Evolution of Intragranular Strain and Mosaicity in Undeformed and Deformed α- and γ-Grains of Duplex Steel during Electrolytic Hydrogenation

Hydrogen embrittlement threatens the mechanical integrity of steel in industries like infrastructure and aerospace. This experiment investigates duplex steel with coarse grains in two conditions: (i) solution-annealed (defect-free) and (ii) plastically deformed (~5% strain) with cracks, slip bands, and delaminated grain boundaries. Lab EBSD pre-characterization will identify specific grains for further DFXM monitoring during hydrogen uptake. Intragranular strain and mosaicity evolution will be mapped using ω–η and θ/2θ scans at different electrochemical charging stages. The results will provide a first-ever quantitative correlation between grain characteristics (slip bands, cracks, twins, residual strain) and hydrogen-induced intragranular changes. This study will enhance understanding of hydrogen damage mechanisms and support the development of steels with improved resistance to embrittlement.