W-75%Cu复合材料的高温变形行为及加工图

Hot Deformation Behavior and Processing Maps of W-75%Cu Composite

摘要:

利用Gleeble-1500D热模拟试验机，在温度650~950 ℃、应变速率0.01~5 s-1、总应变量0.7的条件下，对W-75%Cu复合材料高温塑性变形行为及其热加工图进行研究和分析。结果表明：W-75%Cu复合材料高温流动应力-应变曲线主要以动态再结晶为特征，峰值应力随变形温度的降低或应变速率的升高而增加；在真应力-应变曲线基础上，建立的W-75%Cu复合材料高温变形本构模型较好地表征了其高温流变特性；同时，利用W-75%Cu复合材料DMM加工图分析其变形机制和失稳机制，可确定其热加工工艺参数应优先选择变形温度800~950 ℃、应变速率0.01~0.1 s-1

Abstract:

Using the Gleeble-1500D simulator, the high-temperature plastic deformation behavior and processing map of W-75%Cu composite were investigated at 650~950 ℃ with the strain rate of 0.01~5 s-1 and total strain of 0.7. The results show that the softening mechanism of dynamic recrystallization is a feature of high-temperature flow stress-strain curves of W-75%Cu composite, and the peak stress increases with the decrease of deformation temperature or the increase of strain rate. Based on the true stress-strain curves, the established constitutive equation represents the high-temperature flow behavior of W-75%Cu composite, and the calculated results of the flow stress are in good agreement with the experimental results of the high-temperature deformation of W-75%Cu composite. Meanwhile, the obtained processing map of Dynamic Material Modeling is used to analyze the deformation mechanism and the destabilization mechanism of W-75%Cu composite, the optimal deformation processing parameters of the deformation temperatures range and the strain rates range are 800~950 ℃ and 0.01~0.1 s-1, respectively