Abstract
This study was carried out to investigate the influence of a sigma phase precipitation on the pitting corrosion resistance and microstructural change of super duplex stainless steels(UNS S32750). The welds made by FCAW (Flux Cored Arc Welding) were heat treated (, , ) and quenched. Based on the microstructural examination, it was found that the phase was formed in base metals and welds heat treated at while there were little phases formed in base metals and weld metal experienced the relatively fast cooling from and . On the other hand, the most weight loss due to pitting corrosion occurred in base and weld metals heat treated at . It was confirmed that the pitting corrosion occurred in the phase boundaries of ferrite/sigma and austenite/sigma. The pitting corrosion resistance decreased owing to an increase in Cr, Mo depleted areas adjacent to the intermetallic phases such as phases. The hardness was greatly increased due to the precipitation phases.
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