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The feasibility of improving the mechanical properties of nickel base superalloys using multiphase particle strengthening and engineered grain structures was investigated. Five new nickel base superalloys containing dispersions of suitable combinations of y', HfC, and ~203 were designed, manufactured, and evaluated. In general, the y', HfC, and ~203 particle dispersions were selected to provide optimum stress rupture strength levels at low (<1073K or 8OOC), intermediate (1073-1223~ or 800-95OC), and high service temperatures (>1223~ or 95OC). The best mechanical properties were obtained for Alloy 5, which was produced by incorporating fine HfC and Y2O3 particles into the commercial Y-Y' alloy MERL76 using the Rapid Solidification+Mechanical Dispersing technique. After consolidation, zone annealing heat treatments were successfully applied to the alloy to produce large columnar grains by secondary recrystallization for higher temperature stress rupture strength. The engineered grain structures that resulted had an average transverse grain size of approximately 0.7 mm and a grain aspect ratio of greater than ten. The projected 1089K (815C) 1000 hour rupture strength of this alloy was 393 MPa (57 ksi), which is a 14% increase over the 345 MPa value for ~~6000. Since MA6000 and Alloy 5 contained similar y' and oxide particle dispersions, the improved intermediate temperature stress rupture strength of Alloy 5 was thought to have resulted from the dispersion of fine HfC particles. Superalloys 1992 Edited by S.D. Antolovich, R.W. Stusrud, R.A. MacKay, D.L. Anton, T. Khan, R.D. Kissinger, D.L. Klarstmm The Minerals. Metals & Materials Society, 1992

Multiphase Strengthened Nickel Base Superalloys Containing Refractory Carbide Dispersions