Publisher : The Korean Institute of Surface Engineering
DOI : 10.5695/JKISE.2013.46.3.126
Title & Authors
The Effect of Hydrogen on the Variation of Properties at the Surface Layers of 590 MPa DP Steels Charged with Hydrogen Choi, Jong-Un; Park, Jae-Woo; Kang, Kae-Myung;
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 , 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 because of hydrogen embrittlement. It was confirmed that bulb aspects of fracture surface became more brittle with increasing hydrogen content.
Hydrogen content;Charging time and current density;Microvickers hardness;Subsurface zone;Small punch test;Bulb aspects of fracture surface;