Effects of cobalt on the hot workability of nickel-base superalloysThe effect of cobalt on the workability of nickel-base superalloys is examined with reference to experimental results for four heats of alloys based on the Nimonic 115 composition with varying amounts of nickel substituted for the nominal 14 percent cobalt. It is shown that Co lowers the gamma-prime solvus, which in turn lowers the Cr23C6 carbide solvus. It is further shown that these solvus temperatures bracket the hot working range for the alloys. However, thermomechanical processing modifications reflecting the effect of Co on the gamma-prime and carbide solvi are shown to restore the workability and the properties of alloys with little or no cobalt.
Document ID
19850050261
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Authors
Jarrett, R. N. (Columbia Univ. New York, NY, United States)
Collier, J. P. (Columbia Univ. New York, NY, United States)
Tien, J. K. (Columbia University New York, NY, United States)