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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

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.

Keywords

in-situ SP test;Hydrogen embrittlement;SA372 steel;Punch velocity;Fractography;SP energy

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