在Gleeble-1500D热模拟试验机上,通过高温等温压缩试验,对Cu-2.0Ni-0.5Si-0.03P合金在应变速率为0.01～5 s-1、变形温度为600～800℃的动态再结晶行为以及组织转变进行了研究。结果表明：在应变温度为750、800℃时,合金热压缩变形流变应力出现了明显的峰值应力,表现为连续动态再结晶特征。同时从流变应力、应变速率和温度的相关性,得出了该合金高温热压缩变形时的热变形激活能（Q）为485.6 kJ/mol和热变形本构方程。根据动态材料模型计算并分析了该合金的热加工图,利用热加工图确定热变形的流变失稳区,并且获得了试验参数范围内热变形过程的最佳工艺参数,温度为750～800℃,应变速率范围为0.01～0.1 s-1,并利用热加工图分析了该合金不同区域的高温变性特征以及组织变化。
High temperature compressive experiments of Cu-2.0Ni-0.5Si-0.03P alloy at temperature of 600-800 ℃ and strain rate of 0.01-5 s-1 were performed on a Gleeble-1500D thermal-mechanical simulator,and the dynamic recrystallization behavior and structure transformation of the alloy were studied.The results show that when the deformation temperature is 750 ℃ and 800 ℃,the flow stress decreases after a peak value,showing continuous dynamic recrystallization.The hot deformation activation energy Q is 485.6 kJ/mol,and constitutive equations are obtained from the correlativity of flow stress,strain rate and temperature.Taking into consideration of the effects of the deformation temperature and the stain rate,processing maps are established based on the dynamic material model.The instability zones of flow behavior could be recognized by the plans.The optimum processing parameters of hot deformation in the range of this experiment can also be attained by the maps,in which the hot temperature is 750-800 ℃ and the strain rate is 0.01-0.1 s-1.The hot deformation characteristics and microstructure are analyzed by the processing maps.
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