Phase precipitation behavior and its influence on mechanical properties of a solid-solution strengthened Ni-based alloy

doi:10.1016/j.jallcom.2022.167482

IMR OpenIR

	Phase precipitation behavior and its influence on mechanical properties of a solid-solution strengthened Ni-based alloy
	Wang, Changshuai 1; Zhang, Fengzhi 1,2; Wu, Yunsheng 1; Zhou, Lanzhang 1
通讯作者	Wang, Changshuai(cswang@imr.ac.cn) ; Zhou, Lanzhang(lzz@imr.ac.cn)
	2023-01-10
发表期刊	JOURNAL OF ALLOYS AND COMPOUNDS
ISSN	0925-8388
卷号	931 页码:12
摘要	Phase precipitation behavior and its influence on mechanical properties of a solid-solution strengthened Ni-based alloy, used to manufacture large casting components in next generation of advanced ultra -super-critical coal fired power plant, were studied during exposure at 700 degrees C for up to 30,000 h. Detailed analysis reveals that only MC carbide exists in solution annealed alloy. During thermal exposure, gamma '', delta and M23C6 carbide precipitate, but gamma '' and MC carbide are metastable phases. gamma '' precipitation precedes delta phase, but it disappears gradually with the precipitation of delta phase. MC carbide gradually degenerates via reaction MC + gamma -> M23C6 + delta. delta phase first precipitates at grain boundary due to the segregation of Nb at grain boundary and M23C6/gamma interface, then tends to form in the vicinity of MC carbide and then appears in the inter-dendritic region. Its growth expends gamma '' phase or MC carbide. Finally, the precipitation-free zone forms in the dendrite core region. The variation trend of yield strength can be divided into three stages during thermal exposure. It first increases drastically, then increases gradually, and then keeps almost constant. gamma '' phase has a major contribution in first stage, but delta phase gradually becomes the primarily strengthened phase. The elongation decreases steeply at early stage and then has no significant change. After thermal exposure, the impact toughness at room temperature also decreases drastically. The major influence factors of elongation and impact toughness are the increase of grain interior strength and the film-like M23C6 carbide.(c) 2022 Elsevier B.V. All rights reserved.
关键词	Ni-based alloy &gamma &prime phase ? phase Carbides Mechanical properties
资助者	National Key Research and Development Program of China ; National Natural Science Foundation of China
DOI	10.1016/j.jallcom.2022.167482
收录类别	SCI
语种	英语
资助项目	National Key Research and Development Program of China ; National Natural Science Foundation of China ; [2021YFB3704103] ; [51971216] ; [51301171]
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:000883740400001
出版者	ELSEVIER SCIENCE SA
引用统计	被引频次：8[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/321006/176740
专题	中国科学院金属研究所
通讯作者	Wang, Changshuai; 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, Hefei 230026, Peoples R China
推荐引用方式 GB/T 7714	Wang, Changshuai,Zhang, Fengzhi,Wu, Yunsheng,et al. Phase precipitation behavior and its influence on mechanical properties of a solid-solution strengthened Ni-based alloy[J]. JOURNAL OF ALLOYS AND COMPOUNDS,2023,931:12.
APA	Wang, Changshuai,Zhang, Fengzhi,Wu, Yunsheng,&Zhou, Lanzhang.(2023).Phase precipitation behavior and its influence on mechanical properties of a solid-solution strengthened Ni-based alloy.JOURNAL OF ALLOYS AND COMPOUNDS,931,12.
MLA	Wang, Changshuai,et al."Phase precipitation behavior and its influence on mechanical properties of a solid-solution strengthened Ni-based alloy".JOURNAL OF ALLOYS AND COMPOUNDS 931(2023):12.