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| Research on Stress Corrosion Cracking Initiation Behavior of Cold Worked 316L and 308L Stainless Steel |
| Received:May 24, 2021 Revised:June 18, 2021 |
| View Full Text View/Add Comment Download reader |
| DOI：10.7643/issn.1672-9242.2022.01.011 |
| KeyWord:crack initiation cold worked stainless steel constant load high-temperature high-pressure water |
| Author | Institution |
| WANG Jia-mei |
School of Mechanical Engineering, Shanghai Jiao Tong University, Shanghai , China |
| ZHU Tian-yu |
School of Mechanical Engineering, Shanghai Jiao Tong University, Shanghai , China |
| CHEN Kai |
School of Mechanical Engineering, Shanghai Jiao Tong University, Shanghai , China |
| ZHANG Le-fu |
School of Mechanical Engineering, Shanghai Jiao Tong University, Shanghai , China |
| HAN Yao-lei |
Suzhou Nuclear Power Research Institute, Suzhou , China |
| BAO Yi-chen |
Shanghai Nuclear Engineering Research & Design Institute Co., Ltd., Shanghai , China |
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| Abstract: |
| This paper aims to study the effects of load, loading mode and cold deformation on crack initiation behavior. Stress corrosion cracking initiation behavior of cold worked 316 L and 308 L stainless steel under constant load and slow strain rate test in simulated reactor high temperature and high pressure water environment was measured on-line by using a multi axial and multi sample loading device. When the loading load is lower than the yield strength, the two kinds of stainless steels are not easy to crack because of their strong resistance to pitting corrosion and grain boundary oxidation. When the loading load is above the yield stress, the crack initiation and fracture time decrease dramatically with the increment of applied load and the fracture includes two typical stress corrosion cracking morphologies:intergranular cracking and transgranular cracking. The susceptibility of 308 L stainless steel to intergranular or brittle fracture at high strain rate is lower compared with the same level cold worked 316L. The susceptibility to intergranular cracking significantly increased by decreasing the strain rate. Cold work increased the residual strain at both grain and phase boundaries, and thus increased the tendency of crack initiation along those boundaries. |
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