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

文献类型：期刊论文

作者Liu, Peng1,2; Hou, Xiaodong3; Yang, Chaoyun2; Luan, Yikun1,2; Zheng, Chengwu1,2; Li, Dianzhong1,2; Ma, Guangcai2
刊名MATERIALS CHARACTERIZATION
出版日期2023-09-01
卷号203页码:16
关键词TRIP steels RE micro-alloying Retained austenite Thermomechanical stability Microstructure
ISSN号1044-5803
DOI10.1016/j.matchar.2023.113035
通讯作者Luan, Yikun(ykluan@imr.ac.cn) ; Li, Dianzhong(dzli@imr.ac.cn)
英文摘要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.
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
语种英语
WOS记录号WOS:001026714300001
出版者ELSEVIER SCIENCE INC
资助机构National Natural Science Foundation of China ; Key Research Program of the Chinese Academy of Sciences ; Guangdong Introducing Innovative and Enter- preneurial Teams
源URL[http://ir.imr.ac.cn/handle/321006/178588]  
专题金属研究所_中国科学院金属研究所
通讯作者Luan, Yikun; Li, Dianzhong
作者单位1.Univ Sci & Technol China, Sch Mat Sci & Engn, 72 Wen Hua Rd, Shenyang 110016, Peoples R China
2.Chinese Acad Sci, Inst Met Res, Shenyang Natl Lab Mat Sci, 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.

入库方式： OAI收割

来源：金属研究所

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