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利用Gleeble-1500D热模拟试验机,采用高温等温压缩试验,对Cu-0.4Cr-0.15Zr-0.04Y合金在应变速率为0.001~10 s-1、变形温度为650~850℃、最大变形程度为50%条件下的动态再结晶行为以及组织转变进行了研究。利用加工硬化率和应变(θ-ε)的关系曲线确定了该合金发生动态再结晶的形变条件为T≥750℃,应变速率小于0.1 s-1;根据θ-σ模型,确立了合金变形特征参数之间的关系:σc/σp=0.86,εc/εp=0.30;同时建立了合金变形特征参数与Z参数的关系:εp=2.61×10-3Z0.14,εc=7.83×10-4Z0.14。Cu-0.4Cr-0.15Zr-0.04Y合金在热变形过程中的动态再结晶机制受变形温度和应变速率的控制。当温度达到850℃,应变速率为0.001 s-1时,合金发生完全的动态再结晶。
The deformation of Cu-0.4Cr-0.15Zr-0.04Y alloy at a strain rate of 0.001-10 s-1 and a deformation temperature of 650-850 ° C was investigated by using a Gleeble-1500D thermal simulation tester with a high temperature isothermal compression test. The maximum deformation was 50% of the dynamic recrystallization behavior and organizational changes were studied. The relationship between work-hardening rate and strain (θ-ε) was used to determine the dynamic recrystallization of the alloy under the conditions of T≥750 ℃ and strain rate of less than 0.1 s-1. According to θ-σ model, the alloy deformation characteristics The relationship between the parameters is: σc / σp = 0.86, εc / εp = 0.30. At the same time, the relationship between the deformation parameters and Z parameters is established: εp = 2.61 × 10-3Z0.14, εc = 7.83 × 10-4Z0.14 . The dynamic recrystallization mechanism of Cu-0.4Cr-0.15Zr-0.04Y alloy during hot deformation is controlled by deformation temperature and strain rate. When the temperature reaches 850 ℃ and the strain rate is 0.001 s-1, the alloy undergoes complete dynamic recrystallization.