The effect of Hafnium on the microstructure and tensile property in a Ni-based superalloy

doi:10.1016/j.jmrt.2024.04.049

IMR OpenIR

	The effect of Hafnium on the microstructure and tensile property in a Ni-based superalloy
	Li, Linzi 1,2; Wu, Yunsheng 1,3; Hou, Jieshan 1,3; Gao, Shuang 4; Zhou, Lanzhang 1,3
通讯作者	Hou, Jieshan(jshou@imr.ac.cn) ; Zhou, Lanzhang(lzz@imr.ac.cn)
	2024-05-01
发表期刊	JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
ISSN	2238-7854
卷号	30 页码:2977-2985
摘要	The effects of Hafnium on the microstructure and tensile property of a Ni-based superalloy after solution heat treatment and long-term thermal exposure were investigated with field emission scanning electron microscope (FESEM), transmission electron microscopy (TEM), X-ray diffractometer (XRD). The results revealed reveal that Hf intensified intensifies the element segregation and promoted promotes the precipitation of MC carbide and honeycomb-like Ni5Hf phase in the as-cast alloy. The solid solution strengthening and second phase (MC) strengthening effects are both enhanced in the alloy doping 0.5 wt% Hf after solution heat treatment. Therefore, the tensile yield strength at 700 degrees C of the alloy with 0.5 wt% Hf is higher than that in the Hf-free alloy. Otherwise, a large amount of the low melting point Ni5Hf phases appear in the alloy with 0.8 wt% Hf. Ni5Hf phase is prone to become the crack initiation, which decreases diminishes the yield strength in the alloy with 0.8 wt% Hf. The addition of 0.5 wt% Hf can inhibit the formation of needle-like 6 phase at grain boundary due to the decrease of grain boundary energy and diffusion rate at grain boundary. Therefore, the 700 degrees C tensile strength and ductility increase simultaneously in the alloy with 0.5 wt% Hf after thermal exposure at 700 degrees C.
关键词	Hafnium Ni-based superalloy Tensile strength 6 phase Microstructure
资助者	National Natural Science Foundation of China
DOI	10.1016/j.jmrt.2024.04.049
收录类别	SCI
语种	英语
资助项目	National Natural Science Foundation of China[51571191]
WOS研究方向	Materials Science ; Metallurgy & Metallurgical Engineering
WOS类目	Materials Science, Multidisciplinary ; Metallurgy & Metallurgical Engineering
WOS记录号	WOS:001229756800003
出版者	ELSEVIER
引用统计
文献类型	期刊论文
条目标识符	http://ir.imr.ac.cn/handle/321006/186459
专题	中国科学院金属研究所
通讯作者	Hou, Jieshan; Zhou, Lanzhang
作者单位	1.Chinese Acad Sci, Inst Met Res, Shi Changxu Innovat Ctr Adv Mat, Shenyang 110016, Peoples R China 2.Univ Sci & Technol China, Sch Mat Sci & Engn, Shenyang 110016, Peoples R China 3.Chinese Acad Sci, Inst Met Res, CAS Key Lab Nucl Mat & Safety Assessment, Shenyang 110016, Peoples R China 4.Shanghai Univ Engn Sci, Sch Mat Engn, Shanghai 201620, Peoples R China
推荐引用方式 GB/T 7714	Li, Linzi,Wu, Yunsheng,Hou, Jieshan,et al. The effect of Hafnium on the microstructure and tensile property in a Ni-based superalloy[J]. JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T,2024,30:2977-2985.
APA	Li, Linzi,Wu, Yunsheng,Hou, Jieshan,Gao, Shuang,&Zhou, Lanzhang.(2024).The effect of Hafnium on the microstructure and tensile property in a Ni-based superalloy.JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T,30,2977-2985.
MLA	Li, Linzi,et al."The effect of Hafnium on the microstructure and tensile property in a Ni-based superalloy".JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T 30(2024):2977-2985.