T/P PROCESSING - AN ADVANCED P/M SUPERALLOY TECHNIQUE.

Abstract

An economical route for the manufacture of APK1 (a low carbon P/M superalloy) gas turbine discs involving atomization, powder rolling, canning, consolidation, and forging is described. Considerable emphasis is placed on T/P processing by powder rolling which imparts strain energy to the powder. The strain energy resulting from this contamination-free process causes grain refinement as the powder is heated for consolidation. The as-HIPed compact can be isothermally forged (i. e. , superplastic or slow strain-rate pressing). The ability to consolidate T/P processed powder at lower temperatures also reduces the amount of interstitial phases which form on the powder surface during heating of the powder.