Microstructural characterization of low alloy steel A508-309/308L stainless steel dissimilar weld metals

doi:10.1016/j.ijpvp.2020.104297

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	Microstructural characterization of low alloy steel A508-309/308L stainless steel dissimilar weld metals
	Okonkwo, Bright O.1,2; Ming, Hongliang 1; Wang, Jianqiu 1; Meng, Fanjiang 3; Xu, Xuelian 3; Han, En-Hou 1
刊名	INTERNATIONAL JOURNAL OF PRESSURE VESSELS AND PIPING
	2021-04-01
卷号	190 页码:11
关键词	Low alloy steel Stainless steel SEM EBSD Interface Dissimilar metal weld
ISSN号	0308-0161
DOI	10.1016/j.ijpvp.2020.104297
通讯作者	Ming, Hongliang(hlming12s@imr.ac.cn) ; Wang, Jianqiu(wangjianqiu@imr.ac.cn)
英文摘要	In this study, the microstructure and microhardness of low alloy steel A508 welded with 309/308L stainless steel are investigated. The microstructure evaluations show that the heat affected zone of the A508 base metal changes, from tempered bainite to an uneven mixture of bainite and martensite, depending on the intensity of the heat flow from the welding process. Different recrystallization processes at the heat affected zone of the base metal are responsible for the changes of the microstructure, which lead to differences in the grain sizes, strain level, and yield strength in this region. The greatest deformation level is observed in the grain refined region with the highest heat influx, which leads to a high level of grain refinement and stress in this region, followed by the partial grain refined region and base metal matrix region, respectively. The interface region between the base metal and weld metal is observed to be very complex. At some regions of the 309/308L, adjacent to the fusion boundary type II boundaries, resulting from the allotropic delta - gamma transformation and migration of steel phases/boundary at high temperature of welding were observed, alongside the type I boundaries. The 309/308L stainless steel consists of vermicular ferrite distributed along the austenite matrix, while ternary sigma secondary phase was observed to precipitate at the interface of the ferrite/austenite boundary. The yield strength of the grain refined region, partial grain refined region, and base metal matrix in A508 were estimated to be 598 MPa, 600 MPa, and 595 MPa, respectively. Finally, the heat affected zone of the base metal showed the highest hardness followed by the base metal matrix and weld metal, respectively.
资助项目	National Natural Science Foundation of China[51771211] ; Large Advanced PWR major projects[2018ZX06001001] ; Key Research Program of Frontier Sciences, CAS[QYZDY-SSW-JSC012] ; Key Program of the Chinese Academy of Sciences[ZDRW-CN-2017-1]
WOS研究方向	Engineering
语种	英语
出版者	ELSEVIER SCI LTD
WOS记录号	WOS:000637337400010
资助机构	National Natural Science Foundation of China ; Large Advanced PWR major projects ; Key Research Program of Frontier Sciences, CAS ; Key Program of the Chinese Academy of Sciences
内容类型	期刊论文
源URL	[http://ir.imr.ac.cn/handle/321006/162327]
专题	金属研究所_中国科学院金属研究所
通讯作者	Ming, Hongliang; Wang, Jianqiu
作者单位	1.Chinese Acad Sci, CAS Key Lab Nucl Mat & Safety Assessment, Inst Met Res, Shenyang 110016, Peoples R China 2.Univ Sci & Technol China, Sch Mat Sci & Engn, Shenyang 110016, Peoples R China 3.Shanghai Nucl Engn Res & Design Inst Ltd Co, 29 Hongcao Rd, Shanghai 200233, Peoples R China
推荐引用方式 GB/T 7714	Okonkwo, Bright O.,Ming, Hongliang,Wang, Jianqiu,et al. Microstructural characterization of low alloy steel A508-309/308L stainless steel dissimilar weld metals[J]. INTERNATIONAL JOURNAL OF PRESSURE VESSELS AND PIPING,2021,190:11.
APA	Okonkwo, Bright O.,Ming, Hongliang,Wang, Jianqiu,Meng, Fanjiang,Xu, Xuelian,&Han, En-Hou.(2021).Microstructural characterization of low alloy steel A508-309/308L stainless steel dissimilar weld metals.INTERNATIONAL JOURNAL OF PRESSURE VESSELS AND PIPING,190,11.
MLA	Okonkwo, Bright O.,et al."Microstructural characterization of low alloy steel A508-309/308L stainless steel dissimilar weld metals".INTERNATIONAL JOURNAL OF PRESSURE VESSELS AND PIPING 190(2021):11.