  Twinning induced plasticity (TWIP) steels are high strength metallic
materials with potential for structural components in e.g. automotive
applications. However, they are prone to hydrogen embrittlement (HE) and
galvanic corrosion. We investigated the susceptibility of a model Fe 27Mn 0.3C
(wt%) TWIP steel towards HE and oxidation at the sub-nanometer scale by atom
probe tomography. We measured segregation of hydrogen and oxygen at grain
boundaries, which appears to be associated to a strong manganese depletion. Our
study suggests a correlation between HE and oxidation mechanisms in TWIP
steels, which we argue can combine to favor the previously reported hydrogen
enhanced decohesion (HEDE) of grain boundaries.
