Knowledge Management System Of Institute of metal research，CAS
| Effects of nitrogen on precipitation and tensile behaviors of 25Cr-20Ni austenitic stainless steels at elevated temperatures | |
| Hu, Guodong; Wang, Pei; Li, Dianzhong; Li, Yiyi | |
| 2019-04-03 | |
| Source Publication | MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
 |
| ISSN | 0921-5093 |
| Volume | 752Pages:93-100 |
| Abstract | To understand the effects of nitrogen on precipitation and tensile behaviors at elevated temperatures, 25Cr-20Ni austenitic stainless steels with different nitrogen contents (0.065 wt %, 0.13 wt % and 0.17 wt %) were tensioned from room temperature to 1000 degrees C. Results show that the elongation and area reduction change differently with temperature increasing from 800 degrees C to 1000 degrees C, which are caused by different fracture modes. The necking concentrates in a small zone in the tensile samples of 0.17 wt % N steel, while the necking deformation occurs in all gauge length in specimens of other two steels. The local necking in 0.17 wt % N steel is induced by the enhanced recrystallization softening effect during tensile deformation. As the dislocation recovery are retarded by more solute nitrogen atoms and nitrides in 0.17 wt % N steel, the dislocation density difference between deformed grains and recrystallized grains turns larger, which results in a higher recrystallization rate and enhanced softening effect in further deformation. Additionally, the content of M23C6 precipitates unexpectedly increases with the increasing nitrogen after tensile test at 800 degrees C. This is because the increasing nitrogen promotes the formation of NbCrN in higher nitrogen steels during solution heat treatment, instead of Nb(C, N) in lower nitrogen steels. The precipitation of NbCrN releases carbon into austenitic matrix, leading to the acceleration of M23C6 precipitation during tensile test at 800 degrees C. |
| Keyword | Austenitic stainless steel Nitrogen High-temperature tensile property Precipitate Fracture mode |
| Indexed By | SCI |
| Language | 英语 |
| WOS ID | WOS:000464088200011 |
| Publisher | ELSEVIER SCIENCE SA |
| Citation statistics | |
| Document Type | 期刊论文 |
| Identifier | http://ir.imr.ac.cn/handle/321006/81198 |
| Collection | 中国科学院金属研究所 |
| Recommended Citation GB/T 7714 | Hu, Guodong,Wang, Pei,Li, Dianzhong,et al. Effects of nitrogen on precipitation and tensile behaviors of 25Cr-20Ni austenitic stainless steels at elevated temperatures[J]. MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING,2019,752:93-100. |
| APA | Hu, Guodong,Wang, Pei,Li, Dianzhong,&Li, Yiyi.(2019).Effects of nitrogen on precipitation and tensile behaviors of 25Cr-20Ni austenitic stainless steels at elevated temperatures.MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING,752,93-100. |
| MLA | Hu, Guodong,et al."Effects of nitrogen on precipitation and tensile behaviors of 25Cr-20Ni austenitic stainless steels at elevated temperatures".MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING 752(2019):93-100. |
| Files in This Item: | There are no files associated with this item. | |||||
Items in the repository are protected by copyright, with all rights reserved, unless otherwise indicated.
Edit Comment