SUS 316ステンレス鋼の高温切欠クリープ破壊に及ぼす真空度の影響

抄録

This paper studies the effect of vacuum on the creep rupture time of SUS 316 unnotched and notched round bar specimens. Creep and creep rupture tests were carried out using three types of notched specimens in air and vacuum at 873 K. Creep rupture times of the unnotched and notched specimens in vacuum were shorter than those in air. The reduction of rupture time due to the vacuum was smaller In notched specimens compared with unnotched specimens. The rupture time ratio, tr (notched)/tr (unnotched), in vacuum was larger than that in air. The environmental rupture time ratio, tr (air)/tr (vacuum), decreased with increasing the elastic stress concentration factor. The effect of vacuum was attributed to the crack initiation and propagation periods.