SEDL / STP / STP612-EB / STP27887S

Thermal-Stress Fatigue Behavior of Twenty-Six Superalloys

Bizon, PT
Materials engineer and fatigue branch consultant, National Aeronautics and Space Administration Lewis Research Center, Cleveland, Ohio

Spera, DA
Materials engineer and fatigue branch consultant, National Aeronautics and Space Administration Lewis Research Center, Cleveland, Ohio

Pages: 17    Published: Jan 1976

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Abstract

The comparative thermal-stress fatigue resistances of 26 nickel- and cobalt-base alloys were determined by fluidized bed tests. Cycles to cracking differed by almost three orders of magnitude for these materials, with directional solidification and surface protection showing definite benefit. The alloy-coating combination with the highest thermal-stress fatigue resistance was directionally solidified NASA TAZ-8A with an RT-XP coating. Its oxidation resistance was also excellent, showing approximately a ½ percent weight loss after 14 000 fluidized bed cycles.