A study on microstructure evolution of MCrAlY coatings after thermal aging in Te environment

doi:10.1016/j.surfcoat.2024.131490

IMR OpenIR

	A study on microstructure evolution of MCrAlY coatings after thermal aging in Te environment
	Wu, Jijin 1,2; Han, Fenfen 1,2; Jiang, Sumeng 3; Li, Wei 3; Ji, Weichi 1,4; Huang, Hefei 1,2
通讯作者	Han, Fenfen(hanfenfen@sinap.ac.cn) ; Huang, Hefei(huanghefei@sinap.ac.cn)
	2024-10-30
发表期刊	SURFACE & COATINGS TECHNOLOGY
ISSN	0257-8972
卷号	494 页码:13
摘要	The effects of thermal exposure on tellurium (Te) diffusion behavior in MCrAlY coatings were investigated at 800 degrees C in Te vapor. The results showed that the diffusion depth of Te in MCrAlY coatings gradually increased with the exposure time, and the dense Cr3Te4 layer formed on the coating surface in the initial stage was no longer continuous, especially under aging conditions with higher Te concentration. The high Cr content of the coating promoted the solid phase transition of the surface reaction product from Cr3Te4 to Cr7Te8, and resulting in the formation of large alpha-Cr phase either within or beneath the reaction layer during long aging processes. As a result of this phase transition, excess Te atoms were released from Cr3Te4 and continued to diffuse into the coating. Te did not exhibit obvious intergranular diffusion characteristics within the coating. When it encountered Y, it was captured by Y and formed a YTe phase. After aging for 3000 h, Te was distributed throughout the coating, and numerous voids were formed at the interface between the coating and the substrate. These two factors deteriorated the plasticity and adhesion of the coating. Results from molten salt corrosion tests indicated that the high content of Cr and Al in the coating, as well as high densities of grain boundaries providing diffusion pathways, reduced the corrosion resistance of the coating to molten salt.
关键词	GH3535 alloy MCrAlY coating Tellurium diffusion Intergranular embrittlement Molten salt reactors
资助者	National Natural Science Foundation of China
DOI	10.1016/j.surfcoat.2024.131490
收录类别	SCI
语种	英语
资助项目	National Natural Science Foundation of China[12425511] ; National Natural Science Foundation of China[12375280] ; National Natural Science Foundation of China[U2341261]
WOS研究方向	Materials Science ; Physics
WOS类目	Materials Science, Coatings & Films ; Physics, Applied
WOS记录号	WOS:001343596100001
出版者	ELSEVIER SCIENCE SA
引用统计
文献类型	期刊论文
条目标识符	http://ir.imr.ac.cn/handle/321006/190917
专题	中国科学院金属研究所
通讯作者	Han, Fenfen; Huang, Hefei
作者单位	1.Chinese Acad Sci, Shanghai Inst Appl Phys, Shanghai 201800, Peoples R China 2.Univ Chinese Acad Sci, Beijing 100049, Peoples R China 3.Chinese Acad Sci, Inst Met Res, Shenyang 110016, Peoples R China 4.ShanghaiTech Univ, Sch Phys Sci & Technol, Shanghai 201210, Peoples R China
推荐引用方式 GB/T 7714	Wu, Jijin,Han, Fenfen,Jiang, Sumeng,et al. A study on microstructure evolution of MCrAlY coatings after thermal aging in Te environment[J]. SURFACE & COATINGS TECHNOLOGY,2024,494:13.
APA	Wu, Jijin,Han, Fenfen,Jiang, Sumeng,Li, Wei,Ji, Weichi,&Huang, Hefei.(2024).A study on microstructure evolution of MCrAlY coatings after thermal aging in Te environment.SURFACE & COATINGS TECHNOLOGY,494,13.
MLA	Wu, Jijin,et al."A study on microstructure evolution of MCrAlY coatings after thermal aging in Te environment".SURFACE & COATINGS TECHNOLOGY 494(2024):13.