Transactions of the Korean Society of Mechanical Engineers A (대한기계학회논문집A)

The Korean Society of Mechanical Engineers (대한기계학회)
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Influence of Punch Velocity on Gas Hydrogen Embrittlement Behaviors in SA372 Steel

압력용기용 강의 가스수소 취화 거동에 미치는 펀치속도의 영향

  • Bae, Kyung-Oh (Dept. of Mechanical Design Engineering, Andong Nat'l Univ.) ;
  • Shin, Hyung-Seop (Dept. of Mechanical Design Engineering, Andong Nat'l Univ.) ;
  • Baek, Un-Bong (Center of Energy Materials Metrology, Korea Research Institute of Standards and Science) ;
  • Nahm, Seung-Hoon (Center of Energy Materials Metrology, Korea Research Institute of Standards and Science) ;
  • Park, Jong-Seo (Center of Energy Materials Metrology, Korea Research Institute of Standards and Science) ;
  • Lee, Hae-Moo (Center of Energy Materials Metrology, Korea Research Institute of Standards and Science)
  • 배경오 (안동대학교 기계설계공학과) ;
  • 신형섭 (안동대학교 기계설계공학과) ;
  • 백운봉 (한국표준과학연구원 에너지소재표준센터) ;
  • 남승훈 (한국표준과학연구원 에너지소재표준센터) ;
  • 박종서 (한국표준과학연구원 에너지소재표준센터) ;
  • 이해무 (한국표준과학연구원 에너지소재표준센터)
  • Received : 2013.05.11
  • Accepted : 2013.10.05
  • Published : 2013.12.01
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Abstract

When using hydrogen gas as an ecofriendly energy sources, it is necessary to conduct a safety assessment and ensure thereliability of the hydrogen pressure vessel against hydrogen embrittlement expected in the steel materials. In this study, by applying the in-situ SP test method, the gas hydrogen embrittlement behaviors in SA372 steel, which is commonly used as a pressurized hydrogen gas storage container, were evaluated. To investigate the hydrogen embrittlement behavior, SP tests at different punch velocities were conducted for specimens with differently fabricated surfaces at atmospheric pressure and under high-pressure hydrogen gas conditions. As a result, the SA372 steel showed significant hydrogen embrittlement under pressurized hydrogen gas conditions. The effect of punch velocity on the hydrogen embrittlement appeared clearly; the lower punch velocity case indicated significant hydrogen embrittlement resulting in lower SP energy. The fractographic morphologies observed after SP test also revealed the hydrogen embrittlement behavior corresponding to the punch velocity adopted. Under this pressurized gas hydrogen test condition, the influence of specimen surface condition on the extent of hydrogen embrittlement could not be determined clearly.

수소를 친환경적 에너지원으로 사용하는 경우, 수소 압력용기용 강재의 수소취화 평가 및 안전성에 대한 신뢰성이 확보되어야 한다. 본 연구에서는, in-situ SP 시험법을 적용하여 수소 저장용기로 사용이 검토되고 있는 SA372 강재의 가스 수소취화 거동을 평가하였다. 표면가공 조건을 달리한 시험편을 사용하여 대기압, 고압 수소가스 압력하에서 펀치속도를 달리한 SP 시험을 통해 가스수소 취화 거동을 조사하였다. 그 결과, SA372 강은 가스수소 압력하에서 현저한 수소취화 거동을 나타내었다. 이때 펀치속도에 따른 영향도 명확하게 나타나, 펀치속도가 낮을수록 현저한 수소취화를 나타내 낮은 SP 에너지 값을 나타내었다. 또한 SP 시험 후 파면양상 관찰결과도 펀치속도에 따른 수소취화 거동을 명확하게 나타내었다. 본 가압수소 시험조건에서는 시험편 표면조건의 영향은 명확하게 볼 수 없었다.

Keywords

References

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