Eignespannungsprofile oberflächen-verformter TiAl6v4-Proben

The lifetime of dynamically loaded components enlarges by optimized surface treatments like grinding, shot and roll peening. Besides strain hardening and densifying of the surface regions the production of compressive residual stresses (RS) plays an important role especially for high-strength materials. The enhancement is of big effect in notches and their surroundings. The knowledge of origin, profile and parameters of RS were mainly investigated on steels and sintered materials. Results on the important titanium alloy TiAl6V4, crystallizing in the hexagonal system, are known of shot peening and grinding, but only two RS-profiles after roll peening are published. In this paper the effect of roll peening on the RS-profiles on ground, unnotched specimens will be underlined varying the grinding state, the rolling force and the number of passes. Results of orientation-dependent lattice-strain measurements on one shot-peened specimen will be given. They enable to determine the relative X-ray elastic constants.