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Wrought superalloys that are capable of high strengths at room and elevated temperatures are characterized by complex alloy compositions and phase relationships. Alloy composition establishes which phases will occur, and composition control is critical to assure consistent phase boundary relationships. This presentation discusses the metallurgy of several important superalloys including: A-286, Alloy 901, Alloy 718, Waspaloy and René 95; and two new wrought superalloys, Pyromet CTX-1 and Pyromet 31. The achievement of property goals in these alloys, for various applications, is shown to be related to proper selection of process parameters with respect to phase relationships.
steels, microstructure, heat resistant alloys, precipitation hardening, phase diagrams, phase transformations, process variables
Division vice president, Technical, Carpenter Technology Corporation, Reading, Pa.