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The mechanisms leading to failure during high temperature, LCF and creep-fatigue are presented and discussed for two representative, commercial ODS (Oxide DispersionStrengthened) superalloys, Inconel MA 754 and MA 6000. The fatigue behavior of these alloys is compared with that of conventional (non-ODS) superalloys of nearly identical elemental composition. The behavioral differences may be understood on the basis of the two primary microstructural differences between ODS and non-ODS, namely, grain structure and the fine particle dispersion itself. It is found that recrystallization defects in the form of fine grains are the primary cause of crack initiation in the ODS materials. The results are discussed in light of previous creep and fatigue studies of dispersion-strengthened alloys.

Oxide Dispersion Strengthened Superalloys: The Role of Grain Structure and Dispersion During High Temperature Low Cycle Fatigue