Precipitation behavior of sigma phase and its influence on mechanical properties of a Ni-Fe based alloy

doi:10.1016/j.jallcom.2019.01.048

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	Precipitation behavior of sigma phase and its influence on mechanical properties of a Ni-Fe based alloy
	Wang, Changshuai; Wu, Yunsheng; Guo, YongAn; Guo, Jianting; Zhou, Lanzhang
刊名	JOURNAL OF ALLOYS AND COMPOUNDS
	2019-05-05
卷号	784 页码:266-275
关键词	Sigma (sigma) phase Precipitation behavior Ni-Fe based alloy Tensile properties Stress rupture properties
ISSN号	0925-8388
DOI	10.1016/j.jallcom.2019.01.048
通讯作者	Wang, Changshuai(cswang@imr.ac.cn) ; Zhou, Lanzhang(lzz@imr.ac.cn)
英文摘要	Precipitation behavior of sigma (sigma) phase of a Ni-Fe based alloy, considered as boiler materials in advanced ultra-supercritical (A-USC) coal-fired power plants, was investigated during thermal exposure at 650-800 degrees C for up to 40000 h with and without applied stress. Moreover, its influence on mechanical properties was clarified. During thermal exposure without applied stress, the plate-like sigma phase precipitates directly in the grain, enriches in Ni, Fe, Cr and Mo and has tetragonal structure. Stress promotes the precipitation of sigma phase. The incubation stage, rapid growth stage and near-equilibrium can be clearly distinguished during the precipitation process. At the incubation stage, the most visible change is the increase of sigma density, but a pronounced increase appears regarding the density and size of sigma phase at the rapid growth stage. The incubation and rapid growth stages of sigma phase are controlled by interface and the preferential growth is in two directions, but it is related to diffusional-controlled growth at near-equilibrium stage. sigma phase slightly reduces the tensile strength because of the crack initiation at gamma/sigma interface, but has no obvious influence on ductility. sigma phase drastically decreases stress rupture life, but improve ductility by depleting strengthening elements in gamma matrix. (C) 2019 Elsevier B.V. All rights reserved.
资助项目	National Key Research and Development Program of China[2017YFB0305204] ; National Energy Administration Program of China[NY20150102] ; National Natural Science Foundation of China[51301171] ; Science and Technology Program of Sichuan Province[2016JZ0036]
WOS研究方向	Chemistry ; Materials Science ; Metallurgy & Metallurgical Engineering
语种	英语
出版者	ELSEVIER SCIENCE SA
WOS记录号	WOS:000459796400031
资助机构	National Key Research and Development Program of China ; National Energy Administration Program of China ; National Natural Science Foundation of China ; Science and Technology Program of Sichuan Province
内容类型	期刊论文
源URL	[http://ir.imr.ac.cn/handle/321006/132145]
专题	金属研究所_中国科学院金属研究所
通讯作者	Wang, Changshuai; Zhou, Lanzhang
作者单位	Chinese Acad Sci, Inst Met Res, Shenyang 110016, Liaoning, Peoples R China
推荐引用方式 GB/T 7714	Wang, Changshuai,Wu, Yunsheng,Guo, YongAn,et al. Precipitation behavior of sigma phase and its influence on mechanical properties of a Ni-Fe based alloy[J]. JOURNAL OF ALLOYS AND COMPOUNDS,2019,784:266-275.
APA	Wang, Changshuai,Wu, Yunsheng,Guo, YongAn,Guo, Jianting,&Zhou, Lanzhang.(2019).Precipitation behavior of sigma phase and its influence on mechanical properties of a Ni-Fe based alloy.JOURNAL OF ALLOYS AND COMPOUNDS,784,266-275.
MLA	Wang, Changshuai,et al."Precipitation behavior of sigma phase and its influence on mechanical properties of a Ni-Fe based alloy".JOURNAL OF ALLOYS AND COMPOUNDS 784(2019):266-275.