The specimen surface roughness

residual stress and working hardening of cast alloy Ti-47.5Al-2.5V-1.0Cr have been investigated by turning

rough grinding and fine grinding. The results reveal that all there exist residual compressive stress in machined specimen surface. With decreasing the surface roughness

the surface residual stress in axial direction is increased while that in radial direction is somewhat changed. The micro-cutting edge is dominant in grinding specimen surface by waterproof abrasive paper

which can remove the hardened layer from turning

resulting in the gradually decrease of surface working hardening degree with the decrease of surface roughness.