Simulation of separation of hydrogen desorption peak for grain boundary

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

The kind and the amount of defects in steel, that trap hydrogen, can be estimated from peaks in the hydrogen desorption profile obtained from thermal desorption analysis. We developed a numerical model which can simulate the desorption profiles for pure iron and eutectoid steel. Studying the mechanism of intergranular cracking by hydrogen embrittlement, in this presentation, we talk of the simulation of separating the peak for grain boundary from that for dislocation using the numerical model incorporating the binding energy of grain boundary which is obtained from the first-principles calculation.