High-temperature flow behavior modeling of 2099 alloy considering strain effects  

考虑应变因素的2099合金高温流变行为模型（英文）

作　　者：张飞[1,2] 沈健[1] 闫晓东[1] 孙建林[3] 孙晓龙[1] 杨银[1] 刘勇 

机构地区：[1]北京有色金属研究总院,北京100088 [2]北京科技大学材料科学与工程学院,北京100083 [3]北京科技大学 材料科学与工程学院,北京100083 [4]南方航空动力机械集团有限公司,株洲412000

出　　处：《Transactions of Nonferrous Metals Society of China》2014年第3期798-805,共8页中国有色金属学报（英文版）

摘　　要：Isothermal compression tests in a wide range of temperatures （300-500 ℃） and strain rates （0.001-10 s^-1）, were performed on 2099 alloy to reveal the hot deformation characteristics. In order to give a precise prediction of flow behavior, the obtained experimental data were modified by friction and temperature correction and then employed to derive the constitutive modeling. The effects of the temperature and strain rate on hot deformation behavior can be expressed by Zener-Hollomon parameter including Arrhenius term. Furthermore, the influence of strain was incorporated in the constitutive analysis by considering the effect of strain on material constants （i.e. a, n, Q and A）. Consequently, the flow stress curves predicted by the developed modeling show a good agreement with the corrected ones, which indicates that the developed constitutive modeling could give an accurate and precise prediction for the flow stress of 2099 alloy.采用等温热压缩试验研究2099合金在变形温度300～500℃、应变速率0．001～10s-1条件下的热变形行为。为了准确地表征流变行为，采用摩擦与温度修正后的实验数据构建本构模型。结果表明，温度和应变速率对合金热变形行为的影响可用包含Arrhenius关系的z参数来表征。此外，通过计算不同应变量下的材料常数（a、n、Q和A）考虑了应变对本构模型的影响。利用统计分析对比了由本构模型获得的预测曲线与试验修正曲线，二者显示了很好的吻合，这表明所构建的本构模型能够很好地预测2099合金的热变形流变行为。

关 键 词：2099 alloy constitutive modeling compensation of strain flow stress 

分 类 号：TG131[一般工业技术—材料科学与工程]