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(서울과학기술대학교) (서울과학기술대학교) (서울과학기술대학교)
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한국표면공학회 한국표면공학회지 한국표면공학회지 제46권 제3호
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    초록·키워드

    It was investigated that the effects of hydrogen charging on the properties of 590 MPa Dual Phase(DP) steels at the surface layers. The hydrogen-charging time was changed from 5 to 50 hours and current densities from 100, 150, and 200 mA/cm², respectively. It was found that the hydrogen content in the specimen was increased with as the charging time and the current density. The microvickers hardness of the subsurface zone was increased from 215.3 HV to 239.5 HV due to the increase in current density and charging time. The comparison of the absorbed energies tested by a small-punch (SP) test showed that the absorbed energy of the specimen was greatly reduced from 436 to 283 kgf-mm² because of hydrogen embrittlement. It was confirmed that bulb aspects of fracture surface became more brittle with increasing hydrogen content.

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      UCI(KEPA) : I410-ECN-0101-2014-580-003340636