Microstructural and mechanical properties evolution for 9Cr-Si heat resistant steel deposited metals under different heat treatment states
文献类型：期刊论文
| 作者 | Yu, Tongtong1,2,3; Wei, Shitong1,3; Lu, Shanping1,3 |
| 刊名 | MATERIALS CHARACTERIZATION
 |
| 出版日期 | 2024-11-01 |
| 卷号 | 217页码:12 |
| 关键词 | 9Cr heat resistant steel Si content Mechanical properties delta ferrite |
| ISSN号 | 1044-5803 |
| DOI | 10.1016/j.matchar.2024.114430 |
| 通讯作者 | Wei, Shitong(stwei@imr.ac.cn) ; Lu, Shanping(shplu@imr.ac.cn) |
| 英文摘要 | To develop the matched filler metal for the structural materials in Generation IV lead-cooled fast reactor (LFR), the microstructural evolution and mechanical property variation of 9Cr-Si heat resistant steels deposited metals were investigated both for the as-welded and as-aged (at 550 degrees C) weld metals. The experimental results indicate two precipitates in the as-welded deposited metals: the bigger M23C6 and the smaller MX. Si facilitates the nucleation of M23C6. The chain-like precipitates (consisting of M23C6) form at the boundaries of prior austenite and martensitic laths in high-Si specimens. They deteriorate not only the strength but also the impact energy. Meanwhile, a few delta ferrites form in high-Si deposited metal deteriorating the impact energy. Precipitates tend to nucleate at the interface between the delta ferrite and the martensite after aging. New types of precipitates (Mo-rich M6X and Laves) with rapid coarsening rate form in as-aged high-Si deposited metals as time increases. Coarse precipitates deteriorate the pinning effect, which causes the recovery of laths and dislocations. Subgrain pinned by M23C6 forms in deposited metals with post-weld heat treatment (PWHT) during aging. The structure hinders the formation of M6X and facilitates the formation of nano-sized MX. Therefore, the mechanical properties of deposited metals with PWHT are stable during long-term (up to 10,000 h) aging treatments. |
| 资助项目 | LingChuang Research Project of China National Nuclear Corporation ; Natural Science Foundation of Liaoning Province of China[2022-MS-006] ; China Institute of Atomic Energy[E141L803J1] ; Natural Science Foundation of Heilongjiang Province[TD2021E006] |
| WOS研究方向 | Materials Science ; Metallurgy & Metallurgical Engineering |
| 语种 | 英语 |
| WOS记录号 | WOS:001333238800001 |
| 出版者 | ELSEVIER SCIENCE INC |
| 资助机构 | LingChuang Research Project of China National Nuclear Corporation ; Natural Science Foundation of Liaoning Province of China ; China Institute of Atomic Energy ; Natural Science Foundation of Heilongjiang Province |
| 源URL |  |
| 专题 | 金属研究所_中国科学院金属研究所 |
| 通讯作者 | Wei, Shitong; Lu, Shanping |
| 作者单位 | 1.Chinese Acad Sci, CAS Key Lab Nucl Mat & Safety Assessment, Inst Met Res, Shenyang, Peoples R China 2.Univ Sci & Technol China, Sch Mat Sci & Engn, Shenyang, Peoples R China 3.Chinese Acad Sci, Inst Met Res, Shenyang Natl Lab Mat Sci, Shenyang, Peoples R China |
| 推荐引用方式 GB/T 7714 | Yu, Tongtong,Wei, Shitong,Lu, Shanping. Microstructural and mechanical properties evolution for 9Cr-Si heat resistant steel deposited metals under different heat treatment states[J]. MATERIALS CHARACTERIZATION,2024,217:12. |
| APA | Yu, Tongtong,Wei, Shitong,&Lu, Shanping.(2024).Microstructural and mechanical properties evolution for 9Cr-Si heat resistant steel deposited metals under different heat treatment states.MATERIALS CHARACTERIZATION,217,12. |
| MLA | Yu, Tongtong,et al."Microstructural and mechanical properties evolution for 9Cr-Si heat resistant steel deposited metals under different heat treatment states".MATERIALS CHARACTERIZATION 217(2024):12. |
入库方式： OAI收割
来源：金属研究所
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