Study on effect of heat-assisted rolling on surface morphology and mechanical properties of titanium alloy

Abstract

Abstract This paper mainly investigated the heating influence on surface rolling strengthening of titanium alloy based on the metal thermal softening effect. Surface morphology and mechanical properties of the samples before and after heat-assisted rolling were measured and analyzed. It was found that the surface smoothness and microhardness of the samples rolled at 80°C, 120°C, and 160°C gradually increased as the heating temperature increased. However, the sample rolled at 25°C still had the optimal surface morphology (Ra0.255), the highest surface microhardness (425 HV) and surface residual stress (-497 MPa) because of the characteristics of metal cold work hardening. But the thickness of the hardened layer is much smaller than that of the one rolled at 160°C. In addition, the finite element simulation of the rolling process was carried out, and the dynamic simulation results verified the experimental conclusions. The highest total energy on the surface of the sample rolled at room temperature also indicated its better surface properties.