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Role of carbon in modifying solidification and microstructure of a Ni-based superalloy with high Al and Ti contents
Zhao, Guang-di1; Zang, Xi-min1; Sun, Wen-ru2
Corresponding AuthorZhao, Guang-di(gdzhao12s@alum.imr.ac.cn)
2020-04-28
Source PublicationJOURNAL OF IRON AND STEEL RESEARCH INTERNATIONAL
ISSN1006-706X
Pages13
AbstractThe effect of carbon ranging from 0.014 to 0.071 wt.% on the solidification and microstructure of a Ni-based superalloy with high Al and Ti contents was studied. The results show that the increase in carbon addition significantly increases the size and volume fraction of MC carbides and promotes the change of their morphology from blocky to elongated shape. However, the carbon addition obviously decreases the size and volume fraction of eutectic (gamma + gamma ') and reduces eta phase and borides formation. The change in carbide characteristics is mainly because of the increasing carbide-forming element and carbides precipitation temperature with the increase in carbon which favors the growth of them along the interdendritic liquid film. MC carbides are formed at an earlier solidification stage than the eutectic (gamma + gamma '). The increased carbide formation consumes more Ti, which delays and reduces the eutectic (gamma + gamma ') precipitation. The delay of eutectic (gamma + gamma ') precipitation leads to a deeper undercooling, which significantly decreases the critical Ti concentration for its precipitation. This, in turn, lowers Ti/Al ratio in residual liquids ahead of the eutectic (gamma + gamma ') and hence reduces eta formation subsequently. B and Zr are slightly enriched in the carbides, which are considered during discussing how carbon influences the eutectic (gamma + gamma ') precipitation.
KeywordCarbon Ni-based superalloy Solidification Segregation Eutectic (gamma plus gamma ') MC carbide
Funding OrganizationNational Natural Science Foundation of China ; Doctor Start-up Fund of Liaoning Province
DOI10.1007/s42243-020-00408-x
Indexed BySCI
Language英语
Funding ProjectNational Natural Science Foundation of China[51904146] ; National Natural Science Foundation of China[U1960203] ; Doctor Start-up Fund of Liaoning Province[2019-BS-125]
WOS Research AreaMetallurgy & Metallurgical Engineering
WOS SubjectMetallurgy & Metallurgical Engineering
WOS IDWOS:000529464700001
PublisherSPRINGER
Citation statistics
Document Type期刊论文
Identifierhttp://ir.imr.ac.cn/handle/321006/138610
Collection中国科学院金属研究所
Corresponding AuthorZhao, Guang-di
Affiliation1.Univ Sci & Technol Liaoning, Sch Mat & Met, Anshan 114051, Liaoning, Peoples R China
2.Chinese Acad Sci, Inst Met Res, Shenyang 110016, Liaoning, Peoples R China
Recommended Citation
GB/T 7714
Zhao, Guang-di,Zang, Xi-min,Sun, Wen-ru. Role of carbon in modifying solidification and microstructure of a Ni-based superalloy with high Al and Ti contents[J]. JOURNAL OF IRON AND STEEL RESEARCH INTERNATIONAL,2020:13.
APA Zhao, Guang-di,Zang, Xi-min,&Sun, Wen-ru.(2020).Role of carbon in modifying solidification and microstructure of a Ni-based superalloy with high Al and Ti contents.JOURNAL OF IRON AND STEEL RESEARCH INTERNATIONAL,13.
MLA Zhao, Guang-di,et al."Role of carbon in modifying solidification and microstructure of a Ni-based superalloy with high Al and Ti contents".JOURNAL OF IRON AND STEEL RESEARCH INTERNATIONAL (2020):13.
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