The effect of shot penning on the surface integrity and fatigue life of TC17 alloy was investigated. The effect of shot type and shot peening intensity on surface roughness

residual stress

microhardness

and microstructure was analyzed by using surface roughness tester

a scanning electron microscopy

X-ray diffraction residual stress analyzer

microhardness instrument

etc. The fatigue life before and after shot peening was tested by rotating bending fatigue testing machine. The relationship between surface integrity and fatigue life was discussed. Results show that surface roughness (Ra) of 0.5~1.0μm was obtained after shot peening

the thickness of compressive residual stress layer was approximately 100μm

and the maximum compressive residual stress was located at about 30μm depth beneath the surface

work hardening and grain deformation were observed. Compared with the fatigue life of untreated specimens

the longest fatigue life is obtained when utilizing glass shot

then utilizing ceramic shot

last utilizing cast steel shot. The mechanism of improving fatigue life after shot peening is due to the induced deep compressive residual stress layer

high surface hardening degree and surface grain refinement.