Heat treatment method for bodies that consist of a nickel base superalloy

摘要

In a heat treatment process for a single-crystal or directionally solidified material body comprising a nickel-based superalloy, the material body is solution-annealed and then at a first temperature gamma' particles of greater than 1 mum are precipitated in a proportion by volume with Vtot-V1 of less than 50%, where Vtot is the total amount of gamma' particles after complete heat treatment and V1 is the proportion of the gamma' particles which is greater than 1 mum, and at least at a second temperature 'gamma' particles of less than 1 mum are precipitated. The gamma' particles are preferably precipitated in a size of 2 pin or more with a proportion by volume of 0.25<(Vtot-V1)/(100-V1)<0.55 at the first temperature. The proportion by volume Vtot of the gamma' particles will be at least 50%.