Berlin 2024 – wissenschaftliches Programm
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MM: Fachverband Metall- und Materialphysik
MM 19: Topical Session: Hydrogen in Materials: from Storage to Embrittlement II
MM 19.2: Vortrag
Dienstag, 19. März 2024, 10:45–11:00, C 130
Microstructure-based modeling of fatigue damage of ferritic steel in hydrogen environments using crystal-plasticity-FEM simulation — •Alexandra Stark1, Wolfgang Verestek1, Petra Sonnweber-Ribic1, and Christian Elsässer2 — 1Robert Bosch GmbH, CR, Renningen — 2Fraunhofer IWM, 79108 Freiburg
Hydrogen Embrittlement (HE) of ferritic steels is a long and well-known phenomenon. Depending on its environment the material may be prone to a premature mechanical failure. In real world service, steel components are frequently exposed to cyclic loading. Therefore, with increasing relevance of hydrogen-related technologies, handling the influence of hydrogen on the fatigue behavior of steel is of growing interest.In the complex phenomenon of metal fatigue, one of the main factors that determine the lifetime is attributed to the microstructure of the metal. A well established approach to describe microstructural influences on the mechanical behavior of metals is the crystal plasticity (CP) theory [1]. CP finite element methods (CP-FEM) are useful to investigate fatigue damage in the material by a microstructure-sensitive modeling. In the present work, a diffusion coupled crystal plasticity model is used to investigate the influence of hydrogen on the fatigue behavior of a ferritic steel. Within this model the mechanical properties of the material are characterized by local hydrogen concentrations based on proposed HE-failure mechanisms. The study addresses the impact of environmental conditions and internal hydrogen concentrations on HE and investigates the influence on the prediction of fatigue damage. [1] F. Roters et al. Acta mater 58.4 (2010): 1152-1211
Keywords: Hydrogen Embrittlement; Crystal Plasticity Theory; Metal Fatigue; Materials Modeling