Scope and Objectives

The primary objective of MultiHy is to develop an advanced multiscale modelling framework to assist in the evaluation of the hydrogen embrittlement susceptibility of materials and components in realistic service conditions based on microstructural information. This is expected to have a particularly high impact on the development and application of advanced, high-strength alloys with complex microstructures. Such materials can be highly susceptible to hydrogen embrittlement; however, existing numerical models are unable to relate the influences of microstructural features in such materials to measureable macroscopic hydrogen embrittlement susceptibility indicators.

The modelling will focus on determining the rate and mode of hydrogen transport in the material with the aid of experimental measurements. Hydrogen transport will be related to the degradation and reliability of materials and components by developing a robust and transferrable methodology for determining the critical local conditions causing hydrogen embrittlement initiation and the key microstructural features affecting hydrogen transport to the fracture site. This will be achieved by combining our understanding of hydrogen transport on different length scales, from atomistic calculations through to component-level hydrogen diffusion models.