Abstract
The high temperature cyclic creep behaviour of a directionally solidified Ni base superalloy has been investigated and compared with constant load creep data. Irrespective of whether holding time is allowed during off loading periods or not, the creep rupture lives are shorter for the cyclic creep. The effect of cyclic loading is to cause further increase in strain rate acceleration. The frequency of load change does not have any significant effect on rupture time. The evolution of the particulate microstructure as well as other transient creep phenomena such as anelasticity have practically no effect on the observed strain rate acceleration. However, the presence of the shrinkage pores and presumably the variation in their size and population introduce some measure of scatter in the rupture lives.
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