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采用Gleeble-3500热模拟试验机研究了微碳钢在700～1100℃、0.01～10 s-1条件下的热变形行为。确定了其在铁素体区和奥氏体区的热变形方程。建立了微碳钢在不同应变量下的热加工图(Processing Map)。结果表明,在铁素体区和奥氏体区,试验钢的峰值应力大小基本相当;试验钢在铁素体区和奥氏体区的热变形激活能分别为302 kJ/mol和353 kJ/mol;不同真应变下的热加工图相似,当变形温度为875℃,应变速率为0.01 s-1时,能量消耗效率达到最大值为0.5。
The hot deformation behavior of micro-carbon steel at 700 ~ 1100 ℃ and 0.01 ~ 10 s-1 was studied by Gleeble-3500 thermal simulator. The thermal deformation equations in the ferrite and austenite regions were determined. The processing map of micro-carbon steel under different strain was established. The results show that the peak stress of the test steel is basically the same in the ferrite and austenite regions. The thermal deformation activation energy of the test steel in the ferrite and austenite regions is 302 kJ / mol and 353 kJ / mol. The thermal processing at different true strain is similar. When the deformation temperature is 875 ℃ and the strain rate is 0.01 s-1, the maximum energy consumption efficiency is 0.5.