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摘要
The isothermal compression experiment of Ti60 alloy was conducted on the Thermecmaster-Z thermal simulator at deformation temperature of 600~950℃, strain rate of 0.001~10 s-1. The hot deformation behavior of Ti60 alloy was investigated by analyzing the flow stress behavior, calculating the strain rate sensitive exponent m and strain hardening exponent n, along with the processing map and deformation microstructure, to optimize processing parameters. The results show that the flow stress-strain curve of Ti60 alloy presents flow steady state and flow softening under different processing parameters. The strain rate sensitivity exponent m increases with the increase of deformation temperature and decrease of strain rate. The strain hardening exponent n decreases with the increase of deformation temperature. With the increase of strain rate, n increases at the low strain rate (0.001~0.1 s-1) and decreases at the high strain rate (1~10 s-1). With the increase of strain, n decreases slowly at the low strain rate (0.001~0.1 s-1) of the high temperature section (800~950℃), while it decreases significantly at high strain rate (1~10 s-1) of high temperature section (800~950℃), or at all the strain rates (0.001~10 s-1) of the low temperature section (600~750℃). Ti60 alloy has two peak power dissipation efficiency regions, whose corresponding processing parameter windows are: temperature 725~875℃, strain rate ≤0.003 s-1 and temperature 875~938℃, strain rate ≤0.04 s-1. Considering the flow stress behavior, strain rate sensitivity exponent m, strain hardening exponent n and processing map, the optimal thermal processing parameters of Ti60 alloy are temperature 800~875℃, strain rate 0.001~0.003 s-1, or temperature 875~938℃, strain rate 0.001~0.04 s-1.
