温度场对电磁搅拌镁合金组织和性能的影响  

Effect of Temperature Field on Microstructure and Properties of Electromagnetic Stirring Magnesium Alloy

作　　者：战春 于宝义[1] 郑黎[1] 于博宁 ZHAN Chun;YU Bao-yi;ZHENG Li;YU Bo-ning(School of Materials Science and Engineering, Shenyang University of Technology, Shenyang 110870,Liaoning, China)

机构地区：[1]沈阳工业大学材料科学与工程学院

出　　处：《铸造》2019年第7期711-717,共7页Foundry

基　　金：辽宁省自然科学基金(20170540683)

摘　　要：采用数值模拟结合试验的方式探究旋转磁场条件下温度场对AZ31镁合金组织性能的影响。在旋转磁场作用下,液态AZ31镁合金随着温度的降低流动速度先增加后减小,且越靠近边缘流速越小。由于凝固时温度变化,管坯晶粒在沿径向上有边缘粗大中间细小的分布规律,力学性能也随之有着边缘低中间高的体现。空气冷却与水冷却性能对比表明,水冷却有助于晶粒细化和控制第二相分布,使力学性能得以提升。In this present work, the effect of temperature field on the microstructure and properties of AZ31 magnesium alloys under rotating magnetic field was investigated by means of numerical simulation and experiment. Under the action of rotating magnetic field, the flow velocity of liquid magnesium alloy first increased and then decreased with the decrease of temperature, and the closer to the edge, the smaller the flow velocity becomes. Due to the change of temperature during solidification, the grain size of the billet had the distribution rule of coarse in the edge and fine in the middle along the radial direction, and the mechanical properties of the billet also was low in the edge and high in the middle. The comparison between air cooling and water cooling showed that water cooling was helpful to refine grains and control the distribution of the second phase.

关 键 词：电磁搅拌 凝固流场 冷却温度场 晶粒细化 镁合金 

分 类 号：TG456[金属学及工艺—焊接]