医用钛合金表面纳米化组织与性能研究OA

In this study,surface of type near β-type TLM titanium alloy samples were subjected to high-energy shot peening treatment at different time.The microstructure and mechanical properties of the samples after different shot peening time were observed using metallographic microscopy(OM),scanning electron microscopy(SEM),X-ray diffraction(XRD),and microhardness testing.Research has shown that nanocrystallization occurs near the surface of samples after shot peening,forming a certain thickness of nanocrystalline layer.As the duration of the shot peening treatment increases,the average grain size of the surface layer decreases,and the grain size has a gradient change along the thickness direction.The further away from the shot peening surface,the larger the grain size will be.Moreover,compared with that of the matrix,the microhardness of the nanocrystalline layer significantly improves.The greater the distance from the surface is,the lower the microhardness.The increase in hardness is mainly due to the strengthening effect of surface grain refinement.