|
|||||
|
|
The effects of double notches on the mechanical properties of a high-strength pipeline steel under hydrogen atmosphere |
|
| Affiliation: | 1. State Key Laboratory of Heavy Oil Processing, College of New Energy and Materials, China University of Petroleum, Beijing 102249, People''s Republic of China;2. Beijing Key Laboratory of Advanced High Temperature Materials, Central Iron and Steel Research Institute, Beijing 100081, People''s Republic of China;1. Institute of Advanced Materials and Technology, University of Science and Technology Beijing, Beijing, 100083, PR China;2. Safetech Research Institute, Beijing, 100083, PR China;1. Tianjin Key Laboratory of Advanced Joining Technology, School of Materials Science and Engineering, Tianjin University, Tianjin, 300072, China;2. School of Materials Science and Engineering, China University of Petroleum (East China), Qingdao, 266580, China;3. State Key Laboratory of Metal Material for Marine Equipment and Application, Anshan, 114009, China |
| Abstract: | Tensile tests and fatigue life tests are performed on double-notched specimens in hydrogen and nitrogen atmospheres to investigate the effects of double notches on the mechanical properties of a high strength pipeline steel. The results show that the fracture occurs at the notch with a lower stress concentration factor (Kt), which is governed by the combination of the stress concentration and the strain hardening caused by plastic deformation in the tensile process. Hydrogen gas accelerates the crack initiation and growth, but it doesn't affect the competitive mechanism of stress concentration and strain hardening. |
| Keywords: | X80 double-notched specimens Stress concentration Strain hardening Plastic deformation Hydrogen gas Fatigue life tests |
| 本文献已被 ScienceDirect 等数据库收录！ | |