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Interaction of aluminium with hydrogen in twinning-induced plasticity steel

2014; Elsevier BV; Volume: 87; Linguagem: Inglês

10.1016/j.scriptamat.2014.06.007

1872-8456

Eun Ju Song, H. K. D. H. Bhadeshia, Dong-Woo Suh,

Corrosion Behavior and Inhibition

Alloying with aluminium can mitigate the hydrogen embrittlement of twinning-induced plasticity (TWIP) steels. First-principles calculations indicate a new mechanism for this observation, namely that Al atoms are weak traps for hydrogen, because of local dilation around them. This in turn allows the Al-containing steel to absorb more hydrogen, as confirmed by previously unexplained observations in the literature. Calculations using the Oriani theory show that Al can retard the diffusion of hydrogen in TWIP steel via the atomic trapping mechanism.