Abstract
Preliminary indications concerning the applicability of X2095-type alloys for warm temperature applications (125--200 C) are encouraging. The strength capability is clearly demonstrated. Before commitments are made to this alloy system for elevated temperature applications, data need to be gathered on microstructures after long term exposure to the service temperature. Fracture toughness, impact resistance, and creep data are also required to make a complete assessment. The fatigue crack propagation data at 10Hz is also encouraging. More detailed experiments are required to determine the cause for a change in fracture surface morphology compared to room temperature. The fact that these fracture surfaces are so dissimilar, yet the crack propagation rates are nearly identical (in the near threshold region) is perplexing. Additional data are required at lower frequencies and tensile hold times to assess the influence of creep-environment-fatigue interactions, and their impact on component life at these service temperatures.
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