The hot deformation characteristics of GH738 superalloy over the temperature range of 1 000 °C to 1 200 °C and strain range of 0.01 s?1to 10.0 s?1under a strain of 1.0 s?1 were investigated through hot compression tests with a Gleeble-1500 simulation machine. The lfow stress reached peak value before lfow softening occurred. The average apparent activation energy (Q) of GH738 was calculated to be 430 kJ/mol, and the stress index (n) is approximately 4.08. The processing map was developed based on lfow stress data and dynamic materials model (DMM). The map shows a dynamic recrystallization (DRX) domain in 1 050 °C to 1 150 °C and 0.01 s?1 to 1.0 s?1 strain rate range with a peak efifciency of 45%, which is considered to be the optimum region for hot working. Moreover, the materials undergo lfow instability in the temperature range of 1 000 °C to 1 050 °C and strain range of 1.0 s?1to 10.0 s?1, and adiabatic shear bands can be observed in this domain.
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