Effect of Si on Microstructure and Mechanical Properties of a 9Cr Ferritic/Martensitic Steel
文献类型：期刊论文
| 作者 | Zhang, Qiankun1,2; Hu, Xiaofeng1; Jiang, Haichang1; Rong, Lijian1 |
| 刊名 | ACTA METALLURGICA SINICA
 |
| 出版日期 | 2024-09-11 |
| 卷号 | 60期号:9页码:1200-1212 |
| 关键词 | Si M 23 C 6 Laves phase 8 ferrite mechanical property |
| ISSN号 | 0412-1961 |
| DOI | 10.11900/0412.1961.2022.00398 |
| 通讯作者 | Hu, Xiaofeng(xfhu@imr.ac.cn) |
| 英文摘要 | Due to the worsening of environmental pollution and energy shortage, nuclear energy has become an increasingly important energy source, offering clean, high-energy, safe, and stable power to meet the needs of modern life and production. P91 steel is an excellent heat-resistant steel, widely used in nuclear power plants for its good mechanical properties, high thermal conductivity, and low irradiation swelling rate. However, with the emergence of lead and lead- bismuth eutectic (LBE) cooled fast reactors (LFRs), P91 steel s inferior compatibility with LBE has limited its use in LFR construction. To address this issue, 9Cr ferritic/martensitic steel with high Si content (H-Si steel) was designed in this study to develop a compatible structural material for LFR heat exchange tubes. In addition, the effects of Si on the microstructure and mechanical properties of as-cast, homogenized, tempered, and aged H- Si steel were investigated using various techniques, including OM, FESEM, TEM, EBSD, tensile, and impact tests. The results show that the increase in Si content leads to 3.9% 8 ferrite (volume fraction) in as-cast H-Si steel, which can be eliminated completely by homogenization heat treatment. Tempering produces a Si-enriched layer around M 23 C 6 due to the high Si content in the H-Si steel, which can suppress the rapid growth of M 23 C 6 and maintain a smaller size of M 23 C 6 than that of M 23 C 6 in P91 steel. Meanwhile, the Si- enriched layer can slow down the growth of M 23 C 6 and promote the nucleation and growth of the Laves phase during aging at 550 degrees C, which induces smaller M 23 C 6 and larger Laves phase in aged H-Si steel than that in aged P91. Due to the higher Si content and smaller M 23 C 6 , the tempered H-Si steel exhibits significantly higher strength than P91. After aging, the strength of H-Si steel further increases because of the precipitation of the Laves phase. Both tempered alloy steels have similar impact energy (about 210 J) and the fracture mode is ductile fracture. However, the precipitation of the Laves phase after aging decreases the impact energy of both alloy steels. The aged H-Si steel had a larger and more Laves phase, resulting in a partial cleavage area in the impact fracture surface and inducing a lower impact energy compared to H-Si steel. |
| WOS研究方向 | Metallurgy & Metallurgical Engineering |
| 语种 | 英语 |
| WOS记录号 | WOS:001320333900005 |
| 出版者 | SCIENCE PRESS |
| 源URL |  |
| 专题 | 金属研究所_中国科学院金属研究所 |
| 通讯作者 | Hu, Xiaofeng |
| 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 |
| 推荐引用方式 GB/T 7714 | Zhang, Qiankun,Hu, Xiaofeng,Jiang, Haichang,et al. Effect of Si on Microstructure and Mechanical Properties of a 9Cr Ferritic/Martensitic Steel[J]. ACTA METALLURGICA SINICA,2024,60(9):1200-1212. |
| APA | Zhang, Qiankun,Hu, Xiaofeng,Jiang, Haichang,&Rong, Lijian.(2024).Effect of Si on Microstructure and Mechanical Properties of a 9Cr Ferritic/Martensitic Steel.ACTA METALLURGICA SINICA,60(9),1200-1212. |
| MLA | Zhang, Qiankun,et al."Effect of Si on Microstructure and Mechanical Properties of a 9Cr Ferritic/Martensitic Steel".ACTA METALLURGICA SINICA 60.9(2024):1200-1212. |
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。