Simultaneous improvement of strength and plasticity: Nano-twin construction for a novel high-nitrogen TWIP steel

doi:10.1016/j.ijplas.2024.104144

IMR OpenIR

	Simultaneous improvement of strength and plasticity: Nano-twin construction for a novel high-nitrogen TWIP steel
	Lu, Sihan 1,2; Wang, Qingchuan 1; Yao, Tingting 1; Feng, Hao 3; Gao, Ming 1; Xi, Tong 1; Li, Huabing 3; Tan, Lili 1; Yang, Ke 1
通讯作者	Wang, Qingchuan(qcwang11s@imr.ac.cn) ; Li, Huabing(lihb@smm.neu.edu.cn) ; Tan, Lili(lltan@imr.ac.cn)
	2024-12-01
发表期刊	INTERNATIONAL JOURNAL OF PLASTICITY
ISSN	0749-6419
卷号	183 页码:18
摘要	For metallic materials, an increase in strength generally results in a decrease in plasticity, and the simultaneous improvement of strength and plasticity (SISP) has been a hot but difficult topic. In this study, through high-nitrogen (N) alloying, a novel high-N twinning-induced plasticity (HNTWIP) steel was designed. It was surprisingly found that, with higher N content, the SISP was achieved successfully. Compared to 0.3 N, the ultimate tensile strength and uniform elongation of 0.6 N increased by 95 MPa and 5.6 %, respectively. Systematic microstructural analyses indicated that more and thinner twins formed at higher N content during the deformation. Especially, different with conventional TWIP (CV-TWIP) steels, numerous ultrafine nano-twins (<15 nm) were detected in HN-TWIP steels. Combined with the flow stress analyses, their strengthening behavior was found to be attributed to both the N solid solution strengthening and nano-twin strengthening. More importantly, by promoting planar slip, the ultrafine nano-twins provided an additional work-hardening and delayed the necking appearance, which resulted in plasticity enhancement. In other words, the origin of the strength-ductility trade-off avoidance was the nano-twins/ultrafine nano-twins microstructure. Further studies revealed that, by breaking the conflict of low stacking fault energy (SFE) and excellent austenite stability, HN-TWIP steels obtained a breakthrough reduction in SFE. HN-TWIP steels with the extremely low SFE could acquire the special nano-twin microstructure and the SISP mechanical behavior. Accordingly, only by continuously reducing the SFE in the alloying design, the difficult SISP could be realized in TWIP steels. This is a novel and simple strategy for the modification of the metal mechanical properties, and it is meaningful for materials in engineering applications.
关键词	TWIP steels High-nitrogen Strength Plasticity Nano-twins Stacking fault energy
资助者	Research Program of Liaoning Province of China
DOI	10.1016/j.ijplas.2024.104144
收录类别	SCI
语种	英语
资助项目	Research Program of Liaoning Province of China[2022020347-JH2/1013]
WOS研究方向	Engineering ; Materials Science ; Mechanics
WOS类目	Engineering, Mechanical ; Materials Science, Multidisciplinary ; Mechanics
WOS记录号	WOS:001334731700001
出版者	PERGAMON-ELSEVIER SCIENCE LTD
引用统计	被引频次：7[WOS] [WOS记录] [WOS相关记录]
文献类型	期刊论文
条目标识符	http://ir.imr.ac.cn/handle/321006/190699
专题	中国科学院金属研究所
通讯作者	Wang, Qingchuan; Li, Huabing; Tan, Lili
作者单位	1.Chinese Acad Sci, Inst Met Res, Shenyang 110016, Peoples R China 2.China Med Univ, Sch Intelligent Med, Shenyang 110122, Peoples R China 3.Northeastern Univ, Sch Met, Shenyang 110819, Peoples R China
推荐引用方式 GB/T 7714	Lu, Sihan,Wang, Qingchuan,Yao, Tingting,et al. Simultaneous improvement of strength and plasticity: Nano-twin construction for a novel high-nitrogen TWIP steel[J]. INTERNATIONAL JOURNAL OF PLASTICITY,2024,183:18.
APA	Lu, Sihan.,Wang, Qingchuan.,Yao, Tingting.,Feng, Hao.,Gao, Ming.,...&Yang, Ke.(2024).Simultaneous improvement of strength and plasticity: Nano-twin construction for a novel high-nitrogen TWIP steel.INTERNATIONAL JOURNAL OF PLASTICITY,183,18.
MLA	Lu, Sihan,et al."Simultaneous improvement of strength and plasticity: Nano-twin construction for a novel high-nitrogen TWIP steel".INTERNATIONAL JOURNAL OF PLASTICITY 183(2024):18.