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Dislocation climbing dominated decomposition and fracture of carbides in a Ni-based superalloy

文献类型：期刊论文

作者Ge, Hualong3,5; Liu, Guisen1; Zheng, Shijian3,4; Yang, Yaqian2; Liu, Kui2; Ma, Xiuliang3
刊名ACTA MATERIALIA
出版日期2023-03-01
卷号246页码:12
关键词Superalloy Carbide Dislocation Creep
ISSN号1359-6454
DOI10.1016/j.actamat.2023.118669
通讯作者Zheng, Shijian(sjzheng@hebut.edu.cn) ; Ma, Xiuliang(xlma@imr.ac.cn)
英文摘要Metal carbides (MC) are typical strengthening phases in steels and superalloys. However, the decomposition of carbides can occur during high-temperature creep, which is generally considered to be detrimental to the hightemperature performance of superalloys. Here, through transmission electron microscopy and atomistic simulation, we report the atomistic to micro-scale mechanisms of MC decomposition. We identify that MC can deform plastically during high-temperature creep, which is supported by the observation of high-density dislocations within MC and steps at matrix/MC interfaces. This could release the stress concentration at the matrix/MC interfaces, thus improving the creep resistance. With Cr segregation along the dislocation line and continuous dislocation climb, decomposition of MC into M23C6 occurs in grain interiors, which could lead to crack inside the MC carbides, i.e., fracture at the partially coherent M23C6/MC interfaces. This is new to the existing knowledge that MC decomposition and fracture occur at matrix/MC interfaces.
资助项目National Natural Science Foundation of China[51771201] ; National Natural Science Foundation of China[52071124] ; National Natural Science Foundation of China[51801122] ; Natural Science Foundation of Hebei[E2021202135] ; key project of Natural Science Foundation of Tianjin[20JCZDJC00440] ; State Key Laboratory of Rolling and Automation, Northeastern University[2020RALKFKT002]
WOS研究方向Materials Science ; Metallurgy & Metallurgical Engineering
语种英语
WOS记录号WOS:000919624200001
出版者PERGAMON-ELSEVIER SCIENCE LTD
资助机构National Natural Science Foundation of China ; Natural Science Foundation of Hebei ; key project of Natural Science Foundation of Tianjin ; State Key Laboratory of Rolling and Automation, Northeastern University
源URL[http://ir.imr.ac.cn/handle/321006/175350]  
专题金属研究所_中国科学院金属研究所
通讯作者Zheng, Shijian; Ma, Xiuliang
作者单位1.Shanghai Jiao Tong Univ, Sch Mat Sci & Engn, Shanghai 200240, Peoples R China
2.Chinese Acad Sci, Inst Met Res, Shi Changxu Innovat Ctr Adv Mat, Shenyang 110016, Peoples R China
3.Chinese Acad Sci, Inst Met Res, Shenyang Natl Lab Mat Sci, Shenyang 110016, Peoples R China
4.Hebei Univ Technol, Sch Mat Sci & Engn, Tianjin Key Lab Mat Laminating Fabricat & Interfac, Tianjin 300130, Peoples R China
5.Yunnan Univ, Mat Genome Inst, Sch Mat & Energy, Kunming 650500, Peoples R China
推荐引用方式
GB/T 7714		 Ge, Hualong,Liu, Guisen,Zheng, Shijian,et al. Dislocation climbing dominated decomposition and fracture of carbides in a Ni-based superalloy[J]. ACTA MATERIALIA,2023,246:12.
APA Ge, Hualong,Liu, Guisen,Zheng, Shijian,Yang, Yaqian,Liu, Kui,&Ma, Xiuliang.(2023).Dislocation climbing dominated decomposition and fracture of carbides in a Ni-based superalloy.ACTA MATERIALIA,246,12.
MLA Ge, Hualong,et al."Dislocation climbing dominated decomposition and fracture of carbides in a Ni-based superalloy".ACTA MATERIALIA 246(2023):12.

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来源：金属研究所

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