Microstructure and Mechanical Properties of a Novel Designed 9Cr-ODS Steel Synergically Strengthened by Nano Precipitates
文献类型：期刊论文
| 作者 | Rui Xiang1,2; Li Yanfen1,2,3; Zhang Jiarong2,3; Wang Qitao1,2; Yan Wei1,2,3; Shan Yiyin1,2,3 |
| 刊名 | ACTA METALLURGICA SINICA
 |
| 出版日期 | 2023-12-11 |
| 卷号 | 59期号:12页码:1590-1602 |
| 关键词 | ODS steel MX precipitates nano-oxide microstructure mechanical property |
| ISSN号 | 0412-1961 |
| DOI | 10.11900/0412.1961.2021.00534 |
| 通讯作者 | Li Yanfen(yfli@imr.ac.cn) |
| 英文摘要 | Oxide dispersion-strengthened (ODS) steels with nano-scale Y2O3 or Y-Ti-O oxides have been considered as potential structural materials used in advanced nuclear systems. In this work, a novel 9Cr-ODS steel, namely, MX-ODS steel, was designed by decreasing carbon content to eliminate conventional M23C6-type carbides and by increasing the content of nitrogen and vanadium to form MX-type precipitates. In addition, the MX-ODS steel was synergistically strengthened by nano-scale MX precipitates and oxides. After fabrication by powder metallurgy, microstructural observation, and mechanical property tests were conducted after different heat treatments. The density of the prepared materials using hot forging instead of hot isostatic pressing was about 98%. Results of the microstructure observation of the MX-ODS steel indicated that after normalizing and tempering, the tempered martensitic structure dominated, and the mean effective grain size was approximately 1 mu m. Moreover, the preferential orientation of coarse-grained and fine-grained mixed grains was not detected. By diminishing carbon content, M C-23(6)-type carbides precipitated at the grain and sub-grain boundaries were eliminated. By contrast, MX-type precipitates with a diameter of approximately 30-200 nm were formed in the matrix. Furthermore, nanoscale Y-rich oxides with an average size of approximately 3.0 nm were dispersed in the matrix, and a number density can reach to approximately 1.9 x 10(23) m(-3). Furthermore,"core-shell"structure precipitates were found, which were spherical in shape with a diameter ranging from 10 to 20 nm. Such precipitates also contained Y, Ta, and O as the core and V as the shell. The mechanical properties indicate that microhardness decreased from 372 to 320 HV with the increase of normalizing temperature from 980 degrees C to 1200 degrees C. In addition, microhardness decreased significantly after tempering but initially increased and then decreased with the increase of tempering temperature from 700 degrees C to 800 degrees C, with a peak microhardness at approximately 750 degrees C. Excellent strength and ductility were obtained after normalizing at 1100 degrees C for 1 h and then tempering at 750 degrees C for 1 h. Yield strength, ultimate tensile strength, and total elongation were 1039 MPa, 1103 MPa, and 20.5% when tested at room temperature and 291 MPa, 333 MPa, and 16% at 700 degrees C, respectively. |
| 资助项目 | National Natural Science Foundation of China[51971217] ; Excellent Scholar Funding of Institute of Metal Research, Chinese Academy of Sciences |
| WOS研究方向 | Metallurgy & Metallurgical Engineering |
| 语种 | 英语 |
| WOS记录号 | WOS:001153597600005 |
| 出版者 | SCIENCE PRESS |
| 资助机构 | National Natural Science Foundation of China ; Excellent Scholar Funding of Institute of Metal Research, Chinese Academy of Sciences |
| 源URL |  |
| 专题 | 金属研究所_中国科学院金属研究所 |
| 通讯作者 | Li Yanfen |
| 作者单位 | 1.Univ Sci & Technol China, Sch Mat Sci & Engn, Shenyang 110016, Peoples R China 2.Chinese Acad Sci, Inst Met Res, Shi Changxu Innovat Ctr Adv Mat, Shenyang 110016, Peoples R China 3.Chinese Acad Sci, Inst Met Res, CAS Key Lab Nucl Mat & Safety Assessment, Shenyang 110016, Peoples R China |
| 推荐引用方式 GB/T 7714 | Rui Xiang,Li Yanfen,Zhang Jiarong,et al. Microstructure and Mechanical Properties of a Novel Designed 9Cr-ODS Steel Synergically Strengthened by Nano Precipitates[J]. ACTA METALLURGICA SINICA,2023,59(12):1590-1602. |
| APA | Rui Xiang,Li Yanfen,Zhang Jiarong,Wang Qitao,Yan Wei,&Shan Yiyin.(2023).Microstructure and Mechanical Properties of a Novel Designed 9Cr-ODS Steel Synergically Strengthened by Nano Precipitates.ACTA METALLURGICA SINICA,59(12),1590-1602. |
| MLA | Rui Xiang,et al."Microstructure and Mechanical Properties of a Novel Designed 9Cr-ODS Steel Synergically Strengthened by Nano Precipitates".ACTA METALLURGICA SINICA 59.12(2023):1590-1602. |
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。