利用Thermecmastor-Z热模拟试验机,得到了Fe16Mn0.6C TWIP钢在变形温度850～1150℃,应变速率0.03～30 s~(-1)条件下热压缩变形的真应力应变曲线.进而研究了变形温度、应变速率对Fel6Mn0.6C钢流变应力和临界动态再结晶行为的影响规律.结果表明,850～1150℃范围内Fe16Mn0.6C钢热变形的峰值应力随温度的升高而降低,随着应变速率的增大而升高;且在应变速率为0.03 s~(-1)和30 s~(-1)出现明显的应力峰值,材料发生了动态再结晶.最后采用线性回归方法计算出Fe16Mn0.6C钢的高温变形流变应力本构方程,得出热变形激活能为469 kJ/mol;并通过应变硬化速率与流变应力曲线求出了该钢种动态再结晶临界条件与Z参数之间的关系.
The true stress-strain curve of Fel6Mn0.6C TWIP steel was studied with a compression test on Ther-mecmastor-Z thermal simulator in the temperature range of 850-1150℃and strain rate range of 0.03-30 S~-1.The influences of deformation temperature and strain rate on high temperature flow stress and critical recrystallization behavior of the TWIP steel were investigated.It was concluded that the peak flow stress of Fe16Mn0.6C under high temperture deformation was decreased as the temperature increased and,on the other hand,it was evalua ted as the strain rate increased;meanwhile at strain rate of 0.03 s~(-1) and 30 s~(-1) the obvious peak stresses were observed which demonstrated dynamic recrystallization.The constitutive equation of Fe16Mn0.6C under high tem perature deformation was calculated by linear regression.The activation energy was 469 kJ/mol.The relationship between critical strain of dynamic revrystallization and Zener-Hollomon parameter was determined by θ(strain-hardening rate)-σ(flow stress)curve.
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