Microstructure evolution and temperature field simulation of Inconel 718 super alloy during isothermal compression

doi:10.13251/j.issn.0254-6051.2023.05.024

Abstract

Abstract: Microstructure evolution and temperature field simulation of the Inconel 718 superalloy in the temperature range of 950-1150 ℃ and strain rate range of 0.1-10 s^-1 were investigated by means of Gleeble 3800 thermal compression tester, Deform-3D finite element software and optical microscope. The results show that at low deformation temperature and high strain rate, the flow stress increases rapidly to the peak at the initial stage with the increase of deformation strain. After reaching the peak stress, the flow curve exhibits an obvious softening phenomenon. Also at low deformation temperature and high strain rate, the deformation heat is larger, leading to a fact that dynamic recrystallization is prone to occur in the deformed alloy, the dynamic recrystallization degree is higher, and the grain size is smaller. As the strain rate decreases, the deformation heat decreases gradually, and the volume fraction of dynamic recrystallization grains decreases. When deformed at 1100 ℃ and 0.1 s^-1, the full dynamic recrystallization occurs in the deformed alloy. Based on the results of the temperature field distribution simulated by Deform-3D software, it can be seen that the hot deformation conditions of low temperature and high strain rate will produce large deformation heat in the deformed alloy. With the increase of deformation temperature and the decrease of strain rate, the value of deformation heat gradually decreases. When the deformation temperature and strain rate are constant, the deformation heat in the alloy increases with the increase of true strain.

Key words: Inconel 718 superalloy, hot deformation, dynamic recrystallization, temperature field

CLC Number:

TG31

Wang Chao, Ren Yonghai, Han Senlin, Cheng Zhi, Wang Longxiang, Zhao Fei, Tan Yuanbiao. Microstructure evolution and temperature field simulation of Inconel 718 super alloy during isothermal compression[J]. Heat Treatment of Metals, 2023, 48(5): 151-157.

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