Abstract
During hot working of the recently developed nickel based alloy Allvac 718PlusTM softening kinetics like dynamic, metadynamic as well as static recrystallization govern the microstructure evolution during and after hot forming and hence the final mechanical properties. In this work the metadynamic recrystallization was investigated using double hit compression tests. The classical methodology of offset stress comparison was not usable because of discontinuous yielding of this material. Thus a new method to describe the softening during metadynamic recrystallization was developed, which compares the deformation energy at equal strains, i.e. the area beneath the true strain vs. true stress curve, of the first and second hit as well as at steady state.
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