Thermomechanical and isothermal fatigue behavior of bare and coated superalloys

Article Abstract:

Thermomechanical fatigue (TMF) and isothermal fatigue (IF) experiments on bare Mar-M246, and coated Mar-M247 nickel based superalloys display intergranular cracking during in-phase TMF loading. The superalloys display cyclic softening from the first cycle. The fatigue lives of Mar-M247 are independent of the protective coating. The Mar-M246 material exhibits considerable surface oxidation, crack tip oxidation and a gamma depleted zone near the oxide layer. The coated Mar-M247 subjected to in-phase TMF loading shows multiple cracks at the coating/surface interface.

Electrolysis, Heat resistant alloys, Superalloys

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A methodology for predicting variability in microstructurally short fatigue crack growth rates

Article Abstract:

Fatigue cracks growing at the microstructural level were simulated by a finite element model which applies the single crystal constitutive relationships. Plastic deformation or slip was permitted along two specified microscopic crystallographic planes. As the orientations of the slip systems were altered, several crucial fatigue crack growth parameters were found to vary. Crack growth laws were employed to estimate the expected changes in crack growth rates when microstructurally short cracks grow through grains with different crystallographic orientations.

Analysis, Usage, Crystals, Finite element method

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Effect of cycle history on thermomechanical fatigue response of nickel-base superalloys

Article Abstract:

Research reveals that under similar conditions thermomechanical fatigue response tests depend on the R ratio of the test samples. The inelastic strain range can be used to correlate life of tests provided the temperature is held the same. Implications of the findings in thermomechanical fatigue testing are discussed.

Netherlands, Testing, Metals, Metal fatigue, Thermal analysis, Nickel alloys

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