Stress-induced influence on the evolution of γ′ phase in dendritic area during long-term stress aging at 900 °C in Ni-based superalloy K444

doi:10.1016/j.matchar.2023.113549

IMR OpenIR

	Stress-induced influence on the evolution of γ′ phase in dendritic area during long-term stress aging at 900 °C in Ni-based superalloy K444
	Cai, Hang 1,2; Hou, Jieshan 1; Xing, Jing 1,2; Yang, Fenqi 3; Liu, Zitong 3; Zhou, Lan-Zhang 1
通讯作者	Hou, Jieshan(jshou@imr.ac.cn) ; Zhou, Lan-Zhang(lzz@imr.ac.cn)
	2024
发表期刊	MATERIALS CHARACTERIZATION
ISSN	1044-5803
卷号	207 页码:10
摘要	The evolution of gamma ' phase in the Ni-based superalloy K444 alloy is investigated after long-term aging for 5000 h (LTA5,000) at 900 degrees C under different stresses (0 MPa, 50 MPa, 65 MPa, 80 MPa, 100 MPa and 120 MPa). The role of applied stress in the LTA5,000 process is analyzed in detail from multiple aspects, including morphology, composition partition, the formation of TCP phase, lattice misfit (delta) and dislocations configuration. The results reveal that the stress promotes the gamma ' phase directional coarsening when it exceeds the critical value. For this alloy, the rafting structure is obvious when the stress is higher than 80 MPa, while gamma ' phases maintain cuboid shape when the stress is below 65 MPa. It is caused by the stress gradient in the gamma channels which accelerates the gamma ' forming elements diffuse from horizontal gamma channels to the vertical channels and only sufficient stress can activate the directional diffusion behavior. Besides, the stress induces that Al and Ti strongly assign to gamma ' phases and the concentration of Cr in gamma matrix increases clearly. In addition, the sigma-TCP is free until the applied stress raises to 120 MPa, it is attributed to the increase in Cr concentration in the gamma matrix. Moreover, the value of vertical bar delta vertical bar increases as the applied stress increases, and reducing interfacial energy becomes the driving force for directional coarsening. Finally, the calculated results based on the threshold stress demonstrate that the dislocations climb over the gamma ' particles within the range of 65 MPa similar to 120 MPa, which is in agreement with the observed phenomena.
关键词	Ni-based superalloy Long-term stress aging Microstructure evolution TCP phase Threshold stress
资助者	National Science and Technology Major Project ; National Natural Science Foundation of China (NSFC)
DOI	10.1016/j.matchar.2023.113549
收录类别	SCI
语种	英语
资助项目	National Science and Technology Major Project[Y2019-VII-001 1-0151] ; National Natural Science Foundation of China (NSFC)[51571191]
WOS研究方向	Materials Science ; Metallurgy & Metallurgical Engineering
WOS类目	Materials Science, Multidisciplinary ; Metallurgy & Metallurgical Engineering ; Materials Science, Characterization & Testing
WOS记录号	WOS:001156550800001
出版者	ELSEVIER SCIENCE INC
引用统计	被引频次：4[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/321006/184137
专题	中国科学院金属研究所
通讯作者	Hou, Jieshan; Zhou, Lan-Zhang
作者单位	1.Chinese Acad Sci, Inst Met Res, Shenyang 110016, Peoples R China 2.Univ Sci & Technol China, Sch Mat Sci & Engn, Hefei 230026, Peoples R China 3.Shenyang Ligong Univ, Coll Mat Sci & Engn, Shenyang 110016, Peoples R China
推荐引用方式 GB/T 7714	Cai, Hang,Hou, Jieshan,Xing, Jing,等. Stress-induced influence on the evolution of γ′ phase in dendritic area during long-term stress aging at 900 °C in Ni-based superalloy K444[J]. MATERIALS CHARACTERIZATION,2024,207:10.
APA	Cai, Hang,Hou, Jieshan,Xing, Jing,Yang, Fenqi,Liu, Zitong,&Zhou, Lan-Zhang.(2024).Stress-induced influence on the evolution of γ′ phase in dendritic area during long-term stress aging at 900 °C in Ni-based superalloy K444.MATERIALS CHARACTERIZATION,207,10.
MLA	Cai, Hang,et al."Stress-induced influence on the evolution of γ′ phase in dendritic area during long-term stress aging at 900 °C in Ni-based superalloy K444".MATERIALS CHARACTERIZATION 207(2024):10.