METHOD FOR PRODUCING WEAR-RESISTANT AND FATIGUE-RESISTANT EDGE LAYERS FROM TITANIUM ALLOYS, AND CORRESPONDINGLY PRODUCED COMPONENTS

摘要

The invention relates to the edge layer finishing of functional components, and especially to a method for producing wear-resistant and fatigue-resistant edge layers from titanium alloys, and correspondingly produced components. The inventive method for producing wear-resistant and fatigue-resistant edge layers in titanium alloys by means of laser glass alloying is essentially characterised in that the laser glass alloying is carried out by means of a reaction gas that contains or releases interstitially soluble elements in the used titanium alloy. The partial pressure of the reaction gas is selected in such a way that it remains below the threshold value above which nitride, carbide or boride titanium phases are produced. The inventive wear-resistant and fatigue-resistant component consisting of a titanium alloy with a glass-alloyed edge layer is characterised in that the wear-resistant edge layer consists of a fine-grain mixture of a-titanium and ß-titanium grains containing an interstitially dissolved reaction gas, having a surface hardness H_s, measured on the polished surface, of 360 HV0.5 = H_s = 500 HV0.5, or an edge layer micro-hardness H_R, measured on a polished cross-section at 0.1 mm below the surface, of 360 HV0.1 = H_R = 560 HV0.1, extends over a depth t_R of 0.1 mm = t_R = 3.5 mm, and does not contain any nitride, carbide, or boride phases produced by the reaction gas.