Cerium refinement of grains and primary carbides during solidification of Cr4Mo4V bearing steel*

doi:10.1016/j.jre.2023.05.001

IMR OpenIR

	Cerium refinement of grains and primary carbides during solidification of Cr4Mo4V bearing steel*
	Liu, Weifeng 1; Wang, Jianqiang 2; Sun, Mingyue 2; Xu, Bin 2; Yao, Jiahao 1; Fan, Qunbo 1; Li, Dianzhong 2
通讯作者	Sun, Mingyue(mysun@imr.ac.cn) ; Li, Dianzhong(dzli@imr.ac.cn)
	2024-04-01
发表期刊	JOURNAL OF RARE EARTHS
ISSN	1002-0721
卷号	42 期号:4 页码:783-792
摘要	The effect of cerium (Ce) on the solidification microstructure of Cr4Mo4V bearing steel was investigated via a combined experimental and theoretical method. With a trace amount (0.056 wt%) of Ce addition, the coarse columnar grains in as-cast microstructure transform into equiaxed ones, and the average diameter is reduced from 56 to 27 mm. The network-like and bulky primary MC and M2C carbides at the interdendritic regions become disconnected and refined, and their volume percentage decreases from 4.15 vol% to 2.1 vol%. Ce-inclusions acting as heterogeneous nucleation agents of prior-austenite grains and Ce atoms segregating at grain boundaries, both contribute to the refinement of grains. Thermodynamic calculations reveal that primary carbides are precipitated after g-austenite forms near the end of the solidification process. The modification of primary carbides in size and amount is mainly attributed to the isolated remaining melt separated by refined g-austenite grains in which the nucleation of carbides is promoted, while the growth is restrained owing to the less segregation of alloying elements. (c) 2024 Published by Elsevier B.V. on behalf of Chinese Society of Rare Earths.
关键词	Cr4Mo4V bearing steel Rare Earths Grains Primary carbides Refinement
DOI	10.1016/j.jre.2023.05.001
收录类别	SCI
语种	英语
WOS研究方向	Chemistry
WOS类目	Chemistry, Applied
WOS记录号	WOS:001217552800001
出版者	ELSEVIER
引用统计	被引频次：12[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/321006/186105
专题	中国科学院金属研究所
通讯作者	Sun, Mingyue; Li, Dianzhong
作者单位	1.Beijing Inst Technol, Chongqing Innovat Ctr, Chongqing 401135, Peoples R China 2.Chinese Acad Sci, Inst Met Res, Shenyang Natl Lab Mat Sci, Shenyang 110016, Peoples R China
推荐引用方式 GB/T 7714	Liu, Weifeng,Wang, Jianqiang,Sun, Mingyue,et al. Cerium refinement of grains and primary carbides during solidification of Cr4Mo4V bearing steel*[J]. JOURNAL OF RARE EARTHS,2024,42(4):783-792.
APA	Liu, Weifeng.,Wang, Jianqiang.,Sun, Mingyue.,Xu, Bin.,Yao, Jiahao.,...&Li, Dianzhong.(2024).Cerium refinement of grains and primary carbides during solidification of Cr4Mo4V bearing steel*.JOURNAL OF RARE EARTHS,42(4),783-792.
MLA	Liu, Weifeng,et al."Cerium refinement of grains and primary carbides during solidification of Cr4Mo4V bearing steel*".JOURNAL OF RARE EARTHS 42.4(2024):783-792.