Effects of Stabilization Heat Treatment on Microstructure and Mechanical Properties of Si-Bearing 15Cr-9Ni-Nb Austenitic Stainless Steel Weld Metal

doi:10.1007/s40195-022-01497-1

IMR OpenIR

	Effects of Stabilization Heat Treatment on Microstructure and Mechanical Properties of Si-Bearing 15Cr-9Ni-Nb Austenitic Stainless Steel Weld Metal
	Chen, Yakui 1,2; Wu, Dong 1; Li, Dianzhong 1; Li, Yiyi 1,3; Lu, Shanping 1,3
通讯作者	Lu, Shanping(shplu@imr.ac.cn)
	2022-12-08
发表期刊	ACTA METALLURGICA SINICA-ENGLISH LETTERS
ISSN	1006-7191
页码	13
摘要	Two 15Cr-9Ni-Nb austenitic stainless steel weld metals with 2.5% Si and 3.5% Si (namely 2.5Si and 3.5Si samples, respectively) were designed and prepared through tungsten inert gas (TIG) welding and then hold at 800 degrees C or 900 degrees C for 3 h for stabilization. The microstructure and mechanical properties were investigated both for the as-welded and after-stabilization heat treatment (SHT) weld metals. There are 3.0-4.0% martensite and 2.5-3.5% delta ferrite in the 2.5Si as-welded weld metal and 6.0-7.0% delta ferrite in the 3.5Si as-welded weld metal. After SHT, a large amount of martensite formed in the 2.5Si weld metal, and delta -> gamma transition occurred during the SHT process both for the 2.5Si and 3.5Si weld metals. There were a large amount of coarse NbC and few nanoscale NbC in the as-welded weld metal. During the SHT, a large amount of nanoscale NbC formed in the matrix, while a large number of G phases formed at the austenite grain boundaries and the delta/gamma interfaces. The decrease in solid solution C and delta ferrite content led to the decline of the yield strength of the weld metal after SHT. The martensite formed in 2.5Si weld metal after SHT had less effect on strength because of its low carbon content. The G phases formed during the SHT reduced the impact energy of the weld metal because it promoted the intergranular fracture, while the delta -> gamma transition reduced the amount of the delta/gamma interfaces and avoided the intergranular fracture, which was beneficial for the impact toughness of the weld metals.
关键词	Austenitic stainless steel Weld metal Stabilization heat treatment Martensite NbC delta -> gamma transition
资助者	China Institute of Atomic Energy ; innovation project of Shenyang National Laboratory for Materials Science
DOI	10.1007/s40195-022-01497-1
收录类别	SCI
语种	英语
资助项目	China Institute of Atomic Energy[E141L803J1] ; innovation project of Shenyang National Laboratory for Materials Science[SYNL-2022]
WOS研究方向	Metallurgy & Metallurgical Engineering
WOS类目	Metallurgy & Metallurgical Engineering
WOS记录号	WOS:000895640400001
出版者	CHINESE ACAD SCIENCES, INST METAL RESEARCH
引用统计	被引频次：4[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/321006/175641
专题	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, 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,Wu, Dong,Li, Dianzhong,et al. Effects of Stabilization Heat Treatment on Microstructure and Mechanical Properties of Si-Bearing 15Cr-9Ni-Nb Austenitic Stainless Steel Weld Metal[J]. ACTA METALLURGICA SINICA-ENGLISH LETTERS,2022:13.
APA	Chen, Yakui,Wu, Dong,Li, Dianzhong,Li, Yiyi,&Lu, Shanping.(2022).Effects of Stabilization Heat Treatment on Microstructure and Mechanical Properties of Si-Bearing 15Cr-9Ni-Nb Austenitic Stainless Steel Weld Metal.ACTA METALLURGICA SINICA-ENGLISH LETTERS,13.
MLA	Chen, Yakui,et al."Effects of Stabilization Heat Treatment on Microstructure and Mechanical Properties of Si-Bearing 15Cr-9Ni-Nb Austenitic Stainless Steel Weld Metal".ACTA METALLURGICA SINICA-ENGLISH LETTERS (2022):13.