Effects of Aging at 550 °C on <i>α</i>′-Martensitic Transformation of High Si-Bearing Metastable Austenitic Stainless Steel Weld Metal

doi:10.1007/s40195-024-01697-x

IMR OpenIR

	Effects of Aging at 550 °C on α′-Martensitic Transformation of High Si-Bearing Metastable Austenitic Stainless Steel Weld Metal
	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)
	2024-04-22
发表期刊	ACTA METALLURGICA SINICA-ENGLISH LETTERS
ISSN	1006-7191
页码	13
摘要	The high Si-bearing 15Cr-9Ni-Nb metastable austenitic stainless steel weld metal was prepared via gas tungsten arc welding and then processed by stabilized heat treatment (SHT) at 850 degrees C for 3 h. The effects of 550 degrees C aging on the alpha '-martensitic transformation of the as-welded and the SHT weld metals were investigated. The results showed that the weld metal had poor thermal stability of austenite. The precipitation of NbC during the 850 degrees C SHT made the thermal stability of the local matrix decrease and led to the formation of a large amount of C-depleted alpha '-martensite. The precipitation of coarse sigma-phase at the delta-ferrite led to the Cr-depleted zone and the formation of Cr-depleted alpha '-martensite at the early stage of 550 degrees C aging. The homogenized diffusion of C and Cr in the matrix during 550 degrees C aging led to the restoration of austenitic thermal stability and the decrease of alpha '-martensite content. The C-depleted alpha '-martensite content in the SHT weld metal decreased rapidly at the early stage of aging due to the fast diffusion rate of the C atom in the matrix, while the Cr-depleted alpha '-martensite decreased at the later stage of aging due to the decreased diffusion rate of the Cr.
关键词	Metastable austenitic stainless steel weld metal alpha '-martensitic transformation delta-ferrite sigma-phase
资助者	National Key Research and Development Program of China ; Innovation Project of Shenyang National Laboratory for Materials Science ; China Institute of Atomic Energy
DOI	10.1007/s40195-024-01697-x
收录类别	SCI
语种	英语
资助项目	National Key Research and Development Program of China[2018YFA0702902] ; Innovation Project of Shenyang National Laboratory for Materials Science[SYNL-2022] ; China Institute of Atomic Energy[E141L803J1]
WOS研究方向	Metallurgy & Metallurgical Engineering
WOS类目	Metallurgy & Metallurgical Engineering
WOS记录号	WOS:001206458600003
出版者	CHINESE ACAD SCIENCES, INST METAL RESEARCH
引用统计
文献类型	期刊论文
条目标识符	http://ir.imr.ac.cn/handle/321006/186109
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, CAS Key Lab Nucl Mat & Safety Assessment, Inst Met Res, Shenyang 110016, Peoples R China
推荐引用方式 GB/T 7714	Chen, Yakui,Wei, Shitong,Wu, Dong,等. Effects of Aging at 550 °C on α′-Martensitic Transformation of High Si-Bearing Metastable Austenitic Stainless Steel Weld Metal[J]. ACTA METALLURGICA SINICA-ENGLISH LETTERS,2024:13.
APA	Chen, Yakui,Wei, Shitong,Wu, Dong,&Lu, Shanping.(2024).Effects of Aging at 550 °C on α′-Martensitic Transformation of High Si-Bearing Metastable Austenitic Stainless Steel Weld Metal.ACTA METALLURGICA SINICA-ENGLISH LETTERS,13.
MLA	Chen, Yakui,et al."Effects of Aging at 550 °C on α′-Martensitic Transformation of High Si-Bearing Metastable Austenitic Stainless Steel Weld Metal".ACTA METALLURGICA SINICA-ENGLISH LETTERS (2024):13.