Korean Journal of Materials Research (한국재료학회지)

Materials Research Society of Korea (한국재료학회)
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Hydrogen Embrittlement of Two Austenitic High-Manganese Steels Using Tensile Testing under High-Pressure Gaseous Hydrogen

고압 수소 가스 하 인장 시험을 이용한 두 오스테나이트계 고망간강의 수소취화 특성 평가

  • Lee, Seung-Yong (Department of Materials Science and Engineering Seoul National University of Science and Technology) ;
  • Baek, Un-Bong (Division of Industrial Metrology Korea Research Institute of Standards and Science) ;
  • Nam, Seung Hoon (Division of Industrial Metrology Korea Research Institute of Standards and Science) ;
  • Hwang, Byoungchul (Department of Materials Science and Engineering Seoul National University of Science and Technology)
  • 이승용 (서울과학기술대학교 신소재공학과) ;
  • 백운봉 (한국표준과학연구원 산업측정표준본부) ;
  • 남승훈 (한국표준과학연구원 산업측정표준본부) ;
  • 황병철 (서울과학기술대학교 신소재공학과)
  • Received : 2016.04.25
  • Accepted : 2016.05.16
  • Published : 2016.07.27
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Abstract

The hydrogen embrittlement of two austenitic high-manganese steels was investigated using tensile testing under high-pressure gaseous hydrogen. The test results were compared with those of different kinds of austenitic alloys containing Ni, Mn, and N in terms of stress and ductility. It was found that the ultimate tensile stress and ductility were more remarkably decreased under high-pressure gaseous hydrogen than under high-pressure gaseous argon, unlike the yield stress. In the specimens tested under high-pressure gaseous hydrogen, transgranular fractures were usually observed together with intergranular cracking near the fracture surface, whereas in those samples tested under high-pressure gaseous argon, ductile fractures mostly occurred. The austenitic high-manganese steels showed a relatively lower resistance to hydrogen embrittlement than did those with larger amounts of Ni because the formation of deformation twins or microbands in austenitic high-manganese steels probably promoted planar slip, which is associated with localized deformation due to gaseous hydrogen.

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References

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