Effect of internal nitridation on microstructure and mechanical properties of cobalt-based superalloy under high-temperature nitrogen atmosphere

doi:10.1016/j.matchar.2023.112851

IMR OpenIR

	Effect of internal nitridation on microstructure and mechanical properties of cobalt-based superalloy under high-temperature nitrogen atmosphere
	Chen, Yipeng 1,2; Cai, Yong 1; Yuan, Chao 2; Kong, Weiwen 1; Wang, Yongqiang 1,2; Wen, Xin 1,2; Liu, Xin 2
通讯作者	Yuan, Chao(ychao@imr.ac.cn)
	2023-06-01
发表期刊	MATERIALS CHARACTERIZATION
ISSN	1044-5803
卷号	200 页码:14
摘要	In this study, the microstructure and mechanical properties of cobalt-based superalloys by internal nitridation at 1100 degrees C, 1150 degrees C, and 1200 degrees C were characterised in detail by transmission electron microscope (TEM), electron probe microanalysis (EPMA), electron backscatter diffraction (EBSD) and microhardness testing. The results show that with an increase in the internal nitridation temperature, the nitridation layer thickness of cobalt-based superalloys gradually increases to 898 & mu;m. Internal nitridation at 1200 degrees C for 10 h exhibits the densest nitrides and the thickest layer. The precipitates were then dispersed in the matrix. The precipitates are mainly cubic, spherical, and cruciform (Ti, Nb)(C, N). Small amounts of blocky AlN and Cr2N were observed in the outer nitridation layer. Internal nitridation significantly improves the mechanical properties of cobalt-based superalloys by precipitation and solution strengthening. The yield strength increased by 105 % at room temperature (RT). Compared with the yield strength of 100 MPa for the as-received alloy at 800 degrees C, the internal nitridation alloy could still maintain good mechanical properties: a yield strength 300 MPa and an elongation 32%. In addition, because of the low diffusion activation energy of nitrogen in cobalt-based superalloys, internal nitridation is suitable for strengthening cobalt-based superalloys, expanding their application prospects in engineering structural materials.
关键词	Cobalt-based superalloy Internal nitridation Nitridation kinetics analysis Microstructure evolution
DOI	10.1016/j.matchar.2023.112851
收录类别	SCI
语种	英语
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:001058270700001
出版者	ELSEVIER SCIENCE INC
引用统计	被引频次：5[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/321006/179012
专题	中国科学院金属研究所
通讯作者	Yuan, Chao
作者单位	1.Univ Sci & Technol China, Sch Mat Sci & Engn, Shenyang 110016, Peoples R China 2.Chinese Acad Sci, Inst Met Res, Shenyang Natl Lab Mat Sci, Shenyang 110016, Peoples R China
推荐引用方式 GB/T 7714	Chen, Yipeng,Cai, Yong,Yuan, Chao,et al. Effect of internal nitridation on microstructure and mechanical properties of cobalt-based superalloy under high-temperature nitrogen atmosphere[J]. MATERIALS CHARACTERIZATION,2023,200:14.
APA	Chen, Yipeng.,Cai, Yong.,Yuan, Chao.,Kong, Weiwen.,Wang, Yongqiang.,...&Liu, Xin.(2023).Effect of internal nitridation on microstructure and mechanical properties of cobalt-based superalloy under high-temperature nitrogen atmosphere.MATERIALS CHARACTERIZATION,200,14.
MLA	Chen, Yipeng,et al."Effect of internal nitridation on microstructure and mechanical properties of cobalt-based superalloy under high-temperature nitrogen atmosphere".MATERIALS CHARACTERIZATION 200(2023):14.