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采用Gleeble-3800热模拟试验机研究Cr20Ni32AlTi合金在不同温度和应变速率条件下的热变形行为及组织变化,讨论了热变形参数对流变应力和显微组织的影响。结果表明,在上述变形条件下,Cr20Ni32AlTi合金的高温热塑性良好,其软化机制与Zener-Hollomon(Z)参数有关,并建立了热变形本构方程,其应力指数为6.37,热变形激活能为491.032 kJ/mol。随Z参数增大,热变形峰值应力增加。
The hot deformation behavior and microstructure of Cr20Ni32AlTi alloy under different temperatures and strain rates were investigated by Gleeble-3800 thermal simulation tester. The effects of thermal deformation parameters on the flow stress and microstructure were discussed. The results show that the high temperature thermoplasticity of Cr20Ni32AlTi alloy is good under the above deformation conditions. The softening mechanism is related to the Zener-Hollomon (Z) parameter and the thermal deformation constitutive equation is established. The stress exponent is 6.37 and the thermal deformation activation energy is 491.032 kJ / mol. As the Z parameter increases, the peak stress of thermal deformation increases.