Journal of the Korean Society for Heat Treatment (열처리공학회지)

The Korean Society for Heat Treatment (한국열처리공학회)
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Variation in Microstrutures and Mechanical Properties During Long-term Material Degradation of Austenitic 316L Steel

오스테나이트계 316강의 장시간 재료 열화에 따른 미세조직의 변화와 기계적 특성의 변화

  • Kong, Wonsik (Department of Materials Science and Engineering, Chosun University) ;
  • Kim, Chungseok (Department of Materials Science and Engineering, Chosun University)
  • 공원식 (조선대학교 신소재공학과) ;
  • 김정석 (조선대학교 신소재공학과)
  • Received : 2021.11.05
  • Accepted : 2021.11.22
  • Published : 2021.11.30
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Abstract

In this study, we investigate the variation in microstruture and mechanical property of austenitic 316L stainless steel during long-term material degradation. To simulate the material degradation, the AISI 316 steel was exposed to accelerate under a temperature of 600℃ for up to 10000 hours at each predetermined heat treatment time. As the long-term material degradation time increase, the grain shape was changed from polygonal grains with annealing twins to circular grains. Most twins distributed uniformly interior of grains are recovered and disappered with long-term material degradation. Also, the δ ferrite along grain boundaries decomposed and transformed into the σ phase resulting in decrease of elongation of austenitic 316L stainless steel.

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Acknowledgement

이 논문은 조선대학교 학술연구비의 지원을 받아 연구되었음(2020).

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