Study on hot deformation behavior of cast alloy GH706

The stress-strain curves of cast alloy GH706 were obtained based on the data of compression tests from thermo-simulation under the condition of temperatures 1100- 1090 ℃ and strain rates 0. 01- 1 s- 1,and the characteristics and cause of the stress-strain curves were analyzed. Compared with the forging material,cast material is easy to produce the work hardening at high strain rates. The linear regression analysis of experimental data was carried out by Arrhenius model,the constitutive equation of cast alloy GH706 under the strain range of 0. 2- 0. 8 was established,and the maximum relative error between calculated value and experimental value is 13. 1%. Furthermore,the constitutive equations of cast alloy GH706 at the strain range of 0- 0. 2 was built by Voce equation,the average relative error between calculated value and experimental value is 0. 2%,which shows the work hardening behavior of cast alloy GH706 at the low strain rates well.