Mechanism of 6-ferrite decomposition in high Si-bearing austenitic stainless steel weld metal during aging at 550 degrees C

doi:10.1016/j.msea.2023.145163

IMR OpenIR

	Mechanism of 6-ferrite decomposition in high Si-bearing austenitic stainless steel weld metal during aging at 550 degrees C
	Chen, Yakui 1,2; Wei, Shitong 1,3; Wu, Dong 1,3; Lu, Shanping 1
通讯作者	Wu, Dong(wudong@imr.ac.cn) ; Lu, Shanping(shplu@imr.ac.cn)
	2023-06-15
发表期刊	MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
ISSN	0921-5093
卷号	876 页码:11
摘要	The 15Cr-9Ni-Nb austenitic stainless steel weld metal with 3.5 wt% Si content was designed and prepared via tungsten inert-gas arc welding and then stabilized heat treatment (SHT) at 900 degrees C for 3 h. The mechanism of 6-ferrite decomposition during the aging process at 550 degrees C was investigated for both the as-welded (AW) and the SHT weld metals via scanning electron microscopy (SEM), transmission electron microscopy (TEM), scanning transmission electron microscopy (STEM), and high-resolution transmission electron microscopy (HRTEM), and its impact toughness effect was also discussed. The original 6-ferrite for both the AW and SHT weld metals decomposed to the a-phase, A16Mn6Si7-type G-phase, and more stable 6-ferrite during aging. The coarse a-phases were distributed at the 6/y interface and the relatively fine G-phases (A16Mn6Si7) were at the 6/y interface or inside the 6-ferrite. Si promoted the formation of the G-phases and a-phases during aging, consumed a large amount of Cr, Ni, Si, and Mn from the 6-ferrite, and stabilized the remaining 6-ferrite. The impact toughness of the AW weld metal sharply dropped during aging due to the coarse a-phases promoting the formation and propagation of intergranular cracks. The SHT reduced the 6-ferrite in the weld metal, thus avoiding the formation of a large number of a-phases during aging and therefore improving the impact toughness.
关键词	Austenitic stainless steel weld metal 6-ferrite a-phase G-phase Impact toughness
资助者	Shenyang National Laboratory for Materials Science ; National Key Research and Development Program of China ; China Institute of Atomic Energy
DOI	10.1016/j.msea.2023.145163
收录类别	SCI
语种	英语
资助项目	Shenyang National Laboratory for Materials Science ; National Key Research and Development Program of China[2018YFA0702902] ; China Institute of Atomic Energy[E141L803J1]
WOS研究方向	Science & Technology - Other Topics ; Materials Science ; Metallurgy & Metallurgical Engineering
WOS类目	Nanoscience & Nanotechnology ; Materials Science, Multidisciplinary ; Metallurgy & Metallurgical Engineering
WOS记录号	WOS:001002473300001
出版者	ELSEVIER SCIENCE SA
引用统计	被引频次：3[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/321006/178124
专题	中国科学院金属研究所
通讯作者	Wu, Dong; Lu, Shanping
作者单位	1.Chinese Acad Sci, Inst Met Res, Shenyang Natl Lab Mat Sci, 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
推荐引用方式 GB/T 7714	Chen, Yakui,Wei, Shitong,Wu, Dong,et al. Mechanism of 6-ferrite decomposition in high Si-bearing austenitic stainless steel weld metal during aging at 550 degrees C[J]. MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING,2023,876:11.
APA	Chen, Yakui,Wei, Shitong,Wu, Dong,&Lu, Shanping.(2023).Mechanism of 6-ferrite decomposition in high Si-bearing austenitic stainless steel weld metal during aging at 550 degrees C.MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING,876,11.
MLA	Chen, Yakui,et al."Mechanism of 6-ferrite decomposition in high Si-bearing austenitic stainless steel weld metal during aging at 550 degrees C".MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING 876(2023):11.