Journal of the Korean Society for Heat Treatment (열처리공학회지)

The Korean Society for Heat Treatment (한국열처리공학회)
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Ductile-to-Brittle Transition Behavior of Two Austenitic Fe-18Cr-10Mn Alloys with the Combined Addition of Nitrogen and Carbon

질소와 탄소가 복합 첨가된 두 오스테나이트계 Fe-18Cr-10Mn 합금의 연성-취성 천이 거동

  • Lee, S.Y. (Department of Materials Science and Engineering, Seoul National University of Science and Technology) ;
  • Kim, B.Y. (Department of Materials Science and Engineering, Seoul National University of Science and Technology) ;
  • Hwang, B. (Department of Materials Science and Engineering, Seoul National University of Science and Technology)
  • 이승용 (서울과학기술대학교 신소재공학과) ;
  • 김보영 (서울과학기술대학교 신소재공학과) ;
  • 황병철 (서울과학기술대학교 신소재공학과)
  • Received : 2014.12.11
  • Accepted : 2014.12.24
  • Published : 2015.01.30
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Abstract

The ductile-to-brittle transition behavior of two austenitic Fe-18Cr-10Mn alloys with the combined addition of nitrogen and carbon was investigated in this study. The alloys exhibited a ductile-to-brittle transition behavior because of unusual brittle fracture at low temperatures unlike conventional austenitic alloys. The alloy with higher carbon content had higher yield and tensile strengths than that with lower carbon content due to the solid solution strengthening effect resulting from carbon addition. However, the increase in carbon content promoted the occurrence of intergranular fracture, and thus deteriorated the impact toughness. In order to develop successfully the austenitic Fe-18Cr-10Mn alloys with the excellent combination of strength and toughness in the future, therefore, more systematic studies are required to find the appropriate amount and ratio of nitrogen and carbon.

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References

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