Local microstructure evolution of a V-containing Fe-Cr-Ni-Mo weld metal subjected to post-weld heat treatment
文献类型：期刊论文
| 作者 | Sun, Jian2; Liu, Jingwu1,2; Wei, Shitong2; Lu, Shanping2 |
| 刊名 | MATERIALS CHARACTERIZATION
 |
| 出版日期 | 2023-09-01 |
| 卷号 | 203页码:20 |
| 关键词 | Weld metal Post-weld heat treatment Inter-dendritic segregation Retained austenite |
| ISSN号 | 1044-5803 |
| DOI | 10.1016/j.matchar.2023.113096 |
| 通讯作者 | Lu, Shanping(shplu@imr.ac.cn) |
| 英文摘要 | The high-strength steels are widely used in modern shipbuilding and marine facilities. However, welding of >900 MPa grade steels is particularly challenging owing to the lack of understanding of fine microstructure for the weld metal (WM). The present investigation is mainly focused on a V-containing Fe-Cr-Ni-Mo WM fabricated by gas metal arc welding (GMAW) in aspects of localized microstructure evolution during post-weld heat treatment (PWHT). Microanalysis of the localized microstructure of inter-dendritic regions (IDRs) and dendrite core region (DCRs) for WMs was conducted by transmission electron microscopy (TEM), transmission kikuchi diffraction (TKD) and atom probe tomography (APT), complimented by nanoindentation hardness testing. It is found that the microstructure of WM in as-welded (AW) and PWHT condition was characterized by elongated martensitic laths with high-density dislocations in IDRs, while that in DCRs was coarse bainitic microstructure with relatively fewer dislocations. Most of retained austenite (RA) formed during cooling after welding was decorated martensite lath boundaries within IDRs owing to the segregation of austenite stabilizing elements after solidification. For PWHT condition, more numerous and smaller nano-scale MC carbides were observed in IDRs compared to DCRs. Furthermore, V atoms were mainly responsible for the nucleation of nano-scale MC carbides, and the growth and coarsening process of them were mainly controlled by diffusion of Mo atoms. Besides, the RA could also decompose into nano-scale MC carbides during PWHT. The IDRs of the PWHT specimens showed the average nanohardness value of 7.4 & PLUSMN; 2.3 GPa, which was higher than that of the DCRs (4.0 & PLUSMN; 0.2 GPa). |
| 资助项目 | National Natural Science Foundation of China[52101060] ; China Postdoctoral Science Foundation[2022M713213] ; Major R amp; D Project of Liaoning Province[2020JH1/10100001] ; Liaoning Provincial Doctoral Initiation Fund Project[2022-BS-008] ; Young Talent Project of Shenyang National Research Center for Materials Science[2022-SYNL] |
| WOS研究方向 | Materials Science ; Metallurgy & Metallurgical Engineering |
| 语种 | 英语 |
| WOS记录号 | WOS:001032093900001 |
| 出版者 | ELSEVIER SCIENCE INC |
| 资助机构 | National Natural Science Foundation of China ; China Postdoctoral Science Foundation ; Major R amp; D Project of Liaoning Province ; Liaoning Provincial Doctoral Initiation Fund Project ; Young Talent Project of Shenyang National Research Center for Materials Science |
| 源URL | [http://ir.imr.ac.cn/handle/321006/178678]  |
| 专题 | 金属研究所_中国科学院金属研究所 |
| 通讯作者 | Lu, Shanping |
| 作者单位 | 1.Univ Sci & Technol China, Sch Mat Sci & Engn, 72 Wenhua Rd, Shenyang 110016, Peoples R China 2.Chinese Acad Sci, Inst Met Res, Shenyang Natl Lab Mat Sci, 72 Wenhua Rd, Shenyang 110016, Peoples R China |
| 推荐引用方式 GB/T 7714 | Sun, Jian,Liu, Jingwu,Wei, Shitong,et al. Local microstructure evolution of a V-containing Fe-Cr-Ni-Mo weld metal subjected to post-weld heat treatment[J]. MATERIALS CHARACTERIZATION,2023,203:20. |
| APA | Sun, Jian,Liu, Jingwu,Wei, Shitong,&Lu, Shanping.(2023).Local microstructure evolution of a V-containing Fe-Cr-Ni-Mo weld metal subjected to post-weld heat treatment.MATERIALS CHARACTERIZATION,203,20. |
| MLA | Sun, Jian,et al."Local microstructure evolution of a V-containing Fe-Cr-Ni-Mo weld metal subjected to post-weld heat treatment".MATERIALS CHARACTERIZATION 203(2023):20. |
入库方式： OAI收割
来源：金属研究所
浏览0
下载0
收藏0
其他版本
除非特别说明，本系统中所有内容都受版权保护，并保留所有权利。