method to increase the duktilitaet a broad laengsgerichteten stengelfoermigen kristalliten present werkstuecks from a oxyddispersiongsgehaerteten record - number at room temperature.

摘要

Process for increasing the room-temperature ductility of a workpiece composed of oxide-dispersion-hardened nickel-base superalloy and existing as coarse, longitudinally oriented columnar crystallites by subjecting the previously zone-annealed workpiece to a solution anneal in the temperature range between 1,160 DEG and 1,280 DEG C. under argon atmosphere for 1/2 h to 5 h and then to a purposefully chosen cooling down at a rate of 0.1 DEG C./min to 5 DEG C./min to a temperature of 500 DEG to 700 DEG C. Thereafter the workpiece is cooled down to room temperature in air. Preferred purposefully chosen cooling down rate: approx. 0.5 DEG C./min.