Analysis Of Strain Hardening And Surface Quality In Machining Of Titanium Alloys, Experimental And Simulation-Based Approach

Abstract

In this experiment, strain hardening and surface integrity during the dry turning of the Ti-6Al-4V alloy are investigated by the effect of tool flank wear and cutting parameters. The study examined carbide inserts with three degrees of flank wear carried out in machining trials (1 mm, 1.5 mm and 2 mm). All the machining trials were arranged based on an L27 Taguchi orthogonal array which considers different cutting speeds, feed rates and depths of cut. Effects of surface flank wear and cutting parameters on work-hardening and surface integrity (measured by surface roughness, micro-hardness and microstructure) of titanium alloys were examined. According to the results, supporting surfaces that had been worked more on the sides were clearly harder. Because of stronger plastic deformation on the tool–work piece boundary, more strain hardening took place in the top layer. Research confirmed that tool wear, in particular wear in the critical region, is important in changing surface features.