Effect of hafnium content on the microstructural evolution and stress rupture properties of K4750 nickel-based superalloy

doi:10.1016/j.jallcom.2022.165473

IMR OpenIR

	Effect of hafnium content on the microstructural evolution and stress rupture properties of K4750 nickel-based superalloy
	Ou, Meiqiong; Ma, Yingche; Hou, Kunlei; Liu, Kui
通讯作者	Ma, Yingche(ycma@imr.ac.cn)
	2022-09-25
发表期刊	JOURNAL OF ALLOYS AND COMPOUNDS
ISSN	0925-8388
卷号	916 页码:12
摘要	The microstructural evolution of K4750 nickel-based superalloy with different hafnium (Hf) contents was investigated by thermodynamic calculations (TC) and experiments. According to TC, with the increases of Hf content from 0 wt% to 1.5 wt%, the redissolving temperature of MC carbide first decreased rapidly and then tended to be relatively stable, the precipitated temperature of M23C6 carbide decreased gradually, while the gamma ' weight fraction increased first and then stabilized. Three alloys containing 0 wt%, 0.11 wt%, and 0.28 wt% Hf were then prepared to further study the evolution of the microstructure. The experimental results showed that the increase of Hf content changed the morphology of MC carbide from long strip to rodlike and blocky, which is caused by the decrease of Ti and Nb contents and the increase of Hf content in MC carbides. The addition of Hf also changed the morphology of M23C6 carbide from continuous to granular due to the different MC distribution at grain boundaries (GBs). In addition, a small amount of Hf segregated into the gamma ' phase, reducing the Al and Nb contents of the gamma ' phase, resulting in an increased gamma/gamma ' lattice mismatch. As the Hf content increased from 0 wt% to 0.11 wt% and 0.28 wt%, the mean stress rupture life at 750 degrees C and 430 MPa increased from 99.54 h to 105.73 h and 170.96 h, which was closely related to the evolution of MC, M23C6 and gamma ' precipitates. Therefore, the relationship between microstructure and stress rupture properties was discussed in detail.
关键词	Nickel-based superalloy Hf addition MC carbide M-23 C-6 carbide ?? phase Stress rupture properties
资助者	National Natural Science Foundation of China ; Natural Science Foundation of Liaoning Province of China
DOI	10.1016/j.jallcom.2022.165473
收录类别	SCI
语种	英语
资助项目	National Natural Science Foundation of China[52001314] ; Natural Science Foundation of Liaoning Province of China[2020-BS-0 08]
WOS研究方向	Chemistry ; Materials Science ; Metallurgy & Metallurgical Engineering
WOS类目	Chemistry, Physical ; Materials Science, Multidisciplinary ; Metallurgy & Metallurgical Engineering
WOS记录号	WOS:000806925600003
出版者	ELSEVIER SCIENCE SA
引用统计	被引频次：14[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/321006/174246
专题	中国科学院金属研究所
通讯作者	Ma, Yingche
作者单位	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	Ou, Meiqiong,Ma, Yingche,Hou, Kunlei,et al. Effect of hafnium content on the microstructural evolution and stress rupture properties of K4750 nickel-based superalloy[J]. JOURNAL OF ALLOYS AND COMPOUNDS,2022,916:12.
APA	Ou, Meiqiong,Ma, Yingche,Hou, Kunlei,&Liu, Kui.(2022).Effect of hafnium content on the microstructural evolution and stress rupture properties of K4750 nickel-based superalloy.JOURNAL OF ALLOYS AND COMPOUNDS,916,12.
MLA	Ou, Meiqiong,et al."Effect of hafnium content on the microstructural evolution and stress rupture properties of K4750 nickel-based superalloy".JOURNAL OF ALLOYS AND COMPOUNDS 916(2022):12.