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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-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℃、最大变形程度为60%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≥700℃。根据σ-ε曲线确定了不同变形条件下该合金的动态再结晶的体积分数,利用该体积分数建立了该合金的动态再结晶动力学数学模型。该合金动态再结晶的显微组织受变形速率的影响,在变形速率较低时,晶体内有较多的再结晶晶粒;而在较高应变速率下,合金几乎没有发生动态再结晶。
The deformation of Cu-2.0Ni-0.5Si-0.03P alloy at the strain rate of 0.01-5 s-1 and the deformation temperature of 600-800 ℃ were investigated by using Gleeble-1500D thermal simulation testing machine. The maximum deformation was 60% of the dynamic recrystallization behavior and organizational changes were studied. Using the relationship between work hardening rate and strain (θ-ε), the deformation condition of dynamic recrystallization of the alloy was determined as T ≥ 700 ℃. According to the σ-ε curve, the volume fraction of dynamic recrystallization of the alloy under different deformation conditions was determined. Based on the volume fraction, the dynamic recrystallization kinetic model of the alloy was established. The dynamic recrystallization of the alloy microstructure affected by the deformation rate, the deformation rate is low, the crystal has more recrystallized grains; and at higher strain rates, the alloy almost no dynamic recrystallization.