소둔 및 용접후열처리가 슈퍼 오스테나이트계 스테인리스강의 부식거동에 미치는 영향
Effects of Annealing and Post-weld Heat Treatments on Corrosion Behaviors of Super Austenitic Stainless Steel
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The effect of two different annealing temperatures on the level of the second phase precipitated in the microstructureand the corrosion behaviors of super austenitic stainless steel were examined. The sample annealedat a higher temperature had a significantly lower fraction of the sigma phase enriched with Cr and Mo elements,showing more stable passivity behavior during the potentiodynamic polarization measurement. However,after the welding process with Inconel-type welding material, severe corrosion damage along theinterface between the base metal and the weld metal was observed regardless of the annealing temperature. This was closely associated with the precipitation of the fine sigma phase with a high Mo concentration in theunmixed zone (UMZ) during the welding process, leading to the local depletion of Mo concentrations aroundthe sigma phase. On the other hand, the fraction of the newly precipitated fine sigma phase in the UMZ wasgreatly reduced by post-weld heat treatment (PWHT), and the corrosion resistance was greatly improved. Based on the results, it is proposed that the alloy composition of welding materials and PWHT conditionsshould be further optimized to ensure the superior corrosion resistance of welded super austenitic stainlesssteel.
Abstract
The effect of two different annealing temperatures on the level of the second phase precipitated in the microstructureand the corrosion behaviors of super austenitic stainless steel were examined. The sample annealedat a higher temperature had a significantly lower fraction of the sigma phase enriched with Cr and Mo elements,showing more stable passivity behavior during the potentiodynamic polarization measurement. However,after the welding process with Inconel-type welding material, severe corrosion damage along theinterface between the base metal and the weld metal was observed regardless of the annealing temperature. This was closely associated with the precipitation of the fine sigma phase with a high Mo concentration in theunmixed zone (UMZ) during the welding process, leading to the local depletion of Mo concentrations aroundthe sigma phase. On the other hand, the fraction of the newly precipitated fine sigma phase in the UMZ wasgreatly reduced by post-weld heat treatment (PWHT), and the corrosion resistance was greatly improved. Based on the results, it is proposed that the alloy composition of welding materials and PWHT conditionsshould be further optimized to ensure the superior corrosion resistance of welded super austenitic stainlesssteel.
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