| 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 Author | Ming, Hongliang(hlming12s@imr.ac.cn) ; Wang, Jianqiu(wangjianqiu@imr.ac.cn) |
| 2021-04-01 | |
| Source Publication | INTERNATIONAL JOURNAL OF PRESSURE VESSELS AND PIPING
 |
| ISSN | 0308-0161 |
| Volume | 190Pages:11 |
| Abstract | 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. |
| Keyword | Low alloy steel Stainless steel SEM EBSD Interface Dissimilar metal weld |
| Funding Organization | 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 |
| DOI | 10.1016/j.ijpvp.2020.104297 |
| Indexed By | SCI |
| Language | 英语 |
| Funding Project | 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 Research Area | Engineering |
| WOS Subject | Engineering, Multidisciplinary ; Engineering, Mechanical |
| WOS ID | WOS:000637337400010 |
| Publisher | ELSEVIER SCI LTD |
| Citation statistics | |
| Document Type | 期刊论文 |
| Identifier | http://ir.imr.ac.cn/handle/321006/162329 |
| Collection | 中国科学院金属研究所 |
| Corresponding Author | Ming, Hongliang; Wang, Jianqiu |
| Affiliation | 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 |
| 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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