Corrosion Science and Technology

The Corrosion Science Society of Korea (한국부식방식학회)
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Effects of Heat Inputs on Phase Transformation and Resistance to Intergranular Corrosion of F316 Austenitic Stainless Steel

F316 오스테나이트 스테인리스강의 상변태 및 입계부식저항성에 미치는 입열의 영향

  • Jeong, Gyue-Seog (Mechanical & Plant Design Engineering Department, KEPCO Engineering & Construction Company) ;
  • Lee, In-Sung (Research Institute of Iron and Steel, Engineering Research Park, Yonsei University) ;
  • Kim, Soon-Tae (Research Institute of Iron and Steel, Engineering Research Park, Yonsei University)
  • 정규석 (KEPCO E&C, 기계배관) ;
  • 이인성 (연세대학교 공학연구원, 철강연구소) ;
  • 김순태 (연세대학교 공학연구원, 철강연구소)
  • Received : 2020.05.19
  • Accepted : 2020.06.10
  • Published : 2020.06.30
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Abstract

To elucidate the effect of heat inputs on phase transformation and resistance to intergranular corrosion of F316 austenitic stainless steel (ASS), thermodynamic calculations of each phase and time-temperature-transformation diagram were conducted using JMaPro simulation software, oxalic acid etch test, double-loop electrochemical potentiokinetic reactivation test (DL-EPR), field emission scanning electron microscopy with energy dispersive spectroscopy, and transmission electron microscopy analyses of Cr carbide (Cr23C6), austenite phase and ferrite phase. F316 ASS containing a relatively low C content of 0.043 wt% showed a slightly sensitized microstructure (acceptably dual structure) due to a small amount of Cr carbide precipitated at heat affected zone irrespective of heat inputs. Based on results of DL-EPR test, although heat input was increased, the ratio of Ir to Ia was only increased very slightly due to a slight sensitization. Therefore, heat inputs have little influences on resistance to intergranular corrosion of F316 austenitic stainless steel containing 0.043 wt% C.

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References

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