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

doi:10.1016/j.actamat.2023.118669

IMR OpenIR

	Dislocation climbing dominated decomposition and fracture of carbides in a Ni-based superalloy
	Ge, Hualong 1,4; Liu, Guisen 3; Zheng, Shijian 1,2; Yang, Yaqian 5; Liu, Kui 5; Ma, Xiuliang 1
通讯作者	Zheng, Shijian(sjzheng@hebut.edu.cn) ; Ma, Xiuliang(xlma@imr.ac.cn)
	2023-03-01
发表期刊	ACTA MATERIALIA
ISSN	1359-6454
卷号	246 页码:12
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.
关键词	Superalloy Carbide Dislocation Creep
资助者	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
DOI	10.1016/j.actamat.2023.118669
收录类别	SCI
语种	英语
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
WOS类目	Materials Science, Multidisciplinary ; Metallurgy & Metallurgical Engineering
WOS记录号	WOS:000919624200001
出版者	PERGAMON-ELSEVIER SCIENCE LTD
引用统计	被引频次：46[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/321006/175351
专题	中国科学院金属研究所
通讯作者	Zheng, Shijian; Ma, Xiuliang
作者单位	1.Chinese Acad Sci, Inst Met Res, Shenyang Natl Lab Mat Sci, Shenyang 110016, Peoples R China 2.Hebei Univ Technol, Sch Mat Sci & Engn, Tianjin Key Lab Mat Laminating Fabricat & Interfac, Tianjin 300130, Peoples R China 3.Shanghai Jiao Tong Univ, Sch Mat Sci & Engn, Shanghai 200240, Peoples R China 4.Yunnan Univ, Mat Genome Inst, Sch Mat & Energy, Kunming 650500, Peoples R China 5.Chinese Acad Sci, Inst Met Res, Shi Changxu Innovat Ctr Adv Mat, Shenyang 110016, 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.