Thermal deformation behavior of as-cast and as-forged GH4738 alloy

doi:10.13251/j.issn.0254-6051.2021.12.008

Abstract

Abstract: By using MTS thermal simulator, compression tests were carried out on the as-cast and as-forged GH4738 alloy under the conditions of deformation temperature of 1000-1150 ℃ and strain rate of 0.01-1 s^-1, in which the reduction is 10%, 30% and 50%, respectively. The results show that the stress-strain curves of the alloy in two states both have typical characteristics of dynamic recrystallization, and there are three stages: work hardening, flow softening and steady-state flow. According to the stress-strain curves, the thermal deformation activation energies of as-cast and as-forged GH4738 alloy are Q=575.89 kJ/mol and Q=588.04 kJ/mol, respectively. The EBSD analysis shows that the dynamic recrystallization of as-forged GH4738 alloy occurs earlier and more significantly than that of as-cast alloy under the same thermal deformation parameters.

Key words: GH4738 alloy, thermal simulation, thermal deformation behavior, constitutive equation

CLC Number:

TG132.3

Su Xing, Lü Xudong. Thermal deformation behavior of as-cast and as-forged GH4738 alloy[J]. Heat Treatment of Metals, 2021, 46(12): 46-52.

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