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Effect of Zr on solidification segregation behavior of K417G alloy and its anomalous effect during rapid cooling process
Qi, Feng1,2; Yu, Lianxu3; Zhao, Guangdi4; Xin, Xin2; Zhang, Bin1; Sun, Wenru2
Corresponding AuthorSun, Wenru(wrsun@imr.ac.cn)
2020-09-15
Source PublicationJOURNAL OF ALLOYS AND COMPOUNDS
ISSN0925-8388
Volume835Pages:9
AbstractAlthough Zr is classified as a beneficial element in superalloys, it noticeably increases the solidification segregation, worsens the as cast microstructure and lowers the melting point of the superalloys, but the detailed information about the behavior of Zr during the solidification remains unknown till now. In this paper, some evidences supporting the assumption that a film of Zr formed at the solid/liquid interface during solidification have been found, including the precipitation of ZrC, Zr-2 (SC) and Ni-Zr phases at the grain boundary or eutectic (gamma+ gamma') front, and the concentration of Zr at the crack surface formed at the final stage of the K417G alloy solidification. The Zr-rich film at the solid/liquid interface markedly lowers the solidification rate of K417G alloy, and decreases the content of Al, Ti, Cr and Mo in the dendrite core. As a result, the precipitation of (gamma+ gamma') eutectic is largely increased. Under water quenching conditions, the solidification of the final liquids contains two sequential eutectic reaction, including the (gamma+ gamma') at the external part of the liquid pool and the (gamma + carbide) reaction at the central part of the liquid pool. Zr inhibits the second reaction and increases the crack formation tendency, implying that it would damage the weldability of the alloy. (C) 2020 Elsevier B.V. All rights reserved.
KeywordZirconium Solidification (gamma plus gamma ') eutectic K417G
DOI10.1016/j.jallcom.2020.155243
Indexed BySCI
Language英语
WOS Research AreaChemistry ; Materials Science ; Metallurgy & Metallurgical Engineering
WOS SubjectChemistry, Physical ; Materials Science, Multidisciplinary ; Metallurgy & Metallurgical Engineering
WOS IDWOS:000546685800022
PublisherELSEVIER SCIENCE SA
Citation statistics
Document Type期刊论文
Identifierhttp://ir.imr.ac.cn/handle/321006/139794
Collection中国科学院金属研究所
Corresponding AuthorSun, Wenru
Affiliation1.Northeastern Univ, Sch Mat Sci & Engn, Key Lab Anisotropy & Texture Mat, Minist Educ, Shenyang 110819, Peoples R China
2.Chinese Acad Sci, Inst Met Res, Shenyang 110016, Peoples R China
3.Chongqing Skyrizon Aeroengines Co Ltd, Tech Ctr, Chongqing 401135, Peoples R China
4.Univ Sci & Technol Liaoning, Sch Met & Mat, Anshan 114051, Peoples R China
Recommended Citation
GB/T 7714
Qi, Feng,Yu, Lianxu,Zhao, Guangdi,et al. Effect of Zr on solidification segregation behavior of K417G alloy and its anomalous effect during rapid cooling process[J]. JOURNAL OF ALLOYS AND COMPOUNDS,2020,835:9.
APA Qi, Feng,Yu, Lianxu,Zhao, Guangdi,Xin, Xin,Zhang, Bin,&Sun, Wenru.(2020).Effect of Zr on solidification segregation behavior of K417G alloy and its anomalous effect during rapid cooling process.JOURNAL OF ALLOYS AND COMPOUNDS,835,9.
MLA Qi, Feng,et al."Effect of Zr on solidification segregation behavior of K417G alloy and its anomalous effect during rapid cooling process".JOURNAL OF ALLOYS AND COMPOUNDS 835(2020):9.
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