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Variations in Nb, Cr, and Fe percent composition of alloy 718 are found to affect segregation, time and temperature of phase precipiation, and ultimately, the mechanical properties of cast alloy 718. Since the Nb participates in all phase precipitation of alloy 718, the Nb content determines the microstructural response for optimum precipitation and mechanical properties. When the Nb content is less than 4 wt%, such as what occurs in whitespots or the dendritic areas of cast alloy 718, the reactions which occur at lower temperatures need longer times than those used for heat treating conventional 718. Room temperature tensile and 12OO"F/90 KS1 stress ruoture tests were run on a modified ( 4 Nb 14 Cr I4 Fe') cast alloy 718 and standard cast 718 compositions. Wh.en both alloys were given a standard aging treatment of 14OO"F/5 hours, the modified alloy did not meet the stress rupture life or yield strength. However, after an age of 20 hours at 12OO"F, the modified alloy met the required tensile and stress-rupture properties. The mechanical propert es are correlated to the microstructure. Superalloy 7l&Metallurgy and Applications Edited by E.A. Loria The Minerals, Metals & Materials Society, 1989

Effect of Composition on Segregation Microstructures and Mechanical Properties of Cast Alloy 718