Abstract
Center notched sheet samples of INCONEL alloy 718 with thicknesses from 0.5 to 3.1 mm were creep tested in the 595–704°C temperature range. No significant effect of thickness was observed in terms of failure times, minimum stress intensities needed to initiate crack growth, or fracture mode. Flat, intergranular fractures with no shear lips and no detectable change in thickness were observed in all cases. The results indicate that with materials such as nickel-base superalloys tested at half their melting point, creep fractures can be analyzed by fracture mechanics techniques.
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