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

摘要

The invention relates to edge layer finishing of functional components, and thereby in particular to a method for producing wear-resistant and fatigue-resistant edge layers in titanium alloys, and components produced therewith. The method according to the invention for producing wear-resistant and fatigue-resistant edge layers in titanium alloys by means of laser gas alloying is essentially characterized in that the laser gas alloying is carried out with a reaction gas that contains or releases interstitially soluble elements in the titanium alloy used, whereby the partial pressure of the reaction gas is selected such that the partial pressure remains below the threshold value above which nitride, carbide, or boride titanium phases are produced. The features according to the invention of the wear-resistant and fatigue-resistant component made of a titanium alloy with a gas-alloyed edge layer essentially are that the wear-resistant edge layer is composed of a fine-grain mixture of alpha- and beta-titanium grains with an interstitially dissolved reaction gas, has a surface hardness H_s, measured on the ground surface, of 360 HV0.5<=H_s<=500 HV0.5, or an edge layer microhardness 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, oxide, or boride phases produced by the reaction gas.