GS0215-374 Ti-6AL-4V合金の4点曲曲げ疲労特性に及ぼす低温窒化の影響評価およびその場疲労き裂進展観察
詳細
In this study, the effect of low temperature nitriding on the 4-points bending fatigue properties of Ti-6Al-4V alloy were examined. The fatigue limit of the nitrided specimens tended to increase as the nitriding temperature decreased. Especially, the specimens nitrided at 550 ℃ showed higher fatigue limit than that of the un-nitrided specimen, whereas the conventional nitriding at 850 ℃ reduced the fatigue limit of Ti-6Al-4V alloy. This was because a thick nitrogen compound layer was formed and grain-coarsening occurred. Moreover, the fatigue crack propagation of the nitrided Ti-6Al-4V alloy was observed using the developed system.
