Influencia del arenado de la aleación H6AI4V en la dureza subsuperficial y estado de tensiones residuales(•)

Abstract

Sandblasting of Ti6A14V alloy is used to enhance mechanical fixation of the implants. Under the mechanical point of view, such treatment yields a decrease of the fatigue resistance. In this work we evaluate by means of synchrotron radiation the residual stress state in sandblasted specimens and the further relaxation process after a thermal oxidation treatment at 500 °C. It has been found a significant compressive stress gradient with a maximum of about 700 MPa near the surface. Despite the severe deformation experienced by the surface during sandblasting microhardness measurements failed to show any sufsurface hardening. A thermal oxidation treatment (500 °C/1h) of the sandblasted specimen yield the stress relief and a significant subsurface hardening.