Abstract
The hydrogen embrittlement (HE) of some DP steels was investigated, focusing on the influence of the phosphorus (P) content. Hydrogen-induced micro-cracks and brittle fracture occurred at edges follows the HESIV and HEDE mechanisms. The increased number of ferrite related interface micro-cracks was attributed by the enhanced interface weakening effect of excess P content. Hydrogen influenced crack propagation and fracture in the inner ductile part of the specimen followed the HELP mechanism and can be promoted by a higher P content in solution in matrix. An increased P content caused more significant HE susceptibility for DP steel with less and separated martensite and less Cr, Mo microalloying.
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