State-of-the-art of surface integrity induced by tool wear effects in machining process of titanium and nickel alloys: A review

Abstract

Aerospace and medical manufacturing fields develop rapidly benefiting from excellent mechanical and physical properties of titanium and nickel alloys, including superior strength-to-weight ratio, high mechanical strength, excellent high corrosion resistance, and excellent biocompatibility. Since the components of aerospace and medical fields are manufactured to improve the functional performances as the goal, surface integrity is regarded as key a factor in assessing surface qualities. Titanium and nickel alloys belong to difficult-to-cut materials due to poor machinability. The tool extremely easy wears out and the available tool life diminishes rapidly, which results in surface integrity deteriorated. This article aims to review the effects of tool wear on surface integrity in cutting titanium and nickel alloys. The typical surface integrity characteristics including surface topography (surface defects and surface roughness), microstructural alterations (plastic deformation, grain sizes, and white layer), and mechanical properties (microhardness and residual stress) are reviewed. The possible perspectives of future work for tool wear effects on surface integrity are also put forward.