Tailoring microstructure evolution and austenite stability of TRIP steels by Rare-Earth micro-alloying

doi:10.1016/j.matchar.2023.113035

IMR OpenIR

	Tailoring microstructure evolution and austenite stability of TRIP steels by Rare-Earth micro-alloying
	Liu, Peng 1,2; Hou, Xiaodong 3; Yang, Chaoyun 1; Luan, Yikun 1,2; Zheng, Chengwu 1,2; Li, Dianzhong 1,2; Ma, Guangcai 1
通讯作者	Luan, Yikun(ykluan@imr.ac.cn) ; Li, Dianzhong(dzli@imr.ac.cn)
	2023-09-01
发表期刊	MATERIALS CHARACTERIZATION
ISSN	1044-5803
卷号	203 页码:16
摘要	The microstructure evolution and austenite stability of Rare Earth (RE)-alloyed Transformation Induced Plasticity (TRIP) steels subjected to intercritical annealing and isothermal bainitic transformation have been investigated for superior strength-ductility performance. Structure morphology, austenitizing temperature and phase proportion during thermomechanical process were carefully compared, confirming that minor RE additions indeed refined the microstructure, and affected the thermodynamics of austenite and bainite transformation. Austenitizing ranges of TRIP steels were lifted with increasing RE content then stabilized when exceeding 360 ppm; the intercritical austenite reduced but dissolved more C-Mn atoms, hence the bainite transformation in REalloyed TRIP steels was significantly inhibited, which elevated the retained austenite quantity and thermal stability simultaneously. Therein, more austenite nucleated from the structure fragments with RE-refined lamellar morphologies and strictly grew into acicular counterparts or aggregated into clusters. The aggregated austenite, composed of several subgrains with [011] coaxial relations or & sigma;3 60 degrees 111 misorientation but coherent interfaces, were engulfed or being swallowed up by coalescing ferrites in sluggish growth, guaranteeing the higher mechanical stability than intergranular austenite. In this study, the product of strength and elongation of TRIP steels after optimized RE-alloying was increased by 38% as compared to that without RE additions. The micro-alloying effect of RE elements in TRIP steels highlights the innovations of new-generation automotive steels.
关键词	TRIP steels RE micro-alloying Retained austenite Thermomechanical stability Microstructure
资助者	National Natural Science Foundation of China ; Key Research Program of the Chinese Academy of Sciences ; Guangdong Introducing Innovative and Enter- preneurial Teams
DOI	10.1016/j.matchar.2023.113035
收录类别	SCI
语种	英语
资助项目	National Natural Science Foundation of China[52101165] ; National Natural Science Foundation of China[52031013] ; National Natural Science Foundation of China[52071322] ; National Natural Science Foundation of China[U1708252] ; Key Research Program of the Chinese Academy of Sciences[ZDRW-CN-2021-3] ; Key Research Program of the Chinese Academy of Sciences[KFG-2018107] ; Guangdong Introducing Innovative and Enter- preneurial Teams[2016ZT06G025]
WOS研究方向	Materials Science ; Metallurgy & Metallurgical Engineering
WOS类目	Materials Science, Multidisciplinary ; Metallurgy & Metallurgical Engineering ; Materials Science, Characterization & Testing
WOS记录号	WOS:001026714300001
出版者	ELSEVIER SCIENCE INC
引用统计	被引频次：8[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/321006/178589
专题	中国科学院金属研究所
通讯作者	Luan, Yikun; Li, Dianzhong
作者单位	1.Chinese Acad Sci, Inst Met Res, Shenyang Natl Lab Mat Sci, 72 Wen Hua Rd, Shenyang 110016, Peoples R China 2.Univ Sci & Technol China, Sch Mat Sci & Engn, 72 Wen Hua Rd, Shenyang 110016, Peoples R China 3.Ctr Excellence Adv Mat, Qinyuan Rd, Dongguan 523808, Peoples R China
推荐引用方式 GB/T 7714	Liu, Peng,Hou, Xiaodong,Yang, Chaoyun,et al. Tailoring microstructure evolution and austenite stability of TRIP steels by Rare-Earth micro-alloying[J]. MATERIALS CHARACTERIZATION,2023,203:16.
APA	Liu, Peng.,Hou, Xiaodong.,Yang, Chaoyun.,Luan, Yikun.,Zheng, Chengwu.,...&Ma, Guangcai.(2023).Tailoring microstructure evolution and austenite stability of TRIP steels by Rare-Earth micro-alloying.MATERIALS CHARACTERIZATION,203,16.
MLA	Liu, Peng,et al."Tailoring microstructure evolution and austenite stability of TRIP steels by Rare-Earth micro-alloying".MATERIALS CHARACTERIZATION 203(2023):16.