Abstract
The deformation behavior of NIMONIC 80A was studied in the high temperature range of <TEX>$900{\sim}1200^{\circ}C$</TEX> and for strain rates varying between 0.02 and <TEX>$20s^{-1}$</TEX> via the hot compression test. Processing maps for hot working were constructed on the basis of the power dissipation efficiency using a dynamic material model. The results showed that the strength during hot compression increased with increasing strain rate and decreasing temperature. At low strains, the processing map of NIMONIC 80A did not reveal any instability domain regardless of the strain rate and temperature. However, at high strains, the processing map exhibited an instability domain at a low strain rate of <TEX>$0.2s^{-1}$</TEX> and within a temperature range of <TEX>$900{\sim}960^{\circ}C$</TEX>. In the instability domain, the deformed microstructure exhibited shear bands and carbide precipitation while, in the safe domain, full recrystallization occurred.
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