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The hot deformation behaviors of GH4706 alloy were investigated using compression tests in a deformation temperature range from 900°C to 1200°C with a strain rate range of 0.001–1 s-1.Hot processing maps were developed on the basis of the dynamic material model and compression data.A three-dimensional distribution of power dissipation parameter(η) with strain rate and temperature reveals that η decreases in sensitivity with an increase in strain rate and a decrease in temperature.Microstructure studies show that the grain size of GH4706 alloy increases when η is larger than 0.32,and the microstructure exhibits local deformation when η is smaller than 0.23.The hot processing map at the strain of 0.7 exposes a domain peak at η=0.32 for the temperature between 940°C and 970°C with the strain rate from 0.015 s-1 to 0.003 s-1,and these are the optimum parameters for hot working.
The hot deformation behaviors of GH4706 alloy were investigated using compression tests in a deformation temperature range from 900 ° C to 1200 ° C with a strain rate range of 0.001-1 s-1. Hot processing maps were developed on the basis of the dynamic material model and compression data. A three-dimensional distribution of power dissipation parameter (η) with strain rate and temperature reveals that η decreases in sensitivity with an increase in strain rate and a decrease in temperature. Microstructure studies show that the grain size of GH4706 alloy increases when η is larger than 0.32, and the microstructure exhibits a localized deformation when η is smaller than 0.23. The hot processing map at the strain of 0.7 exposes a domain peak at η = 0.32 for the temperature between 940 ° C and 970 ° C with the strain rate from 0.015 s-1 to 0.003 s-1, and these are the optimum parameters for hot working.