Hot Deformation Behavior and Hot Processing Maps of Triple-Smelted GH4710 Alloy After Extrusion
The hot deformation behavior of as-extruded GH4710 alloy prepared by vacuum induction melting(VIM)+electroslag remelting(ESR)+vacuum arc remelting(VAR)triple smelt process was studied by hot compression tests at the temperatures of 1050-1150 ℃ and the strain rate of 0.01-5 s-1.The results show that the stress-strain curves have obvious dynamic recrystallization characteristics,and the stress decreases significantly with the increase in the temperature and the decrease in the strain rate.Based on the compressive true stress vs true strain curves,the critical strain model of dynamic recrystallization was developed.At the same time,the Arrhenius constitutive model considering the influence of strain was established to accurately describe the dependence of alloy stress,strain rate and temperature.Finally,based on the dynamic material model,the thermal processing map of the alloy was constructed,and combined with the microstructure analysis,the theological instability of the alloy was clarified as the uneven microstructure,and the hot working parameters of the as-extruded-triple-smelted GH4710 alloy are suggested to be the deformation temperature of 1050-1100 ℃ and the strain rate of 0.01-0.1 s-1.
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