Regensburg 2025 – wissenschaftliches Programm
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MM: Fachverband Metall- und Materialphysik
MM 4: Materials for the Storage and Conversion of Energy
MM 4.11: Vortrag
Montag, 17. März 2025, 12:45–13:00, H22
Hydrogen Embrittlement in fatigue damage of ferritic steel: Theoretical investigation of failure mechanisms in varying hydrogen environments — •Alexandra Stark1,2, Petra Sonnweber-Ribic1, and Christian Elsässer2 — 1Robert Bosch GmbH, CR, 71272 Renningen — 2Fraunhofer IWM, 79108 Freiburg
In this theoretical study, the influence of hydrogen on the fatigue behavior of a ferritic steel is examined by using a coupled hydrogen-diffusion and crystal-plasticity finite-element (CPFE) model. The damaging effect of hydrogen on structural materials, particularly ferritic and martensitic steels, poses a significant challenge for a wide range of technical applications. Despite being known for about 150 years, the underlying mechanisms of hydrogen embrittlement remain the subject of scientific debates. CPFE models are suitable for ensuring a microstructure-sensitive modelling and enabling the description of local plastic deformation, both essential factors in the complex process of metal fatigue. The presented study investigates the individual and combined effects of different damage models based on proposed hydrogen embrittlement failure mechanisms [1]. Furthermore, the work explores the impact of diverse environmental conditions on the cyclic material damage. The effects of varying local hydrogen concentration and distribution on the fatigue damage, as implemented in the CPFE model, are examined and discussed. [1] A. Stark, P. Sonnweber-Ribic, and C. Elsässer, Theoretical study of individual and combined effects of HELP- and HEDE-based damage models on the fatigue behavior of ferritic steel by hydrogen, submitted (2024).
Keywords: Hydrogen Embrittlement; Fatigue of Metals; Crystal-Plasticity Finite-Element (CPFE); Materials Modeling