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分别以1020℃保温30min后空冷和炉冷得到的TA15合金为原材料,对其进行等温恒应变速率压缩试验,研究了温度800～950℃、应变速率0.001～1s-1、真应变0.51～1.20时,不同原始α片层厚度对TA15合金动态球化行为的影响。结果表明:真应力-真应变曲线均呈现出明显的流动软化,峰值应力和流动软化率对α片层厚度的依赖程度较小。当热变形参数相同时,细片状比粗片状组织更容易发生动态球化,这与其在试验范围内测得的变形激活能分别为597kJ/mol和650kJ/mol是一致的。TA15合金中片状α除了形成低和高角度界面及强烈的局部剪切带导致动态球化外,还有动态再结晶等其它方式。
TA15 alloy, air-cooled and furnace-cooled, respectively, was used as the raw material at 1020 ℃ for 30min and then was subjected to isothermal constant strain rate compression test. The effects of temperature at 800-950 ℃, strain rate 0.001-1s-1 and true strain 0.51-1.20 The effect of different initial α lamella thickness on the dynamic spheroidization of TA15 alloy was investigated. The results show that the true stress - true strain curves show obvious flow softening, and the peak stress and flow softening rate have less dependence on the thickness of α sheet. When the thermal deformation parameters are the same, fine flakes are more susceptible to dynamic spheroidization than the coarse flake, which is consistent with their measured deformation activation energies of 597 kJ / mol and 650 kJ / mol, respectively, within the experimental range. TA15 alloy sheet α in addition to the formation of low and high angle interface and a strong local shear zone led to dynamic ball, there are other ways such as dynamic recrystallization.