Hydrogen-induced delayed fracture of a 1180 MPa martensitic advanced high-strength steel under U-bend loading

•MS1180 showed HIDF susceptibility only under conditions of high stress, significant plastic strain and substantial hydrogen.•Bending limit diagrams identified conditions for safe car manufacturing processes.•The hydrogen-induced fractures propagated in two stages.•Hydrogen content increased with increasing (i) plastic strain, and (ii) hydrogen fugacity.