考虑不同应变的3003铝合金流变应力预测模型建立与验证  

Establishment and verification of flow stress pridiction model considering different strains of 3003 aluminum alloy

作　　者：陈贵清[1] 傅高升[2] 王军德[3] 程超增[2] CHEN Gui-qing;FU Gao-sheng;WANG Jun-de;CHENG Chao-zeng(Department of Mechanical Engineering, Fujian Chuanzheng Communications College, Fuzhou 350007, China;College of Materials Science and Engineering, Fuzhou University, Fuzhou 350108, China;Department of Mechanical Engineering, Changji Vocational and Technical College, Changji 831100, China)

机构地区：[1]福建船政交通职业学院机械工程系,福建福州350007 [2]福州大学材料科学与工程学院,福建福州350108 [3]新疆昌吉职业技术学院机械工程分院,新疆昌吉831100

出　　处：《塑性工程学报》2018年第2期265-271,共7页Journal of Plasticity Engineering

基　　金：福建省自然科学基金资助项目(2017J01156;2017J01083);新疆维吾尔自治区高校科研计划科学研究重点资助项目(XJEDU2016I068);福建省教育厅A类科技项目(JA15659);福建省交通科技项目(200944);福建船政交通职业学院校级科技服务团队建设资助项目(闽交院科[2016]2号)

摘　　要：在应变速率0．01-10．0s。以及热变形温度300-500℃下，通过Gleeble-1500热模拟试验机对3003铝合金进行高温等温压缩实验。结果表明，该合金具有正的应变速率敏感性。当变形温度低于350℃时，合金的热变形机制以动态回复为主；应变速率大于1．0s^-1时，合金的热变形机制以不连续动态再结晶为主。建立了综合考虑应变速率、变形温度以及应变对流变应力影响的本构方程，本构方程中的材料常数可以表示为应变的4次多项式函数。模拟结果表明：预测曲线与实验曲线吻合较好，流变应力的实测值与预测值的均方根误差以及平均相对误差分别为0．99814和5．72％。所建立的本构方程计算精度较高，可以为合金热变形流变应力的预测提供参考依据。High temperature isothermal compression experiment of 3003 aluminum alloy was deformed at deformation temperature of 300 -500 ℃, strain rate of 0. 01 - 10. 0 s^-1 with Gleeble-1500 thermal simulator. The results show that the 3003 aluminum alloy has the positive strain rate sensitivity. When the deformation temperature is lower than 350 ℃, the thermal deformation mechanism of the alloy is mainly dynamic recovery. When the strain rate exceeds 1.0 s^-1, the thermal deformation mechanism of the alloy is mainly discontinuous dynamic recrystallization. A constitutive equation considering the effect of strain rate, strain and hot deformation temperature on the flow stress was established, and material constants of the constitutive equation could be described as four polynomial function of strain. The simulation results show that the forecasting curves match well with the experimental curves. The root mean square error between the pre- dicted flow stress values and measured flow stress values is 0. 99814 and average relative error is 5.72%. The calculation accuracy of the established constitutive equation is good, which provides reference for the thermal deformation flow stress prediction of alloy.

关 键 词：3003铝合金 本构方程 应变 材料常数 

分 类 号：TG146.4[一般工业技术—材料科学与工程]