Simultaneous improvement of strength and plasticity: Additional work-hardening from gradient microstructure

IMR OpenIR

	Simultaneous improvement of strength and plasticity: Additional work-hardening from gradient microstructure
	Shao, CW; Zhang, P; Zhu, YK; Zhang, ZJ; Tian, YZ; Zhang, ZF; Zhang, ZF (reprint author), Chinese Acad Sci, Inst Met Res, Shenyang Natl Lab Mat Sci, Shenyang 110016, Liaoning, Peoples R China.
	2018-02-15
发表期刊	ACTA MATERIALIA
ISSN	1359-6454
卷号	145 页码:413-428
摘要	Enhancing strength-ductility synergy of materials has always been a hot but difficult topic in material science, for most structural materials, steels in particular, it is inevitable to sacrifice ductility when increasing strength, and vice versa. In this study, by introducing a linear gradient in grain size into Fe-Mn-C twinning-induced plasticity (TWIP) steel, which is one of the promising structural steels in automobile industry, it is interesting to find that a simultaneous improvement of strength and plasticity (SISP) has been successfully achieved. It is believed that this evasion of strength-ductility trade-off may be mainly attributed to the formation of geometric necessary dislocations during tensile deformation, which contributes to an additional work-hardening especially in the later deformation. Such extraordinary strain hardening, which is inherent to the gradient structures and is absent in homogeneous materials, helps enhance the strength and delay the necking. This represents a novel strategy for the strength-ductility improvement which emphasizes the importance of work hardening and thickness of gradient layer (not a narrow sharp gradient) in material design. Inspired by this, other methods on optimizing structural design of the high-performance materials may be developed. (C) 2017 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.; Enhancing strength-ductility synergy of materials has always been a hot but difficult topic in material science, for most structural materials, steels in particular, it is inevitable to sacrifice ductility when increasing strength, and vice versa. In this study, by introducing a linear gradient in grain size into Fe-Mn-C twinning-induced plasticity (TWIP) steel, which is one of the promising structural steels in automobile industry, it is interesting to find that a simultaneous improvement of strength and plasticity (SISP) has been successfully achieved. It is believed that this evasion of strength-ductility trade-off may be mainly attributed to the formation of geometric necessary dislocations during tensile deformation, which contributes to an additional work-hardening especially in the later deformation. Such extraordinary strain hardening, which is inherent to the gradient structures and is absent in homogeneous materials, helps enhance the strength and delay the necking. This represents a novel strategy for the strength-ductility improvement which emphasizes the importance of work hardening and thickness of gradient layer (not a narrow sharp gradient) in material design. Inspired by this, other methods on optimizing structural design of the high-performance materials may be developed. (C) 2017 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
部门归属	[shao, c. w. ; zhang, p. ; zhu, y. k. ; zhang, z. j. ; tian, y. z. ; zhang, z. f.] chinese acad sci, inst met res, shenyang natl lab mat sci, shenyang 110016, liaoning, peoples r china ; [shao, c. w. ; zhang, z. f.] univ chinese acad sci, beijing 100049, peoples r china
关键词	Materials Design Principles Cycle Fatigue Resistance Stress-strain Behavior Low-carbon Steels Mechanical-properties Fe-mn Tensile Properties Grain-orientation Austenitic Steel Twip Steels
学科领域	Materials Science, Multidisciplinary ; Metallurgy & Metallurgical Engineering
资助者	National Natural Science Foundation of China (NSFC) [51301179, 51331007, 51501198, U1664253]; found of Shenyang National Laboratory for Materials Science (SYNL) [2017FP24]; IMR SYNL-T.S. Ke Research Fellowship
收录类别	SCI
语种	英语
文献类型	期刊论文
条目标识符	http://ir.imr.ac.cn/handle/321006/79498
专题	中国科学院金属研究所
通讯作者	Zhang, P; Zhang, ZF (reprint author), Chinese Acad Sci, Inst Met Res, Shenyang Natl Lab Mat Sci, Shenyang 110016, Liaoning, Peoples R China.
推荐引用方式 GB/T 7714	Shao, CW,Zhang, P,Zhu, YK,et al. Simultaneous improvement of strength and plasticity: Additional work-hardening from gradient microstructure[J]. ACTA MATERIALIA,2018,145:413-428.
APA	Shao, CW.,Zhang, P.,Zhu, YK.,Zhang, ZJ.,Tian, YZ.,...&Zhang, ZF .(2018).Simultaneous improvement of strength and plasticity: Additional work-hardening from gradient microstructure.ACTA MATERIALIA,145,413-428.
MLA	Shao, CW,et al."Simultaneous improvement of strength and plasticity: Additional work-hardening from gradient microstructure".ACTA MATERIALIA 145(2018):413-428.