Volume 31, Issue 2 (March 2003)
Fatigue-Creep Dynamic Strain Rate Map of a Fe-Ni-Cr Alloy with Coarse Branch Crystals
The effect of branch crystals on fatigue-creep deformation behavior of a Fe-Ni-Cr casting alloy has been studied. The different orientations between the branch crystal boundaries and the loading axis played an important role in inducing the deformation process. The fatigue-creep dynamic strain rate curves could be classified into three interaction regions according to the differing stress dependence of the fatigue creep strain rate. A new characteristic strain rate map with three fatigue-creep interaction regions of a Fe-Ni-Cr casting alloy with different branch crystal orientations has been established to provide full information on deformation under a wide range of combinations of fatigue and creep stresses.