Abstract:Hot compression tests for GH4706 alloy were performed at a true strain of 1.2 within the temperature range of 950–1150 °C and the strain rate range of 0.001–1 s-1. The optimal hot deformation temperature and strain rate range were determined using nephogram maps of dynamic recrystallization fraction, average grain size, and grain distribution standard deviation. Processing maps at true strains from 0.4 to 0.9 were generated based on flow stress curves to identify the strain corresponding to optimal microstructure homogenization efficiency at various temperatures and strain rates. Results show that within the optimal parameter range, under the conditions of 1150 °C and 0.01 s-1, the true strain of about 0.6 results in the optimal microstructure homogenization efficiency. The grain orientation spread maps obtained from the experiment also confirms this conclusion. This study provides an effective method for microstructure homogenization control of GH4706 alloy and an effective reference for the minimum strain threshold of the local part of the forging in engineering.