Effects of Pulse Current on Dynamic Recrystallization Behavior of GH4169 Superalloy

Abstract

The pulse current was applied on the GH4169 alloy during tensile tests at 800°C. The effects of pulse current on the deformation behavior and recrystallization of the alloy were investigated, and the mechanisms were also discussed. The results show that the deformation resistance decreases and the elongation increases significantly by applying the pulse current during tensile tests of the alloy. And the effects of pulse current on the strength and plasticity of the alloy are more remarkable as the pulse current energy increases. It is found that the deformation resistance of the alloy can be decreased since the dislocation motion can be promoted during the tensile testing. The initial temperature of recrystallization can be reduced by the electric effect of the pulse current and the dynamic recrystalllization nucleation is promoted. Therefore, the dynamic recrystallization would occur at lower temperature than that of the alloy without pulse current. That is the main reason for the decreasing of deformation resistance and the increasing of plastic deformation ability of GH4169 alloy under the pulse current.