Environmental strength evaluation of welded steel joint in sea water |
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| Authors: | Se-Hi Chung Eui-Gyun Na |
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| Affiliation: | 1. Department of Precision Mechanical Engineering, Chonbuk National University, 560-765, Chonju, Korea
2. Department of Marine Mechanical Engineering, Kun San National Fisheries Junior Colleage, 573-400, Kun San, Korea
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| Abstract: | Corrosion fatigue crack growth behaviours were experimentally evaluated for the parent metal, as-welded and PWHT specimens
of SM53B steel. Multi-pass welding was done by a submerged arc welder. Metallographic observations along the weld fusion boundary
were made to investigate the variation of microstructures through the thickness direction. PWHT was carried out at 650°C with
holding time of 1/4hr and 40hr. The corrosion fatigue test was conducted in 3.5% NaCl solution with the frequency of 3Hz.
In all cases, crack growth in corrosive environment was faster than that of in air. Besides, at the low †K region, crack growth was greatly influenced by corrosive environment and the heat treatment condition. |
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| Keywords: | Post Weld Heat Treatment(PWHT) Heat Affected Zone(HAZ) Residual Stress Microstructures Stress Intensity Factor Range Corrosion Fatigue Corrosive Environment Electrochemical Reaction |
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