nano-TiB whiskers (TiBw)/TC4 composites were prepared using the LSF technique. The impact of trace boron on the evolution of the microstructure and mechanical properties was investigated. The in-situ synthesized nano-TiBw exhibited a network distribution, characterized by alternating equiaxed and columnar morphologies along the deposition direction. The TiBw network effectively refined the αTi grains and significantly reduced the texture intensity of αTi. The compressive yield stress and fracture strain of DRTMC were measured as 1351.4 MPa and 19.3 %, respectively, demonstrating excellent mechanical properties. The enhancement in yield strength was attributed primarily to the load transfer effect of TiBw and fine grain strengthening mechanisms. Furthermore, both TC4 titanium alloy and DRTMC exhibited a combination of brittle and ductile fracture modes, with cracks in DRTMC initiating from TiBw fractures during compressive testing.</div></div>","PeriodicalId":385,"journal":{"name":"Materials Science and Engineering: A","volume":"923 ","pages":"Article 147736"},"PeriodicalIF":6.1,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143143913","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

Investigation on deformation behavior of high strength laminated heterostructured materials of ER120S-G high strength steel and 316L stainless steel fabricated by Wire-arc DED

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.2024.147750

Wei Chen , Zhen Wang , Yupeng Xuan , Shun Guo , Qi Zhou , Yong Peng , Kehong Wang

Thin walls of 316L stainless steel (SS), ER120S-G high strength steel (HSS), and laminated heterostructured materials (LHM) were successfully fabricated using the wire arc directed energy deposition (Wire-arc DED) technology, and their microstructure, chemical composition, and mechanical properties were comprehensively studied. Additionally, the deformation behavior of different layers and layer interfaces in the LHM thin walls was studied through interrupted tensile tests. The chemical composition of the different layers in the LHM thin walls changed due to element dilution, which led to alterations in the microstructure. Deformation behavior varies across different regions and phases of the LHM sample. Before necking in the LHM sample, the geometrically necessary dislocations (GNDs) accumulation rate in the FCC phase of the 316L SS layer was the fastest, followed by the BCC phase of the ER120S-G HSS layer, and finally the BCC phase of the 316L SS layer. After necking, the GNDs accumulation rate in the BCC phase of the ER120S-G HSS layer became the fastest, followed by the FCC phase of the 316L SS layer, and lastly the BCC phase of the 316L SS layer. This non-uniform deformation mechanism differs significantly from the deformation mechanisms of traditional homogeneous materials. During the loading deformation of the LHM, stress-induced martensite generated in 316L SS layer. The grains of ER120S-G layer were deformed along the tensile direction and developed strong {110}<100> Goss texture, {110}<110> R-Goss texture, and {001}<110> R-Cube texture. This study provides guidance for the development and engineering application of laminated heterostructured materials.

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引用次数: 0

High strain rate deformation behavior of QP1180 advanced high-strength steel for automobiles

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.2024.147735

Shuangjie Chu , Wenting Zhu , Bo Mao , Guangkui Hu

To advance the use of quenching and partitioning (QP) steel in the automotive sector necessitates a comprehensive understanding of its behavior under both static and dynamic loading conditions. Thus, the present article aims at elucidating the effect of strain rate on microstructural alterations and mechanical response in a QP steel with an ultimate tensile strength of 1180 MPa. When the strain rate was elevated from 10⁻³ s⁻¹ to 10² s⁻¹, the ultimate tensile strength increased from 1191 MPa to 1318 MPa. Despite substantial transformation of retained austenite into martensite, which activated the transformation-induced plasticity (TRIP) effect, the total elongation initially decreased to 22.2 % before increasing to 29.3 % at a strain rate of 10² s⁻¹. To examine the mechanisms behind this unusual trend in total elongation, the evolution of martensite transformation, twin martensite, carbide precipitation, and dislocation density with strain rate was analyzed via electron microscopy and X-ray diffraction. The results showed that interactions between dislocations and twins reduced the lengths of twin boundaries and exacerbated plastic deformation by inducing severe lattice distortions. In addition, higher strain rates prompted carbon redistribution, leading to carbon clustering and formation of ε-carbides. The shear deformation mechanisms ultimately led to improved strength and ductility as the strain rates increased.

{"title":"High strain rate deformation behavior of QP1180 advanced high-strength steel for automobiles","authors":"Shuangjie Chu , Wenting Zhu , Bo Mao , Guangkui Hu","doi":"10.1016/j.msea.2024.147735","DOIUrl":"10.1016/j.msea.2024.147735","url":null,"abstract":"<div><div>To advance the use of quenching and partitioning (QP) steel in the automotive sector necessitates a comprehensive understanding of its behavior under both static and dynamic loading conditions. Thus, the present article aims at elucidating the effect of strain rate on microstructural alterations and mechanical response in a QP steel with an ultimate tensile strength of 1180 MPa. When the strain rate was elevated from 10<sup>−3</sup> s<sup>−1</sup> to 10<sup>2</sup> s<sup>−1</sup>, the ultimate tensile strength increased from 1191 MPa to 1318 MPa. Despite substantial transformation of retained austenite into martensite, which activated the transformation-induced plasticity (TRIP) effect, the total elongation initially decreased to 22.2 % before increasing to 29.3 % at a strain rate of 10<sup>2</sup> s<sup>−1</sup>. To examine the mechanisms behind this unusual trend in total elongation, the evolution of martensite transformation, twin martensite, carbide precipitation, and dislocation density with strain rate was analyzed via electron microscopy and X-ray diffraction. The results showed that interactions between dislocations and twins reduced the lengths of twin boundaries and exacerbated plastic deformation by inducing severe lattice distortions. In addition, higher strain rates prompted carbon redistribution, leading to carbon clustering and formation of ε-carbides. The shear deformation mechanisms ultimately led to improved strength and ductility as the strain rates increased.</div></div>","PeriodicalId":385,"journal":{"name":"Materials Science and Engineering: A","volume":"923 ","pages":"Article 147735"},"PeriodicalIF":6.1,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143144347","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

Mechanism of microstructure evolution and mechanical properties of high Nb-TiAl alloy in transition zone of laser-deposited Ti60/TiAl alloys

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.2024.147726

Jie Ding , Feng Chen , Qinghua Deng , Ruifeng Li , Shuai Xu , Liang Yang , Junpin Lin , Hui Chang

The transition zone of the Ti/TiAl alloy with a nominal composition of TiAl-5.5Nb was fabricated using laser melting deposition (LMD) of a powder mixture consisting of 30 % Ti60 and 70 % Ti-45Al-8Nb (wt. %). The microstructural evolution and mechanical properties were investigated. Upon thermal exposure at 650 °C and 800 °C, three distinct types of γ phase were observed: γ lamellae, γ blocks, and nanoscale γ clusters. Additionally, nanoscale ω particles were observed to coarsen at 650 °C, while they dissolved into the B2 phase after exposure at 800 °C. Notably, the tensile strength, yield strength, and plastic elongation of the specimens were significantly improved by 25.5 %, 23.9 %, and 47.2 %, respectively, following thermal exposure at 800 °C. This enhancement was attributed to the dissolution of ω particles and the subsequent precipitation of γ blocks.

引用次数: 0

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