Creep-Fatigue Interactions in Advanced Eutectic Superalloys.
Final rept. 1 Oct 79-30 Sep 83,
RENSSELAER POLYTECHNIC INST TROY NY DEPT OF MATERIALS ENGINEERING
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This project has been concerned with three facets of cyclic deformation of advanced eutectic composites a high cycle, stress controlled fatigue b stress controlled crack growth c low cycle, strain controlled fatigue. Three alloys were selected for study Nitac 14B, Cotac 744 and AG-170. Experiments have been carried out as a function of several variables temperature, microstructure, and frequency, in order to obtain as complete a picture as possible of the relative advantages and disadvantages of the three alloys under cyclic loading conditions. In addition, the response of these alloys to cyclic deformation has been compared to that of conventional nickel base alloys. Early in the program it was noted that Cotac 744 was inferior in HCF and LCF properties to the other two alloys. Consequently, during the final year of the program LCF and dadN tests were carried out on AG-170 and Nitac 14B only.