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The influences of various conventional and D.S. casting practices, as well as subsequent HIPpinq, on the LCF behaviour of IN-738LC have been assessed by strain controlled testing at 650C and 850C. The greatest resistance to strain cycling was exhibited by the D.S. alloys and is attributed to the beneficial influence of the lm elastic modulus which is associated with the <OOl> directional structure. The conventionally cast materials displayed significant scatter in fatigue life, while the data for the HIPped material lay towards the upper limits of the scatter band for the conventionally cast materials. Fatigue crack initiation occurred preferentially at casting porosity in the unHIPped alloys at both temperatures, although at 650C crack initiation at MC carbide particles was a competitive mechanism. The HIP cycle not only reduced porosity but also provided increased strength at 85OC, both aspects contributing to the improved fatigue life of the HIPped material at this temperature. The beneficial effects of D.S. processing derive primarily from the accorrodation of strain elastically by virtue of the low <OOl> elastic modulus but the reduced porosity and the absence of grain boundaries perpendicular to the applied stress also contribute to the improvaent of fatigue life.

The Influence of Materials Processing on the High Temperature Low Cycle Fatigue Properties of the Cast Alloy IN-738LC