In order to optimize the milling parameters in milling of TA15 titanium alloy using carbide end cutter

and to control the surface integrity and improve the fatigue life of components

the effects of machined surface integrity on the fatigue life of TA15 titanium alloy were investigated through milling experiments

surface integrity tests

and fatigue tests. The results show that the surface roughness R

a

of TA15 titanium alloy is 0.148–0.245 μm after milling

the maximum residual compressive stress is detected on the surface

the depth of the residual compressive stress affected layer is approximately 30 μm

and the depth of the hardened layer is approximately 70 μm. The fatigue life increases with the decrease of surface roughness and the increase of residual compressive stress. The op

timal combination of milling parameters: milling speed 40 m/min

feed per tooth 0.03 mm/z

and the maximum fatigue life is 4.044×10

5

times. The tensile fracture of the machined TA15 titanium alloy is ductile fracture with deep dimples.