Mechanical surface treatments on Ti–10V–2Fe–3Al for improved fatigue resistance

Shot peening as well as deep-rolling of circumferentially V-notched (kt=2.5) specimens was performed on fully aged Ti–10V–2Fe–3Al with 15% equiaxed primary-α content. To evaluate optimum conditions for fatigue life improvement, the Almen intensity and rolling force were varied to a wide extent for shot peening and deep-rolling, respectively. While both shot peening and deep-rolling significantly improve the fatigue performance of the notched electropolished reference, best results are found for deep-rolling. Under optimum process conditions, the fatigue strength can be increased by a factor of 2.5, i.e. the geometrical notch factor (kt) is fully counterbalanced.