Abstract
The effects of frictional wear characteristics and microstructural factors such as volume fraction and diameter of primary α phase on fretting fatigue strength of Ti-4.5Al-3V-2Mo-2Fe conducted with various annealing treatments were investigated in this study. Fretting fatigue life of Ti-4.5Al-3V-2Mo-2Fe is hardly affected by the volume fraction and diameter of primary α phase in the low cycle fretting fatigue region. The fretting fatigue limit of Ti-4.5Al-3V-2Mo-2Fe tends to increase with decreasing the volume fraction and average diameter of primary α phase. However, when volume fraction and average diameter of primary α phase are below certain values, the fretting fatigue limit is lowered by coarsening of acicular α phase, which precipitates in β phase region. The weight loss of Ti-4.5Al-3V-2Mo -2Fe tends to increase with decreasing the hardness. The fretting fatigue life of Ti-4.5Al-3V-2Mo-2Fe tends to decrease with increasing the estimated weight loss of the slip region and increasing the depth of the crack growth zone caused by the contact pressure.
