Journal of the Korean Institute of Gas (한국가스학회지)

The Korean Institute of GAS (한국가스학회)
권호 표지

The Hydrogen Behavior of Surface Layers of High Strength DP Thin Sheet Steels for Automobile

자동차 박강판용 고강도 DP강 표면층의 수소거동

  • 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)
  • 박재우 (서울과학기술대학교 신소재공학과) ;
  • 강계명 (서울과학기술대학교 신소재공학과)
  • Received : 2010.11.01
  • Accepted : 2010.12.27
  • Published : 2010.12.31
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Abstract

According to the lack of resources and the stringency of environmental regulations, a study of the high strength thin plate sheet steels for automobile have been become an important issue for automobile industry. However, the problem of hydrogen embrittlement of high strength sheet steels was concerned with the degradation of mechanical properties. Therefore, we studied the hydrogen behavior of surface layers of 590MPa DP sheet steels on development using by relationship the microstructure of subsurface and the distribution of micro hardnesses. Hydrogen was charged into the specimens using by the cathodic electrolytic method. The behavors of under surface layers were investigated by the observation of microstructures and the micro vickers hardness test with the amount of hydrogen charging with hydrogen charging conditions.

자원 부족과 환경규제의 강화에 따라 자동차 강판재의 고강도화와 박강판화가 주요 이슈로 대두되고 있다. 그러나 고강도 강판재 사용에 있어 수소취성은 기계적 성질 저하의 문제가 되고 있다. 본 연구에서는 개발중인 590MPa급 DP강을 대상으로 조성 및 조직특성에 따른 표면층에서의 수소의 거동에 대해 연구하였다. 수소주입은 음극전기분해법을 이용하여 강제 주입시켰고, 수소주입조건에 따른 수소주입량과 표면층 조직관찰 및 미소경도시험 결과의 관계로 부터 표면층의 수소거동을 평가하였다.

Keywords

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