BFe10-1.6-1白铜合金高温变形行为及修正非线性回归本构模型  

High-temperature deformation behavior and modified nonlinear regression constitutive model of BFe10-1.6-1 cupronickel alloy

作　　者：郭敏 蔡军[1,2] 丁奔 陈琳 GUO Min;CAI Jun;DING Ben;CHEN Lin(School of Metallurgy Engineering,Xi′an University of Architecture&Technology,Xi′an 710055,China;National and Local Joint Engineering Research Center for Functional Materials Processing,Xi′an 710055,China)

机构地区：[1]西安建筑科技大学冶金工程学院,陕西西安710055 [2]功能材料加工国家地方联合工程研究中心,陕西西安710055

出　　处：《塑性工程学报》2022年第6期141-148,共8页Journal of Plasticity Engineering

基　　金：国家自然科学基金重点项目(52034005);陕西省重点研发计划(2020ZDLGY13-06,2020ZDLGY12-10);陕西省教育厅产业化项目(21JC020)。

摘　　要：利用热压缩实验研究了BFe10-1.6-1白铜合金在变形温度为1073~1273 K和应变速率为0.001~10 s^(-1)条件下的热变形行为。根据热压缩实验的真应力-真应变数据,建立了该合金的修正非线性回归本构模型。结果表明,BFe10-1.6-1白铜合金在高温热压缩过程中具有明显的动态软化特征,随着变形温度的升高和应变速率的降低,流变应力减小。合金的应变速率敏感指数m为0.096,热变形激活能Q为430.1 kJ·mol^(-1),因此BFe10-1.6-1白铜合金为应变速率和变形温度敏感型材料。引入相关系数R和平均相对误差e对所建立的本构方程进行验证,结果表明,修正非线性回归模型对BFe10-1.6-1白铜合金热变形流变应力具有较高的预测精度和可靠性。The thermal deformation behavior of BFe10-1.6-1 cupronickel alloy at deformation temperature of 1073-1273 K and strain rate of 0.001-10 s^(-1) was studied by thermal compression experiments.According to the true stress-true strain data of thermal compression experiments,the modified nonlinear regression constitutive model of this alloy was established.The results show that BFe10-1.6-1 cupronickel alloy has obvious dynamic softening characteristics during thermal compression at high temperature.The rheological stress decreases with the increase of deformation temperature and the decrease of strain rate.The strain rate sensitive index m of the alloy is 0.096,and the thermal deformation activation energy Q is 430.1 kJ·mol^(-1).Therefore,BFe10-1.6-1 cupronickel alloy is a material which is sensitive to strain rate and deformation temperature.The correlation coefficient R and the mean relative error e were introduced to verify the established constitutive equation.The results show that the prediction accuracy and reliability of the modified nonlinear regression model for predicting the thermal deformation rheological stress of BFe10-1.6-1 cupronickel alloy are high.

关 键 词：BFe10-1.6-1白铜合金 高温变形行为 流变应力 本构方程 

分 类 号：TG301[金属学及工艺—金属压力加工]