Effect of processing parameters on flow behaviors and microstructure during high temperature deformation of GH4586 superalloy

Abstract

The apparent activation energy for deformation (Q) and strain rate sensitivity (m) of GH4586 superalloy are calculated and the variation trend is reasonably explained by the microstructure observations. Constitutive modelling of this superalloy is established and the processing maps at different strains are constructed. The results show that the Q value is in the range of 751.22–878.29 kJ/mol. At a temperature of 1060 °C, strain rate of 0.001 s⁻¹, and strain of 0.65, the m value of GH4586 superalloy reaches a maximum of 0.42. The optimal processing parameter of GH4586 superalloy is at a deformation temperature of 1050 °C and a strain rate of 0.001 s⁻¹. The domains of flow instability notably expand with increasing strain during high temperature deformation of GH4586 superalloy.

Keywords

GH4586 superalloy / apparent activation energy for deformation / strain rate sensitivity / constitutive model / processing maps

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