Evaluation of Fundamental Process of Hydrogen Embrittlement near a Crack based on Dislocation Dynamics Method

Abstract

Hydrogen embrittlement (HE) occurring for metal under hydrogen environment is one of the hindrance to realize hydrogen society. The whole picture of the HE mechanism, however, caused by a combination of a wide range of metal, environment, mechanical conditions has not been clarified yet. In this study, the hydrogen effects on various properties (i.e. surface energy, dislocation mobility, elastic constant, stress intensity factor for dislocation emission etc.) have been calculated based on atomic simulations at first. Based on those results, dislocation dynamics analyses near a crack have been performed to evaluate the ductile-brittle transition in the presence of hydrogen as a primal fundamental process of HE.