Low Cycle Fatigue Behavior of Several Typical Powder Metallurgy Superalloys
Powder metallurgy superalloy has become the preferred material of aircraft engine turbine disc and turbine damper due to advantages of uniform structure, fine grain size, high yield strength, high fatigue strength, etc. The low cycle fatigue behavior of several typical powder metallurgy superalloys at different holding time was studied in this work. The analysis of the microstructure, curves of Lga-LgNi/Nf, da/dN-a and da/dN-N indicated the ratio of crack preparation, initiation, propagation and final fracture in whole process fatigue failure. The mechanism of fatigue crack growth was investigated by comparing the chemical composition, microstructure, fracture morphology of different alloys.
Yafang Han, Qiang Zhang and Bin Jiang
Q. L. Nai et al., "Low Cycle Fatigue Behavior of Several Typical Powder Metallurgy Superalloys", Materials Science Forum, Vol. 816, pp. 634-640, 2015