Corrosion Science and Technology

The Corrosion Science Society of Korea (한국부식방식학회)
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Effects of Annealing and Post-weld Heat Treatments on Corrosion Behaviors of Super Austenitic Stainless Steel

소둔 및 용접후열처리가 슈퍼 오스테나이트계 스테인리스강의 부식거동에 미치는 영향

  • Yun, Duck Bin (Department of Advanced Materials Engineering, Sunchon National University) ;
  • Park, Jin Sung (Department of Advanced Materials Engineering, Sunchon National University) ;
  • Cho, Dong Min (Department of Advanced Materials Engineering, Sunchon National University) ;
  • Hong, Seung Gab (POSCO Technical Research Laboratories) ;
  • Kim, Sung Jin (Department of Advanced Materials Engineering, Sunchon National University)
  • 윤덕빈 (순천대학교 신소재공학과) ;
  • 박진성 (순천대학교 신소재공학과) ;
  • 조동민 (순천대학교 신소재공학과) ;
  • 홍승갑 (포스코 기술연구원) ;
  • 김성진 (순천대학교 신소재공학과)
  • Received : 2021.11.26
  • Accepted : 2021.12.10
  • Published : 2021.12.31
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Abstract

The effect of two different annealing temperatures on the level of the second phase precipitated in the microstructure and the corrosion behaviors of super austenitic stainless steel were examined. The sample annealed at 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 the interface 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 the unmixed zone (UMZ) during the welding process, leading to the local depletion of Mo concentrations around the sigma phase. On the other hand, the fraction of the newly precipitated fine sigma phase in the UMZ was greatly 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 conditions should be further optimized to ensure the superior corrosion resistance of welded super austenitic stainless steel.

Keywords

References

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