Effect of Cr content on the microstructural stability and impact-toughness evolution of a Ni-Fe-based weld metal

doi:10.1016/j.jallcom.2018.03.314

CORC > 金属研究所 > 中国科学院金属研究所

	Effect of Cr content on the microstructural stability and impact-toughness evolution of a Ni-Fe-based weld metal
	Wu, Dong 1,2; Li, Dianzhong 3; Lu, Shanping 1,3
刊名	JOURNAL OF ALLOYS AND COMPOUNDS
	2018-06-15
卷号	749 页码:465-472
关键词	Metal Grain boundaries Scanning and transmission electron microscopy X-ray diffraction High temperature alloys
ISSN号	0925-8388
DOI	10.1016/j.jallcom.2018.03.314
通讯作者	Lu, Shanping(shplu@imr.ac.cn)
英文摘要	Microstructural stability and impact-toughness evolution of a Ni-Fe-based weld metal with different Cr contents was investigated during long-term thermal exposures up to 10000 h at 700 degrees C. With an increase in the Cr content from 21.1 to 23.5 at.%, plate-like sigma (sigma) and alpha-Cr phases formed during the thermal exposure. These phases were mainly located in the interdendritic areas and grew significantly as the thermal exposure time increased. The coarsening process of the gamma' phase obeyed the Lifshitz, Slyozov, and Wagner (LSW) model, and the gamma' particles maintained a coherent relationship with the gamma matrix during the thermal exposure. Carbides (M23C6) formed and coarsened at the grain boundaries, and their distribution gradually transformed from discontinuous to continuous during the thermal exposure. The evolutions of the gamma' phase and M23C6 carbides were not significantly affected by the Cr-content variation. As the thermal exposure time increased, the room-temperature impact toughness degraded significantly, and a ductile (intragranular)/brittle (mixed intergranular and intragranular) transition occurred. The degradation of impact toughness mainly occurred due to coarsening of the M23C6 carbides along the grain boundaries and the growth of plate-like phases (sigma, alpha-Cr) in the interdendritic areas. (C) 2018 Elsevier B.V. All rights reserved.
资助项目	National High Technology Research and Development Program[2012AA03A501]
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:000432666200053
资助机构	National High Technology Research and Development Program
内容类型	期刊论文
源URL	[http://ir.imr.ac.cn/handle/321006/128110]
专题	金属研究所_中国科学院金属研究所
通讯作者	Lu, Shanping
作者单位	1.Chinese Acad Sci, Inst Met Res, CAS Key Lab Nucl Mat & Safety Assessment, Shenyang, Liaoning, Peoples R China 2.Univ Chinese Acad Sci, Beijing 100049, Peoples R China 3.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	Wu, Dong,Li, Dianzhong,Lu, Shanping. Effect of Cr content on the microstructural stability and impact-toughness evolution of a Ni-Fe-based weld metal[J]. JOURNAL OF ALLOYS AND COMPOUNDS,2018,749:465-472.
APA	Wu, Dong,Li, Dianzhong,&Lu, Shanping.(2018).Effect of Cr content on the microstructural stability and impact-toughness evolution of a Ni-Fe-based weld metal.JOURNAL OF ALLOYS AND COMPOUNDS,749,465-472.
MLA	Wu, Dong,et al."Effect of Cr content on the microstructural stability and impact-toughness evolution of a Ni-Fe-based weld metal".JOURNAL OF ALLOYS AND COMPOUNDS 749(2018):465-472.