Korean Journal of Materials Research (한국재료학회지)

Materials Research Society of Korea (한국재료학회)
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Evaluation of Hydrogen Embrittlement of High Strength Steel for Automobiles by Small Punch Test

소형펀치시험을 이용한 자동차용 고강도강 수소취성 평가

  • 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 : 2011.10.18
  • Accepted : 2011.11.30
  • Published : 2012.01.27
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Abstract

The hydrogen embrittlement of high strength steel for automobiles was evaluated by small punch (SP) test. The test specimens were fabricated to be 5 series, having various chemical compositions according to the processes of heat treatment and working. Hydrogen charging was electrochemically conducted for each specimen with varying of current density and charging time. It was shown that the SP energy and the maximum load decreased with increasing hydrogen charging time in every specimen. SEM investigation results for the hydrogen containing samples showed that the fracture behavior was a mixed fracture mode having 50% dimples and 50% cleavages. However, the fracture mode of specimens with charging hydrogen changed gradually to the brittle fracture mode, compared to the mode of other materials. All sizes and numbers of dimples decreased with increasing hydrogen charging time. These results indicate that hydrogen embrittlement is the major cause of fracture for high strength steels for automobiles; also, it is shown that the small punch test is a valuable test method for hydrogen embrittlement of high strength sheet steels for automobiles.

Keywords

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