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

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	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.
刊名	ACTA MATERIALIA
	2018-02-15
卷号	145 页码:413-428
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
ISSN号	1359-6454
英文摘要	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.
学科主题	Materials Science, Multidisciplinary ; Metallurgy & Metallurgical Engineering
语种	英语
资助机构	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
公开日期	2018-06-05
内容类型	期刊论文
源URL	[http://ir.imr.ac.cn/handle/321006/79498]
专题	金属研究所_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.