水素昇温脱離特性に及ぼすクリープボイドの影響

抄録

For the clarification of the creep damage detection mechanism by hydrogen, the simulation technique for investigating the effect of creep void on hydrogen thermal desorption characteristics of pure iron has been developed. The dissolved hydrogen was calculated by a kinetics calculation in consideration of trapping and dissociation of hydrogen in voids. In the interaction between hydrogen atoms and voids, the effect of dissociation and adsorption, recombination of hydrogen at the void surface was also taken into account. In addition, hydrogen diffusion inside of samples was calculated according to the diffusion equation. The void number density was used as an input parameter of the simulation. The hydrogen evolution curve obtained from the simulation did not accord with the experimental one. The latter might include the hydrogen desorption from the damages which were too small to be observed by a scanning electron microscope.