Deformation Characteristics and Time-Dependent Notch Sensitivity of Udimet 700 at Intermediate Temperatures

Abstract

Time-dependent notch sensitivity of Udimet 700 sheet, bar, and investment castings was observed between 1000 deg and 1400 deg F (538–760 deg C) but not at 1600 deg F (871 deg C). As was the case for Modified Waspaloy, Waspaloy, René 41, INCONEL 718 and TD-NiCr, it occurred when notched specimens were loaded below the yield strength and when creep deformation was localized. For each γ′ strengthened alloy and notched specimen geometry, a stress-average particle size zone can be defined to characterize the notch sensitive behavior.