Formation mechanism of MC and M2C primary carbides in as-cast M50 bearing steel

doi:10.1016/j.matchar.2021.111011

IMR OpenIR

	Formation mechanism of MC and M2C primary carbides in as-cast M50 bearing steel
	Du, Ningyu 1,2; Liu, Hanghang 1; Cao, Yanfei 1; Fu, Paixian 1; Sun, Chen 1,2; Liu, Hongwei 1; Li, Dianzhong 1
通讯作者	Liu, Hongwei(hwliu@imr.ac.cn) ; Li, Dianzhong(dzli@imr.ac.cn)
	2021-04-01
发表期刊	MATERIALS CHARACTERIZATION
ISSN	1044-5803
卷号	174 页码:14
摘要	Based on thermodynamic calculations and experimental characterizations, the characteristics, formation mechanism, and evolution process of two typical primary carbides in as-cast M50 bearing steel were systematically investigated. According to X-ray diffraction (XRD) and transmission electron microscopy (TEM) observations, MC and M2C appear as the V-rich FCC structure and Mo-rich HCP structure, respectively. Thermodynamic calculations show that both carbides cannot precipitate from liquid directly under thermoequilibrium solidification. However, due to the solute-enriched phenomenon during solidification, primary carbides can still form. It is further found that, though both M2C and MC nucleate at these segregated zones, M2C precipitate earlier than MC. It is caused by the distinct segregation extents of Mo and V and undercooling of two primary carbides, which consequently also lead to the difference of growing evolution process and the final carbides morphology. Besides, the Kikuchi patterns obtained by electron backscattered diffraction (EBSD) and the TEM dark-field micrograph show that nucleation position and growth direction of MC and M2C carbides have a selective orientation at the austenite boundaries. Finally, two significant ideas of increasing nucleation by breaking dendrite and adjusting the proportion of Mo and V contents are proposed to control large-sized primary carbides in engineering.
关键词	Bearing steel Primary carbide Segregation Solidification MC M2C
资助者	National Key Research and Development Program ; National Natural Science Foundation of China ; National Science and Technology Major Project ; Young Talent Project by SYNL ; Innovation project of the cutting-edge basic research and key technology by SYNL ; Project to Strengthen Industrial Development at the Grass-roots Level
DOI	10.1016/j.matchar.2021.111011
收录类别	SCI
语种	英语
资助项目	National Key Research and Development Program[2018YFA0702901] ; National Natural Science Foundation of China[51701225] ; National Science and Technology Major Project[2017-VII-0008-0101] ; Young Talent Project by SYNL[L2019F33] ; Innovation project of the cutting-edge basic research and key technology by SYNL[L2019R36] ; Project to Strengthen Industrial Development at the Grass-roots Level[TC190A4DA/35]
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:000640907100003
出版者	ELSEVIER SCIENCE INC
引用统计	被引频次：56[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/321006/162121
专题	中国科学院金属研究所
通讯作者	Liu, Hongwei; Li, Dianzhong
作者单位	1.Chinese Acad Sci, Inst Met Res, Shenyang Natl Lab Mat Sci, Shenyang 110016, Peoples R China 2.Univ Sci & Technol China, Sch Mat Sci & Engn, Shenyang 110016, Peoples R China
推荐引用方式 GB/T 7714	Du, Ningyu,Liu, Hanghang,Cao, Yanfei,et al. Formation mechanism of MC and M2C primary carbides in as-cast M50 bearing steel[J]. MATERIALS CHARACTERIZATION,2021,174:14.
APA	Du, Ningyu.,Liu, Hanghang.,Cao, Yanfei.,Fu, Paixian.,Sun, Chen.,...&Li, Dianzhong.(2021).Formation mechanism of MC and M2C primary carbides in as-cast M50 bearing steel.MATERIALS CHARACTERIZATION,174,14.
MLA	Du, Ningyu,et al."Formation mechanism of MC and M2C primary carbides in as-cast M50 bearing steel".MATERIALS CHARACTERIZATION 174(2021):14.