Korean Journal of Materials Research (한국재료학회지)

Materials Research Society of Korea (한국재료학회)
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Hydrogen Embrittlement Evaluation of Subsurface Zone in 590DP Steel by Micro-Vickers Hardness Measurement

미소경도 측정에 의한 590DP강 Subsurface Zone 내 수소취성 평가

  • Choi, Jong-Un (Department of Materials Science and Engineering, Seoul National University of Science and Technology) ;
  • Park, Jae-Woo (Department of Materials Science and Engineering, Seoul National University of Science and Technology) ;
  • Kang, Kae-Myung (Department of Materials Science and Engineering, Seoul National University of Science and Technology)
  • 최종운 (서울과학기술대학교 신소재공학과) ;
  • 박재우 (서울과학기술대학교 신소재공학과) ;
  • 강계명 (서울과학기술대학교 신소재공학과)
  • Received : 2011.09.05
  • Accepted : 2011.10.15
  • Published : 2011.11.27
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Abstract

This study describes a hydrogen embrittlement evaluation of the subsurface zone in 590DP steel by micro-Vickers hardness measurement. The 590DP steel was designed to use in high-strength thin steel sheets as automotive materials. The test specimens were fabricated to 5 series varying the chemical composition through the process of casting and rolling. Electrochemical hydrogen charging was conducted on each specimen with varying current densities and charging times. The relationship between the embrittlement and hydrogen charging conditions was established by investigating the metallography. The micro-Vickers hardness was measured to evaluate the hydrogen embrittlement of the subsurface zone in addition to the microscopic investigation. The micro-Vickers hardness increased with the charging time at the surface. However, the changing ratio and maximum variation of hardness with depth were nearly the same value for each test specimen under the current density of 150 mA/$cm^2$ and charging time of 50 hours. Consequently, it appears that hydrogen embrittlement in 590DP steel can be evaluated by micro-Vickers hardness measurement.

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