Vevorzugte Randschichtaushärtung : Neue Verfahren zur Verbesserung des Dauer-schwingverhaltens mechanisch belasteter Bauteile

Certain age-hardenable alloys, for example, selected aluminium and titanium alloys as well as precipitation hardening steels, are amenable to a novel method for improving fatigue behavior called preferential surface aging. First, a mechanical surface treatment such as shot peening or surface rolling is applied to induce cold work in the skin«. Then, an aging treatment is carrried out such that the age hardening reaction is much more pronounced in the skin than in the bulk. Advantages of this method are that it can offer higher ductilities than a high strength conventionally aged condition, while endurance limits are even higher than after conventional mechanical surface treatments