Abstract: The present invention relates to a method for producing forged components of a TiAl alloy, in particular turbine blades, wherein the components are forged and undergo a two-stage heat treatment after the forging process, the first stage of the heat treatment comprising a recrystallization annealing process for 50 to 100 minutes at a temperature below the ?/? transition temperature, and the second stage of the heat treatment comprising a stabilization annealing process in the temperature range of from 800° C. to 950° C. for 5 to 7 hrs, and the cooling rate during the first heat treatment stage being greater than or equal to 3° C./sec, in the temperature range between 1300° C. to 900° C.

Abstract: A method and apparatus for surface hardening a component, particularly an aircraft construction component, is disclosed. A force is applied to the surface of the component, which is made of an intermetallic compound at least in the region of the surface to be hardened. The component is heated at least in the region that is made of the intermetallic compound to a temperature higher than the standard temperature. The temperature is set such that a ductility of the intermetallic compound at the temperature is increased compared to a ductility of the intermetallic compound at the standard temperature. The apparatus includes a hardening tool and a heating device where the component is heated to a temperature higher than the standard temperature and the temperature is set such that a ductility of the intermetallic compound at the temperature is increased compared to a ductility of the intermetallic compound at the standard temperature.

Abstract: A method for joining components is described, in particular, for joining a rotor blade to a rotor base member when manufacturing and/or repairing an integrally bladed gas turbine rotor. The method includes the following steps: providing two components to be assembled, respectively joined to one another; providing a joining part; mutually aligning the two components to be assembled and the joining part such that the joining part is positioned as an insert between the two components to be assembled; driving the two components being assembled with the joining part being interposed therebetween in that the joining part to execute a linear, reciprocating motion in opposition to the two stationary components to be assembled in order to generate the frictional motion, further comprising exerting an upsetting force via the joining part on the joint zones between the two stationary components and the joining part, namely in a direction that extends essentially perpendicularly to the frictional motion.

Abstract: The invention is directed to a friction welding process for mounting blades of a rotor for a flow machine. A plurality of oblong welding surfaces are provided at a circumferential surface of a carrier and are respectively welded to a welding surface of a blade. The welding temperature is generated by pressing the welding surfaces together and by an oscillating relative motion between the blade and the carrier in the welding plane. At least the blade or the carrier is additionally heated to a temperature lying below the welding temperature in the region of the welding surface.