Journal of Materials Research and Technology Journal of Materials Research and Technology
J Mater Res Technol 2017;6:13-32 DOI: 10.1016/j.jmrt.2016.03.007
Original Article
Wear resistance enhancement of titanium alloy (Ti–6Al–4V) by ball burnishing process
Goutam Devaraya Revankara,, , Raviraj Shettyb, Shrikantha Srinivas Raoc, Vinayak Neelakanth Gaitonded
a Department of Mechanical Engineering, Tontadarya College of Engineering, Gadag, India
b Department of Mechanical and Manufacturing Engineering, Manipal Institute of Technology, Manipal, India
c Department of Mechanical Engineering, National Institute of Technology Karnataka, Surathkal, India
d Department of Industrial and Production Engineering, B.V.B. College of Engineering and Technology, Hubli, Karnataka, India
Received 21 July 2015, Accepted 30 March 2016
Abstract

The objective of the research was to improve the wear resistance of titanium alloys by ball burnishing process. Burnishing process parameters such as burnishing speed, burnishing feed, burnishing force and number of pass were considered to minimize the specific wear rate and coefficient of friction. Taguchi optimization results revealed that burnishing force and number of pass were the significant parameters for minimizing the specific wear rate, whereas the burnishing feed and speed play important roles in minimizing the coefficient of friction. After burnishing surface microhardness increased from 340 to 405Hv, surface roughness decreased from 0.45 to 0.12μm and compressive residual stress were generated immediately below the burnished surface. The optimization results showed that specific wear rate decreased by 52%, whereas coefficient of friction was reduced by 64% as compared to the turned surface. The results confirm that, an improvement in the wear resistance of Ti–6Al–4V alloy has been achieved by the process of ball burnishing.

Keywords
Titanium alloy (Ti–6Al–4V), Taguchi technique, Ball burnishing, Wear rate, Coefficient of friction
J Mater Res Technol 2017;6:13-32 DOI: 10.1016/j.jmrt.2016.03.007