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

doi:10.1016/j.msea.2022.142727

IMECH-IR > 非线性力学国家重点实验室

	Twin density gradient induces enhanced yield strength-and-ductility synergy in a S31254 super austenitic stainless steel
	Chen TT(陈婷婷)1,2; Wang J(王晶)2 ; Zhang Y 1; Jiang P(姜萍)2 ; Yuan FP(袁福平)2,3 ; Han PD 1; Wu XL(武晓雷)2,3
通讯作者	Han, Pei-De(hanpeide@tyut.edu.cn) ; Wu, Xiao-Lei(xlwu@imech.ac.cn)
发表期刊	MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
	2022-03-14
卷号	837 页码:7
ISSN	0921-5093
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.
关键词	Gradient structure Deformation twin Strain hardening Hetero -deformation
DOI	10.1016/j.msea.2022.142727
收录类别	SCI ; EI
语种	英语
WOS记录号	WOS:000761677700002
关键词[WOS]	HETEROSTRUCTURED MATERIALS ; NANOSTRUCTURED METALS ; SURFACE-LAYER ; PLASTICITY ; DEFORMATION ; MECHANISM
WOS研究方向	Science & Technology - Other Topics ; Materials Science ; Metallurgy & Metallurgical Engineering
WOS类目	Nanoscience & Nanotechnology ; Materials Science, Multidisciplinary ; Metallurgy & Metallurgical Engineering
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]
项目资助者	Ministry of Science and Technology of China ; NSFC Basic Science Center Program ; NSFC ; Chinese Academy of Sciences
论文分区	一类
力学所作者排名	1
RpAuthor	Han, Pei-De ; Wu, Xiao-Lei
引用统计	被引频次：10[WOS] [WOS记录] [WOS相关记录]
文献类型	期刊论文
条目标识符	http://dspace.imech.ac.cn/handle/311007/88752
专题	非线性力学国家重点实验室
作者单位	1.Taiyuan Univ Technol, Sch Mat Sci & Engn, Taiyuan 030024, Peoples R China; 2.Chinese Acad Sci, Inst Mech, State Key Lab Nonlinear Mech, Beijing 100190, Peoples R China; 3.Univ Chinese Acad Sci, Sch Engn Sci, Beijing 100049, Peoples R China
推荐引用方式 GB/T 7714	Chen TT,Wang J,Zhang Y,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	陈婷婷.,王晶.,Zhang Y.,姜萍.,袁福平.,...&武晓雷.(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	陈婷婷,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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