Effect of hydrogen diffusion on thermal desorption profile; A Numerical study

Ebihara, Kenichi   ; Suzudo, Tomoaki   ; Kaburaki, Hideo; Takai, Kenichi*

Hydrogen embrittlement of the grain boundary is one of factors causing the delayed fracture of high strength steel. In order to understand the phenomenon, it is important to estimate the amount of hydrogen segregating to grain boundaries. Hydrogen desorption profile obtained by the thermal desorption analysis is mainly used for the estimation of segregated hydrogen. We have already simulated the hydrogen desorption profile using the numerical model into which is incorporated the Oriani's local equilibrium hypothesis and the trap-detrap process. We consider the effect of hydrogen diffusion on the profile using our model and other models reported previously.