论文部分内容阅读
利用Gleeble-1500D热模拟试验机,对Cu-0.2%Zr-0.15%Y合金进行高温热压缩热模拟试验,对合金在应变速率为0.001~1 s-1、变形温度为550~900℃时,试验过程中的流变应力变化、动态再结晶机制及其微观组织变化进行了研究。结果表明,试验合金流变应力受应变温度和变形速率的影响极大,动态再结晶的显微组织对温度的变化反应敏感,当变形温度降低或者应变速率升高时,其流变应力曲线随之上升。通过流变应力、应变速率和变形温度之间的联系,解出了该合金在热压缩变形时的应力指数(n)、应力参数(α)、结构因子(A)、热变形激活能(Q)以及其本构方程。
The hot compression tests of Cu-0.2% Zr-0.15% Y alloy at high temperature were carried out by using Gleeble-1500D thermal simulator. When the strain rate was 0.001-1 s-1 and the deformation temperature was 550-900 ℃, The changes of the flow stress, the dynamic recrystallization mechanism and the microstructure changes during the test were studied. The results show that the flow stress of the test alloy is greatly affected by the strain temperature and the deformation rate. The microstructure of the dynamic recrystallization is sensitive to the change of temperature. When the deformation temperature decreases or the strain rate increases, the flow stress-strain curve Rise. Through the relationship between flow stress, strain rate and deformation temperature, the stress exponent (n), stress parameter (α), structure factor (A), thermal deformation activation energy ) And its constitutive equation.