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Environmental strength evaluation of welded steel joint in seawater |
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| Authors: | Se-Hi Chung Jae-Kyoo Lim Eui-Gyun Na |
| Affiliation: | 1. Department of Precision Mechanical Engineering, Chonbuk National University, 560-756, Chonju, Korea 2. Department of Mechanical Design, Chonbuk National University, 560-756, Chonju, Korea 3. Chonbuk National University, 560-756, Chonju, Korea |
| Abstract: | A study on corrosion fatigue was experimentally conducted for the as-welded and PWHT specimens of the steels, HT80 and SM53B in 3.5% NaCl solution. Submerged arc welding was done. PWHT was carried out at comparatively high temperature of 650° C. Besides, in order to simulate the residual stress in weld HAZ, the stress of 98MPa was applied during PWHT. Corrosion fatigue crack growth was dependent upon the materials and PWHT conditions. In the case of HT80, crack growth in corrosion environment was faster than that in air. However, the crack growth of the main crack for SM53B in 3.5% NaCl solution was decreased in comparison with that in air, unlike HT80. The sensitivity to corrosion environment was reduced due to PWHT. The applied stress in HAZ during PWHT acted to enhance the crack growth compared with that of the PWHT specimen without stress. |
| Keywords: | Post Weld Heat Treatment (PWHT) Heat Affected Zone (HAZ) Corrosion Fatigue Stress Intensity Factor Range Crack Growth Rate Secondary Crack |
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