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Formation mechanism of MC and M2C primary carbides in as-cast M50 bearing steel
Du, Ningyu1,2; Liu, Hanghang1; Cao, Yanfei1; Fu, Paixian1; Sun, Chen1,2; Liu, Hongwei1; Li, Dianzhong1
Corresponding AuthorLiu, Hongwei(hwliu@imr.ac.cn) ; Li, Dianzhong(dzli@imr.ac.cn)
2021-04-01
Source PublicationMATERIALS CHARACTERIZATION
ISSN1044-5803
Volume174Pages:14
AbstractBased 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.
KeywordBearing steel Primary carbide Segregation Solidification MC M2C
Funding OrganizationNational 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
DOI10.1016/j.matchar.2021.111011
Indexed BySCI
Language英语
Funding ProjectNational 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 Research AreaMaterials Science ; Metallurgy & Metallurgical Engineering
WOS SubjectMaterials Science, Multidisciplinary ; Metallurgy & Metallurgical Engineering ; Materials Science, Characterization & Testing
WOS IDWOS:000640907100003
PublisherELSEVIER SCIENCE INC
Citation statistics
Cited Times:2[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.imr.ac.cn/handle/321006/162121
Collection中国科学院金属研究所
Corresponding AuthorLiu, Hongwei; Li, Dianzhong
Affiliation1.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
Recommended Citation
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.
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