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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。
The dynamic recrystallization behavior of Cu-2.0Ni-0.5Si-0.03P alloy at strain rate of 0.01 ~ 5 s-1 and deformation temperature of 600 ~ 800 ℃ was investigated on a Gleeble-1500D thermal simulator by high temperature isothermal compression test As well as organizational changes have been studied. The results show that at the temperature of 750 and 800 ℃, the peak compressive stress of the hot deformation occurs obvious peak stress, showing continuous dynamic recrystallization characteristics. At the same time, the thermal deformation activation energy (Q) was 485.6 kJ / mol and thermal deformation constitutive equation was deduced from the correlation between flow stress, strain rate and temperature. According to the dynamic material model, the hot working diagram of the alloy was calculated and analyzed. The hot deformation of the alloy was determined by the hot working drawing. The optimum parameters of the hot deformation during the test parameters were obtained. The temperature was 750-800 ℃ , Strain rate range of 0.01 ~ 0.1 s-1, and the use of hot working diagram analysis of the different regions of the alloy high temperature degeneration characteristics and organizational changes.