Microstructural modification and mechanical characterization for a laser-induced composite coating during thermal exposure

doi:10.1015/j.surfcoat.2018.10.091

CORC > 金属研究所 > 中国科学院金属研究所

	Microstructural modification and mechanical characterization for a laser-induced composite coating during thermal exposure
	He, Yanming 1,3; Lu, Chuanyang 3; Zheng, Wenjian 3; Yang, Jianguo 3; Chen, Shuangjian 4; Li, Zhijun 4; Sun, Yuan 2; Gao, Zengliang 3
刊名	SURFACE & COATINGS TECHNOLOGY
	2019-01-25
卷号	358 页码:11-21
关键词	Nickel based superalloys Laser cladding Aging Microstructure Mechanical property
ISSN号	0257-8972
DOI	10.1015/j.surfcoat.2018.10.091
通讯作者	Zheng, Wenjian(zwj0322@zjut.edu.cn) ; Sun, Yuan(yuansun@imr.ac.cn)
英文摘要	In this work, a composite coating prepared by laser cladding on a Ni-17Mo-7Cr based superalloy was thermally exposed at 1073 K for 240 h. A detailed electron microscopy examination was performed to characterize the microstructure of the aged coating. Results indicate that: the original Mo6Ni6C dendrites in the aged coating were coarsened while the coarsening layers were essentially the Mo-deficient and Cr-rich Mo6Ni6C, due to low diffusivity of Mo. Long-term thermal exposure promoted a great amount of nano-sized Mo6Ni6C and micro-sized Cr3C2 particles being precipitated in the interdendritic zones. In the aged coating, three types of Cr3C2 were presented: discrete Cr3C2, Cr3C2 close to the graphite and Cr3C2 approaching to the Mo6Ni6C. The transformation of Mo6Ni6C to Cr3C2 merely occurred in the newly formed Mo6Ni6C rather than in the original Mo6Ni6C dendrites, because deficiency of Mo and enrichment of Cr in the new Mo6Ni6C depressed their stability. Lastly, the mechanical behavior of the aged coating was characterized by Vickers hardness, nano-indentation and nano scratch tests with the aim to unveil the effect of microstructural evolution on mechanical properties. Our findings provide basic information to understand the aged-induced microstructural modification and its effect on mechanical properties for a laser-induced coating prepared on the Ni-17Mo-7Cr based superalloy. The results obtained cannot only apply to the investigated Ni-based superalloys, but also to other Hastelloy series superalloys.
资助项目	National Natural Science Foundation of China[51475426] ; National Natural Science Foundation of China[51405439] ; Natural Science Foundation of Zhejiang Province[LY17E050019]
WOS研究方向	Materials Science ; Physics
语种	英语
出版者	ELSEVIER SCIENCE SA
WOS记录号	WOS:000456762300002
资助机构	National Natural Science Foundation of China ; Natural Science Foundation of Zhejiang Province
内容类型	期刊论文
源URL	[http://ir.imr.ac.cn/handle/321006/131249]
专题	金属研究所_中国科学院金属研究所
通讯作者	Zheng, Wenjian; Sun, Yuan
作者单位	1.Northwestern Univ, Dept Mat Sci & Engn, 2220 Campus Dr, Evanston, IL 60208 USA 2.Chinese Acad Sci, Inst Met Res, Dept Superalloy, Shenyang 110016, Peoples R China 3.Zhejiang Univ Technol, Inst Proc Equipment & Control Engn, Hangzhou 310014, Zhejiang, Peoples R China 4.Chinese Acad Sci, Shanghai Inst Appl Phys, Shanghai 201800, Peoples R China
推荐引用方式 GB/T 7714	He, Yanming,Lu, Chuanyang,Zheng, Wenjian,et al. Microstructural modification and mechanical characterization for a laser-induced composite coating during thermal exposure[J]. SURFACE & COATINGS TECHNOLOGY,2019,358:11-21.
APA	He, Yanming.,Lu, Chuanyang.,Zheng, Wenjian.,Yang, Jianguo.,Chen, Shuangjian.,...&Gao, Zengliang.(2019).Microstructural modification and mechanical characterization for a laser-induced composite coating during thermal exposure.SURFACE & COATINGS TECHNOLOGY,358,11-21.
MLA	He, Yanming,et al."Microstructural modification and mechanical characterization for a laser-induced composite coating during thermal exposure".SURFACE & COATINGS TECHNOLOGY 358(2019):11-21.