α鉄およびそのMo合金の高温クリープ変形時における動的回復と加工硬化

抄録

The behaviours of dynamic recovery and work-hardening of alpha iron and its molybdenum alloys were investigated by stress relaxation and tensile tests during high temperature creep. It has been found that dynamic recovery rates in the steady-state creep depend strongly on temperature, creep stress, and molybdenum content. On the other hand, the work-hardening rates hardly vary with creep stress and molybdenum content, depending but slightly on temperature through the temperature variation of the elastic modulus. The creep rates which were calculated from the observed dynamic recovery and the work-hardening rates in terms of the idea of recovery creep are in good agreement with the observation. From the results as mentioned above it is concluded that the creep behaviours of alpha iron and its molybdenum alloys are controlled mainly by the dynamic recovery process in which the diffusion of atoms plays an important role.