挤压轮转速对连续挤压铝锶合金成形及组织性能的影响  

Effects of wheel angular velocity on forming,microstructure and mechanical properties of Al-Sr alloy during continuous extrusion

作　　者：毕胜[1] 运新兵[1] 裴久杨[1] 闫志勇 张旭 

机构地区：[1]大连交通大学连续挤压教育部研究中心,大连116028 [2]大连康丰科技有限公司,大连116050

出　　处：《塑性工程学报》2016年第5期23-28,共6页Journal of Plasticity Engineering

基　　金：辽宁省高等学校优秀人才支持计划资助项目(LR2015011)

摘　　要：采用数值模拟与工艺实验相结合,研究了挤压轮转速对铝锶合金连续挤压成形过程和产品组织性能的影响。通过数值模拟分析了不同转速下坯料的温度、速度和等效应变分布情况以及模具的温度分布规律并利用金相观察和拉伸试验分析了不同转速下实际连续挤压产品的组织性能。结果表明,铝锶合金在连续挤压过程中,坯料进入腔体后,温度开始升高,最高温度和最大速度出现在模具出口处;最大等效应变出现在直角弯曲处。当挤压轮转速由4r·min^(-1)增加到7r·min^(-1)时,腔体内的坯料最高温度由460℃升高到514℃,模具出口处的温度由490℃升高到527℃;产品中Al4Sr相形态由块状变成颗粒状,尺寸减小;抗拉强度由98.7MPa上升到106.9MPa,伸长率变化不大,维持在约11%。Effects of wheel angular velocity on forming,microstructure and mechanical properties of Al-Sr alloy during continuous extrusion were investigated by using finite element（FE）simulation and experiments.The temperature distributions of the die and the temperature,velocity and effective strain distributions of the billet at different extrusion wheel angular velocities were numerically analyzed and the microstructure and mechanical properties of actual continuous extrusion products at different extrusion wheel angular velocities were analyzed by using metallographic observation and tensile test.The results show that the temperature of the billet begins to increase after the billet enters into the cavity during the process.The highest temperature and velocity occur at the die exit and the maximum effective strain occurs at the rectangular bending area.When the wheel angular velocity increases from 4r·min-1 to 7r·min-1,the highest temperature of the billet in the cavity and the die exit increases from 460℃to 514℃and from 490℃to 527℃,respectively;the size of Al4Sr phase reduces and the morphology of Al4Sr phase in the products changes from blocky shape to particulate shape;the tensile strength rises from 98.7MPa to 106.9MPa and the elongation changes slightly,maintaining at about 11%.

关 键 词：连续挤压 铝锶合金 挤压轮转速 Al4Sr相 

分 类 号：TG146.2[一般工业技术—材料科学与工程]