Effects of SMAT at cryogenic and room temperatures on the kink band and martensite formations with associated fatigue resistance in a ?-metastable titanium alloy

Surface Mechanical Attrition Treatment (SMAT) has been carried out at cryogenic and room temperatures on a 5553 ?-metastable Ti alloy to describe its effects the modification of microstructure fatigue properties. The temperature promoted martensitic transformation width kink bands produced by SMAT. formation was high strain rates SMAT process. samples SMATed showed an increase in resistance, about 8 % , compared processed temperature. This improvement possibly due combination several factors: compressive residual stresses, lower roughness, deeper martensite larger bands. On contrary, did not provide any terms polished condition. large grain size provoked appearance subsurface crystallographic defects which primary cracks initiated. greatly limited effectiveness reinforced surface layer • Kink generated induced A band density first ?m surfaces. Deeper roughness for Increased resistance