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The dislocation substructures developed after small-strain (0.5%) creep at 650°C and 121.6 ksi in Rene 88 DT have been analyzed using conventional and high resolution transmission electron microscopy. Clear differences in creep strength and substructures have been observed for samples heat treated with two different cooling rates from the supersolvus heat treatment temperature. For the more rapidly cooled (400°F/min) microstructure exhibits very low initial creep rates, and deformation microtwinning is the dominant deformation process. For the more slowly cooled (75 °F/min) microstructure, the creep rate is much faster, and isolated faulting of individual secondary  ’ precipitates is observed. The detailed mechanisms by which these two mechanisms proceed is discussed, and a possible explanation for the transition in creep mechanism based on the effect of the tertiary  ’ volume fraction is also offered.

Deformation Mechanisms at Intermediate Creep Temperatures in Rene88 DT