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Twin density gradient induces enhanced yield strength-and-ductility synergy in a S31254 super austenitic stainless steel

文献类型：期刊论文

作者Chen, Ting-Ting2,3; Wang, Jing2; Zhang, Yi3; Jiang, Ping2; Yuan, Fu-Ping1,2; Han, Pei-De3; Wu, Xiao-Lei1,2; Yuan FP(袁福平); Wang J(王晶); Zhang Y
刊名MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
出版日期2022-03-14
卷号837页码:7
关键词Gradient structure Deformation twin Strain hardening Hetero -deformation
ISSN号0921-5093
DOI10.1016/j.msea.2022.142727
通讯作者Han, Pei-De(hanpeide@tyut.edu.cn) ; Wu, Xiao-Lei(xlwu@imech.ac.cn)
英文摘要Gradient structure (GS), as a typical heterostructure, is arousing great interest for an improved synergy between the strength and ductility which are mutually conflicting. Recently, a novel design of GS is proposed by taking the density of twins in grains, instead of common grain size, as a gradient variable, showing the key role in strain hardening by the nano-scale twin boundaries. Following this idea, here, a deformation twin-density GS was produced by means of the technique of surface mechanical attrition treatment in a S31254 super austenitic stainless steel. To be specific, the GS consisted of a central coarse-grained (CG) core, with two sides sandwiched by the gradient-structured layer (GL), where the density of deformation twins appears gradient in grains along the depth towards the CG core. The tensile tests show that as compared to CG counterpart, yield strength in GS increases 80% to 0.5 GPa, along with comparable ductility of 36%. The interrupted tensile tests show the presence of mechanical hysteresis loops during each unload-reload cycle, indicative of the generation of heterodeformation-induced (HDI) stress during tensile deformation. Furthermore, both the HDI stress and HDI strain hardening account for a large proportion of global flow stress and forest hardening. The deformation twins and their evolutions, with the emphasis on their interaction with the dislocations, are investigated in detail by means of EBSD and TEM observations to correlate the mechanical properties. The present results shed light on the crucial role of deformation twins in the twin-density gradient for the synergistic enhancement of both strength and ductility.
WOS关键词HETEROSTRUCTURED MATERIALS ; NANOSTRUCTURED METALS ; SURFACE-LAYER ; PLASTICITY ; DEFORMATION ; MECHANISM
资助项目Ministry of Science and Technology of China[2019YFA0209900] ; Ministry of Science and Technology of China[2017YFA0204402] ; NSFC Basic Science Center Program[11988102] ; NSFC[51871159] ; NSFC[11972350] ; NSFC[11890680] ; Chinese Academy of Sciences[XDB22040503]
WOS研究方向Science & Technology - Other Topics ; Materials Science ; Metallurgy & Metallurgical Engineering
语种英语
WOS记录号WOS:000761677700002
资助机构Ministry of Science and Technology of China ; NSFC Basic Science Center Program ; NSFC ; Chinese Academy of Sciences
源URL[http://dspace.imech.ac.cn/handle/311007/88751]  
专题力学研究所_非线性力学国家重点实验室
通讯作者Han, Pei-De; Wu, Xiao-Lei
作者单位1.Univ Chinese Acad Sci, Sch Engn Sci, Beijing 100049, Peoples R China
2.Chinese Acad Sci, Inst Mech, State Key Lab Nonlinear Mech, Beijing 100190, Peoples R China
3.Taiyuan Univ Technol, Sch Mat Sci & Engn, Taiyuan 030024, Peoples R China
推荐引用方式
GB/T 7714		 Chen, Ting-Ting,Wang, Jing,Zhang, Yi,et al. Twin density gradient induces enhanced yield strength-and-ductility synergy in a S31254 super austenitic stainless steel[J]. MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING,2022,837:7.
APA Chen, Ting-Ting.,Wang, Jing.,Zhang, Yi.,Jiang, Ping.,Yuan, Fu-Ping.,...&姜萍.(2022).Twin density gradient induces enhanced yield strength-and-ductility synergy in a S31254 super austenitic stainless steel.MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING,837,7.
MLA Chen, Ting-Ting,et al."Twin density gradient induces enhanced yield strength-and-ductility synergy in a S31254 super austenitic stainless steel".MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING 837(2022):7.

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来源：力学研究所

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