浸炭焼入れ後の変形に及ぼす変態塑性の影響

抄録

Coupled metallo-thermo-mechanical analysis by use of heat treatment simulation code “HEARTS” is carried out for a ring-shaped model of Cr-Mo steel under carburized quenching: Diffusion of carbon carrier gas is calculated followed by oil-quenching from 850°C to estimate the distortion as well as structure distribution. To compensate the discrepancy between experimental data and calculated distortion, a special attention is paid on the effect of transformation plasticity. Several trials of simulation depending on the intensity of the effect shows that the transformation plastic strain plays an important role on the mode of distortion during carburized quenching process while a little effect is seen for normal quenching.