Influence of Plastic Deformation on the Hydrogen Embrittlement Susceptibility of Dual Phase Steels

The susceptibility of advanced high-strength steels (AHSS) to hydrogen embrittlement (HE) limits the broad utilization these materials for body-in-white (BIW) components. considerable decrease both ductility and toughness due local accumulation inside formed components may cause unpredictable time-delayed failure. In particular deep-drawn punched AHSS are prone absorption. This work investigates influence plastic deformation on absorption dual phase (DP) steels. For that purpose, tensile samples were machined out three commercial 1.2 mm-thick DP sheets with ultimate strengths 626 MPa, 826 MPa 1096 MPa. Samples uniaxially pre-strained 2 %, 5 10 15 % 20 %. After pre-straining electrochemically charged hydrogen, actual contents determined using a thermal desorption analyser (TDA). Before after charging, hardness was measured uniaxial quasi-static properties determined. order quantify HE, slow strain rate tests (SSRT) performed. results correlated fraction martensite each