CENTRIFUGAL CASTING OF NICKEL BASE SUPERALLOYS WITH INPROVED SURFACE QUALITY, STRUCTURAL INTEGRITY AND MECHANICAL PROPERTIES IN ISOTROPIC GRAPHITE MODULS UNDER VACUUM

摘要

Methods for making various nickel based superalloys into engineering components such as rings, tubes and pipes by melting of the alloys in a vacuum or under a low partial pressure of inert gas and subsequent centrifugal casting of the melt in the graphite molds rotating along its own axis under vacuum or low partial pressure of inert gas are provided. The molds have been fabricated by machining high density , high strength ultrafine grained isotropic graphite, wherein the graphite has been made by isostatic pressing or vibrational molding.