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

Abstract:

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

• Periodical: Key Engineering Materials (Volume 926)
• Pages: 2077-2091
• DOI: https://doi.org/10.4028/p-oeev6l
• Online since: July 2022
• Authors: Andreas Drexler*, Besim Helic, Zahra Silvayeh, Christof Sommitsch, Klemens Mraczek, Josef Domitner
• Keywords: Dual Phase Steel, Hydrogen, Hydrogen Embrittlement, Metal Forming, Plastic Strain

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