Impact of hydrogen on the strain localization of hardened alloys under cyclic loading: some consequence on cyclic crack – SLHyCC

This work is a part of a multi-scales process of understanding the mechanisms related to the localization of plasticity, fatigue damage and the impact of the environment, while responding to a constant need to secure industrial facilities including transports and energy management infrastructures. The proposed program will allow us to assess in case of a structural hardening alloy: the impact of the degree of coherence of the precipitates on the hydrogen trapping, the effect of the state of precipitation on the slip localization with and without hydrogen and finally the consequence of the slip localization both on hydrogen trapping and transport. These three points are fundamental to understand the mechanisms of hydrogen embrittlement of structural hardening alloys and to define a new damage model, which takes into account environment effects. Finally, this project is expected to assist the definition of new materials or new hydrogen-embrittlement resistant metallurgical states.