The interaction of hydrogen with microstructural defects studied by internal friction

In order to evaluate the hydrogen-defect interactions, an internal friction study is performed on hydrogen-charged cold rolled ultra-low carbon steel. For this purpose, the steel is subjected to various thermo-mechanical treatments and information on the hydrogen-dislocation interactions are obtained via thorough analysis of the so-called hydrogen cold work peak obtained by internal friction. Using existing theoretical models, the peak could be decomposed into two contributions from hydrogen segregation at screw and non-screw dislocations.