Author(s)

Shin-ichi Nishida & Nobusuke Hattori

Abstract

Though various kinds of surface treatment methods were applied to improve the wear resistant properties of Ti-6Al-4V alloy, it has been reported that the brittle surface layer of this alloy deteriorated their fatigue properties. Furthermore, when this alloy is nitrided by gas and salt bath, the fatigue strength of nitrided one decreases as compared with that of non-nitrided one. On the other hand, as the ion-nitriding method is treated in clean environment, the surface of the material could become free from hydrogen and oxygen. There are few reports about the fatigue strength of ion-nitrided titanium alloys. Fatigue tests have been accomplished by rotating bending fatigue testing machine using a partial shallow notch specimen after different tempera

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