Method for connecting superalloy components

摘要

Components (5) in a superalloy, in particular a dispersion hardened nickel based alloy, are connected together by pressure bonding in the solid condition with the greatest possible limitation of the overall deformation of the complete components (5) by lateral restraint (7), the actual bonding zone (6) having short-term intensive dynamic plastic flow imposed on it and, taking account of the deformation temperature, the local deformation rate epsilon l and the local deformation epsilon l referred to the bonding zone (6) are matched together in such a way that the driving force during the subsequent heat treatment of the complete workpiece above the recrystallization temperature is sufficient to force the formation of coarse grain under all conditions. It can then be assumed that, in general, the expression log( epsilon l DNi-1 m2) where <IMAGE> ho=height of the bonding zone (6) before connection, hf=height of the bonding zone (6) after connection, DNi=the temperature dependent diffusion coefficient of Ni, is within the limits 10 and 20. The nickel based superalloys of principal interest should be connected in a maximum total bonding time of 20 s, the average value of epsilon l being at least 0.02 s-1 and epsilon l being at least 0.1.