REVIEW OF RECENT DEVELOPMENTS. NICKEL-BASE AND COBALT-BASE ALLOYS,

This is a brief review of recent developments in nickel-base and cobalt-base alloys. Rene 62 sheet is reported to be resistant to weld cracking. This characteristic, combined with somewhat higher strength than Inconel Alloy 718, makes Rene 62 a promising sheet material for service up to 1500 F. For the manufacture of superalloy filaments up to 100 feet in length by cold stretching, Elgiloy wire was selected for the preliminary development work because of its high room-temperature ductility and availability. Reductions in area of up to 50 were made on 10mil-diameter wire 40 reductions on 3-mil-diameter wire and up to 30 reductions on 1-mildiameter wire. The goal of producing 12-mildiameter wire was not reached. Studies on the influence of forging temperature on the distribution and identity of the carbide phases in Waspaloy indicated that hot work history is a critical determinant in the microstructure of heat-treated wrought Waspaloy and presumably other superalloys. Typical composition and characteristic rupture strength of the nickelbase alloy SM 211 were tabulated. Author