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在Gleeble-1500D热/力模拟试验机上进行高温等温单道次压缩试验,探讨Cu-0.8Cr-0.3Zr-0.03P合金在变形温度和应变速率分别为650~950℃和0.001~10 s-1条件下的热变形特性。通过真应力-真应变曲线的采集数据计算出合金高温热压缩时的本构方程和热变形激活能Q,根据动态模型绘制真应变为0.3和0.5的热加工图,并结合显微组织分析合金的变形机理,确定热加工失稳区间。研究表明:功率耗散因子η随变形温度递升呈增大趋势,合金的流变软化机理由动态回复逐渐向动态再结晶转变。得出热压缩过程的的最优加工范围为:温度为730~875℃,应变速率为0.1~1 s-1。
High-temperature isothermal single-pass compression tests were carried out on a Gleeble-1500D hot / force simulator to investigate the effects of deformation temperature and strain rate on the Cu-0.8Cr-0.3Zr-0.03P alloy at 650-950 ℃ and 0.001-10 s-1 Under the conditions of thermal deformation characteristics. The constitutive equation and thermal deformation activation energy Q at high temperature hot compression of the alloy were calculated from the true stress-strain curves. According to the dynamic model, the hot working diagrams with true strain of 0.3 and 0.5 were drawn, and the microstructure analysis of alloy The deformation mechanism to determine the thermal processing instability range. The results show that the power dissipation factor η increases with the increase of deformation temperature, and the rheological softening mechanism of the alloy changes gradually from dynamic recovery to dynamic recrystallization. The optimal processing range of hot compression process is obtained as follows: the temperature is from 730 to 875 ℃ and the strain rate is from 0.1 to 1 s-1.