DEVELOPMENT OF HIGH TEMPERATURE CAPABILITY P/M DISK SUPERALLOYS

摘要

A study was conducted to optimize the major element chemistryof powder metallurgy (PM) alloys for the challenging goals of aHigh Speed Civil Transport (HSCT) application. Two iterationswere performed. Subscale heats of experimental powders wereatomized, consolidated by extrusion, isothermally forged, andsupersolvus heat treated. Key relationships were identifiedbetween alloying elements resulting in the identification of anoptimized alloy composition. The final alloy showed significantimprovements in creep and in hold time crack growth comparedto state-of-the art commercial alloys.