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JWJ > Volume 31(5); 2013 > Article
Journal of KWJS 2013 October;31(5) :20-25.
Published online November 5, 2013.
doi:https://doi.org/10.5781/KWJS.2013.31.5.20
Heat Treatment Effect on Pitting Corrosion of Super Duplex Stainless Steel UNS S32750 FCA Welds
Bok-Su Jang1,2, In-June Moon2, Se-Cheol Kim2,3, Jin-Hyun Koh2
1,2Jeong-woo Industrial Machine Co., Ltd
2School of Energy․Materials․Chemical, Korea University of Technology and Education
2,3Korea Specialty contractor Financial Cooperative Technology Educational Institute
Correspondence: Jin-Hyun Koh  Email: jhkoh@kut.ac.kr
  Published online November 5, 2013
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 (930℃, 1080℃, 1230℃) and quenched. Based on the microstructural examination, it was found that the σ phase was formed in base metals and welds heat treated at 930℃ while there were little σphases formed in base metals and weld metal experienced the relatively fast cooling from 1080℃ and 1230℃. On the other hand, the most weight loss due to pitting corrosion occurred in base and weld metals heat treated at 930℃. 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 σphase. The hardness was greatly increased due to the precipitation σphase.
Keywords: Pitting corrosion | FCAW | PWHT | Weight loss | Ferrite | Sigma-phase
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