Korean Journal of Materials Research (한국재료학회지)

Materials Research Society of Korea (한국재료학회)
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Effect of Al Addition on the Cryogenic-Temperature Impact Properties of Austenitic Fe-23Mn-0.4C Steels

알루미늄 첨가에 따른 오스테나이트계 Fe-23Mn-0.4C 고망간강의 극저온 충격 특성

  • Kim, Sang-Gyu (Department of Materials Science and Engineering, Seoul National University of Science and Technology) ;
  • Kim, Jae-Yoon (Department of Materials Science and Engineering, Seoul National University of Science and Technology) ;
  • Yun, Tae-Hee (Department of Materials Science and Engineering, Seoul National University of Science and Technology) ;
  • Hwang, Byoungchul (Department of Materials Science and Engineering, Seoul National University of Science and Technology)
  • 김상규 (서울과학기술대학교 신소재공학과) ;
  • 김재윤 (서울과학기술대학교 신소재공학과) ;
  • 윤태희 (서울과학기술대학교 신소재공학과) ;
  • 황병철 (서울과학기술대학교 신소재공학과)
  • Received : 2021.08.14
  • Accepted : 2021.09.05
  • Published : 2021.09.27
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Abstract

The impact properties of two austenitic Fe-23Mn-0.4C steels with different Al contents for cryogenic applications are investigated in this study. The 4Al steel consists mostly of austenite single-phase microstructure, while the 5Al steel exhibits a two-phase microstructure of austenite and delta-ferrite with coarse and elongated grains. Charpy impact test results reveal that the 5Al steel with duplex phases of austenite and delta-ferrite exhibits a ductile-to-brittle transition behavior, while the 4Al steel with only single-phase austenite has higher absorbed energy over 100 J at -196 ℃. The SEM fractographs of Charpy impact specimens show that the 4Al steel has a ductile dimple fracture regardless of test temperature, whereas the 5Al steel fractured at -100 ℃ and -196 ℃ exhibits a mixed fracture mode of both ductile and brittle fractures. Additionally, quasi-cleavage fracture caused by crack propagation of delta-ferrite phase is found in some regions of the brittle fracture surface of the 5Al steel. Based on these results, the delta-ferrite phase hardly has a significant effect on absorbed energy at room-temperature, but it significantly deteriorates low-temperature toughness by acting as the main site of the propagation of brittle cracks at cryogenic-temperatures.

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References

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