Abstract
Reciprocating sliding wear test of uncoated titanium alloy, Ti-6Al-4V is investigated using pin-on-flat contact arrangement of Ti-6Al-4V/Ti-6Al-4V pair under variable number of cycles at low number of cycles. The worn surfaces of the titanium alloy specimens were analyzed with the use of optical microscope (2D and 3D OM) and Vickers Hardness analysis was carried on. The pattern of the wear scar characteristics determined and the finding at the end of wear track had been focus through the presence at the end of wear track. It is suggesting an evidence of plastic deformation with the increasing in hardness value. The increase in hardness value at the end of wear track indicates increase in the plastic deformation with increasing number of cycles.
Highlights
Titanium alloy exhibit a good properties in industrial applications due to its excellent of corrosion resistance at high temperatures, good fatigue strength, elevated mechanical resistance together with a low density and the application are widely use for aerospace and aeronautical due to their high strength to weight ratio [1,2]
High contact pressure areas traverse the surface causing the material to compress in the depth direction and extrude out from the sides and there is an accumulation of shear strain for reversing plastic strains
It was found that the hardness is higher located at the end of wear track compared to the worn and unworn surfaces and increases according to the increasing number of cycles
Summary
Titanium alloy exhibit a good properties in industrial applications due to its excellent of corrosion resistance at high temperatures, good fatigue strength, elevated mechanical resistance together with a low density and the application are widely use for aerospace and aeronautical due to their high strength to weight ratio [1,2]. The contact pressure applying to the wear test give significant features towards the mechanism involved. The present study is an extension of previous similar studies [8], characterizes the wear under reciprocating sliding wear conditions with variable low number of cycles at initiation period of wear on the flat bar specimen unlike the previous studies where flat bar specimen was applied with variable number of normal load. Specimen and materials Both type of specimen which are contact pressure/pin and flat bar is titanium alloy, Ti-6Al-4V. It has good properties in excellent combination of high specific strength (strength-to-weight ratio) at elevated temperature, fracture resistant characteristics, and their exceptional resistance to corrosion [2]. The hardness of the wear region is determined by Micro Vicker’s hardness-tester, set at load of 980.7 mN (HV0.1) indented to the surface for 5 seconds at three different areas which are original surface, wear track and end of wear track according to ASTM E384 standard
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