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Review of Experimental Methods for Hydrogen Embrittlement Susceptibility Assessment of Press-Hardened Steels

Press-hardened steels (PHSs) are one of the dominant materials of choice for the lightweight construction of structural and safety-related automobile components. However, due to their high strength, exceeding 1500 MPa, PHSs may be susceptible to hydrogen embrittlement (HE) when they are exposed to hydrogen-containing environments, increasing thus the risk of delayed fractures or catastrophic failure in a crash event. Therefore, evaluating the HE susceptibility of PHS is crucial to guarantee the safe application of these steels and predict potential fractures that can compromise structural integrity. The present study compares different state-of-the-art methods to assess the HE susceptibility of a PHS 1500 grade. Four-point bending tests, Slow Strain Rate Tests and Constant Load Tests are performed in hydrogen-charged samples with different H concentrations to evaluate the critical H content that causes a significant loss of mechanical properties. The results of the different experimental procedures are discussed, and the main advantages and drawbacks are reviewed. Additionally, a novel test based on the essential work of fracture methodology is proposed. The method uses sharp-notched specimens prepared by a shear-cutting tool, which are subsequently tested up to fracture in a universal tensile machine. The new test offers a fast and cost-effective solution to estimate the HE susceptibility of PHS and assess the degradation of fracture resistance.

DOI Number: 10.33313/512/B0701
Product:
2024 CHS2 Conference Proceedings
PR-512-B0701
David Frometa, Silvia Molas, Armadeu Concustell, Laura Grife, Daniel Casellas, Melodie Mandy, et al.
May 27, 2024
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