Effect of inhomogeneity on the microstructural evolution and mechanical behaviour of a vanadium-containing Fe-Cr-Ni-Mo weld metal

doi:10.1016/j.msea.2021.140758

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	Effect of inhomogeneity on the microstructural evolution and mechanical behaviour of a vanadium-containing Fe-Cr-Ni-Mo weld metal
	Sun, Jian 1,2; Lu, Shanping 1,2
刊名	MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
	2021-03-04
卷号	806 页码:15
关键词	Welding Carbides Transmission electron microscopy Atom probe tomography Inter-dendritic segregation
ISSN号	0921-5093
DOI	10.1016/j.msea.2021.140758
通讯作者	Lu, Shanping(shplu@imr.ac.cn)
英文摘要	Precipitation and mechanical behavior of a novel Fe-Cr-Ni-Mo weld metal containing different V contents in as-welded (AW) and post-weld heat treatment (PWHT) conditions were investigated using X-ray diffraction (XRD), transmission electron microscopy (TEM), and atom probe tomography (APT). The results showed that the dislocation density increased significantly with an increase in the V content for PWHT weld metal owing to a higher volume fraction of the discrete nano-scale MC carbides pinning the dislocations. Therefore, strengthening contributions were mainly attributed to the precipitation strengthening and dislocation strengthening for PWHT weld metals containing V. The segregation of strong carbide forming elements (V and Mo) at inter-dendritic (ID) region, which was produced by solute redistribution during solidification, exhibited a major contributor to the continuous diffusion of C element from dendrite core (DC) to ID region during PWHT, so-called uphill diffusion. Also, TEM and APT showed that an inhomogeneous distribution of carbides owing to the V and Mo elemental segregation as well as the higher density dislocation at ID segregation, exhibiting that nano-scale M2C or MC carbides were mainly precipitated in ID region whilst large M3C carbides were mainly developed in DC region for PWHT weld metal.
资助项目	Major R&D Project of Liaoning Province[2020JH1/10100001] ; National Key R&D Program of China[2016YFB0300601] ; Natural Science Foundation of Liaoning Province[2019JH3/30100039]
WOS研究方向	Science & Technology - Other Topics ; Materials Science ; Metallurgy & Metallurgical Engineering
语种	英语
出版者	ELSEVIER SCIENCE SA
WOS记录号	WOS:000620945600002
资助机构	Major R&D Project of Liaoning Province ; National Key R&D Program of China ; Natural Science Foundation of Liaoning Province
内容类型	期刊论文
源URL	[http://ir.imr.ac.cn/handle/321006/160897]
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, Shenyang Natl Lab Mat Sci, 72 Wenhua Rd, Shenyang 110016, Peoples R China 2.Univ Sci & Technol China, Sch Mat Sci & Engn, 72 Wenhua Rd, Shenyang 110016, Peoples R China
推荐引用方式 GB/T 7714	Sun, Jian,Lu, Shanping. Effect of inhomogeneity on the microstructural evolution and mechanical behaviour of a vanadium-containing Fe-Cr-Ni-Mo weld metal[J]. MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING,2021,806:15.
APA	Sun, Jian,&Lu, Shanping.(2021).Effect of inhomogeneity on the microstructural evolution and mechanical behaviour of a vanadium-containing Fe-Cr-Ni-Mo weld metal.MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING,806,15.
MLA	Sun, Jian,et al."Effect of inhomogeneity on the microstructural evolution and mechanical behaviour of a vanadium-containing Fe-Cr-Ni-Mo weld metal".MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING 806(2021):15.