Deformation-induced defects controlling fracture toughness of steel revealed by tritium desorption behaviors |
| |
| Affiliation: | 1. Department of Materials Science and Engineering, Waseda University, Okubo 3-4-1, Shinjuku, Tokyo 169-8555, Japan;2. Institute for Industrial Science, The University of Tokyo, Tokyo, Japan;1. Research Center of Laser Fusion, Chinese Academy of Engineering Physics, Mianyang 621900, China;2. Science and Technology on Plasma Physics Laboratory, Mianyang 621900, China;3. IFSA Collaborative Innovation Center, Shanghai Jiao Tong University, Shanghai 200240, China;1. State Key Laboratory for Mechanical Behavior of Materials, School of Materials Science and Engineering, Xi’an Jiaotong University, Xi’an 710049, China;2. Department of Geosciences, Center for Materials by Design, and Institute for Advanced Computational Science, State University of New York, Stony Brook, NY 11794-2100, USA;3. School of Chemical Engineering & Technology, China University of Mining and Technology, Xuzhou 221116, China;1. Institute of Advanced Materials and Technology, University of Science and Technology Beijing, Beijing, 100083, PR China;2. State Grid Zhejiang Electric Power Research Institute, Hangzhou, 310000, PR China;3. Engineering Technology Institute, CITIC Dicastal Co. Ltd, Hebei, 066000, PR China;4. Safetech Research Institute, Beijing, 100083, PR China |
| |
| Abstract: | Defects induced by plastic deformation have been revealed by means of room temperature desorption and thermal desorption spectroscopy of tritium with regards to the ductile crack growth resistance and brittle fracture initiation in steels in the ductile-to-brittle transition region. Tritium, as a probe for detecting defects, was introduced into non-deformed or deformed samples. Three steels, the microstructures of which are characterized by the constraint factor for slip extension, were employed. The residual tritium in a specimen after three days at room temperature increased to the extent corresponding to the constraint factors when plastic deformation was applied. The thermally desorbed tritium, with a peak desorption rate around 150°C, also increased according to the constraint factors. Referring to the previous analysis of the R-curves, the constraint for the extension of slip across grain boundaries is shown to control both the ductile crack growth resistance and the brittle fracture initiation through the deformation microstructures that evolve vacancy clusters or microvoids. |
| |
| Keywords: | |
| 本文献已被 ScienceDirect 等数据库收录！ |
|
