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Microstructural characterization of low alloy steel A508-309/308L stainless steel dissimilar weld metals
Okonkwo, Bright O.1,2; Ming, Hongliang1; Wang, Jianqiu1; Meng, Fanjiang3; Xu, Xuelian3; Han, En-Hou1
Corresponding AuthorMing, Hongliang(hlming12s@imr.ac.cn) ; Wang, Jianqiu(wangjianqiu@imr.ac.cn)
2021-04-01
Source PublicationINTERNATIONAL JOURNAL OF PRESSURE VESSELS AND PIPING
ISSN0308-0161
Volume190Pages:11
AbstractIn 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.
KeywordLow alloy steel Stainless steel SEM EBSD Interface Dissimilar metal weld
Funding OrganizationNational 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
DOI10.1016/j.ijpvp.2020.104297
Indexed BySCI
Language英语
Funding ProjectNational 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 Research AreaEngineering
WOS SubjectEngineering, Multidisciplinary ; Engineering, Mechanical
WOS IDWOS:000637337400010
PublisherELSEVIER SCI LTD
Citation statistics
Cited Times:3[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.imr.ac.cn/handle/321006/162329
Collection中国科学院金属研究所
Corresponding AuthorMing, Hongliang; Wang, Jianqiu
Affiliation1.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
Recommended Citation
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.
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