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采用Gleeble-1500D热模拟试验机,研究了Cu-0.8Cr-0.3Zr合金在变形温度为650~950℃、应变速率为0.001~10 s-1、总压缩应变量60%条件下的流变行为,对热变形过程中的组织演变和动态再结晶机制进行了分析,同时分析了该合金的热加工图。结果表明,变形温度越高,应变速率越小,合金越容易发生动态再结晶,且对应的峰值应力也越小。利用逐步回归的方法建立该合金的流变应力方程。绘制了Cu-Cr-Zr合金的热加工图,确定了其热加工时的安全区与失稳区,得出了该合金在实验参数范围内热变形过程的最佳工艺参数:温度范围为850~900℃,应变速率范围为0.1~1 s-1。
The rheological behavior of Cu-0.8Cr-0.3Zr alloy under the conditions of deformation temperature of 650-950 ℃, strain rate of 0.001-10 s-1 and total compressive strain of 60% was studied by using Gleeble-1500D thermal simulation tester. , The mechanism of microstructure evolution and dynamic recrystallization during hot deformation was analyzed, and the hot working diagram of the alloy was also analyzed. The results show that the higher the deformation temperature is, the smaller the strain rate is. The more the alloy recrystallizes dynamically and the corresponding peak stress decreases. The stepwise regression method was used to establish the flow stress equation of the alloy. The hot working diagram of Cu-Cr-Zr alloy was drawn and the safe zone and destabilization zone of the Cu-Cr-Zr alloy were drawn. The optimum technological parameters of the alloy in the process of thermal deformation were obtained: the temperature range is 850 ~ 900 ℃, the strain rate range of 0.1 ~ 1 s-1.