| Summary: | 碩士 === 國立臺灣科技大學 === 機械工程系 === 104 === In this study, dry sliding wear behavior of Ti-6Al-4V and Ti-10V-2Fe-3Al titanium alloys against HSS using pin-on-disk test was investigated. The wear tests at different sliding velocities (0.2, 0.3, 0.4 and 0.5 m/s) and applied loads (20, 60 and 100 N) have been conducted, and the results are presented in this thesis. Three wear mechanisms were identified, Oxidative wear and Abrasive wear occurs at low sliding velocities, and Delamination wear occurs at high sliding velocities. With increasing the sliding velocity, titanium alloys underwent a transition from oxidative wear to delamination wear. A corresponding minimum loss of material was found at the transition velocity. Moreover, the transition velocity of Ti-10V-2Fe-3Al is lower than that of Ti-6Al-4V. Experimental results reveal that the wear resistance of Ti-6Al-4V performed better than Ti-10V-2Fe-3Al. Ti-10V-2Fe-3Al shows lower coefficient of friction than that of than Ti-6Al-4V. However, the wear rate of Ti-10V-2Fe-3Al is higher than Ti-6Al-4V. The observation of the wear debris using XRD and the worn specimens using SEM and EPMA illustrates the transition of wear mechanisms because of the increase of the sliding velocity.
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