Influence of built up edge on the surface topography of Ti-15Mo

Abstract

Abstract Titanium alloys have been increasingly used in biomedical applications due to their mechanical and corrosion resistance, non-toxicity, and low modulus of elasticity. This latter property leads to intense material deformation during cutting and contributes to the formation of built up edge, which changes tool geometry and chip formation, altering workpiece surface quality. Its instability should also be taken into account, as it contributes to a high dispersion of roughness results. Considering the relevance of such effects in machining of a beta titanium alloy, this paper proposes a characterization of the built up edge formed during turning of Ti-15Mo and the correlation of its geometry with different surface roughness parameters. Obtained results show that the effective rake angle generated by the built up edge changes within a narrow range but its increase contributes to lower reduced peak height values obtained from the Abbott-Firestone curve.