Investigation of Surface Integrity and Fatigue Performance of TC4 Titanium Alloy in Centrifugal Barrel Finishing
This paper aims to improve the surface integrity and fatigue performance TC4 titanium alloy. Centrifugal barrel finishing was taken to enhance surface performance of TC4 titanium alloy. Centrifugal barrel finishing experiments and tensile fatigue test were conducted for investigating the surface integrity and fatigue performance of TC4 titanium alloy. The surface integrity including surface roughness, residual stress, micro-hardness, and microstructure were investigated under different conditions by different methods. The tensile fatigue performance were tested and the fatigue fracture were analysed by SEM. The results show that the centrifugal barrel finishing can make surface roughness value decrease 0.623 μm, and the surface hardness reaches to 420 HV from initial 338 HV, increasing by 24.3%, and the maximum residual compressive stress reaches to -462MPa. The fatigue limit reaches to 445 MPa from initial 374 MPa, increasing by 18.98%. The fatigue life of TC4 titanium alloy increases from 10762 times to 56220 times under the conditions of stress ratio of 0.1 and stress of 610 MPa. The centrifugal barrel finishing can comprehensively improve the surface integrity and tensile fatigue performance of TC4 titanium alloy.