永磁驱动的行波磁场理论及对凝固组织微细化作用

Theory of Travelling Magnetic Field Excited by Permanent Magnetand Its Refine Function on Metal Solidification Structure

摘要:

开发了一套以强磁性永磁体为驱动介质的行波磁场发生器，该装置具有使金属凝固组织微细化的作用。研究了永磁驱动的行波磁场理论；建立了数学模型，导出了金属液内与铸坯方向平行磁力分量的解析解，通过圆坯和扁坯的实验验证了磁力的存在。在金属凝固过程中，施加适当的永磁驱动行波磁场可得到100％的等轴晶组织。

Abstract:

An experimental set up of travelling magnetic field excited by supper power permanent magnet was designed, which has obviously refine function for metal solidification structure. Theory of travelling magnetic field excited by permanent magnet was researched: mathematics model was built, analysis solutions of magnetic component force parallel to slab was obtained. It was confirmed that the magnetic component force was existed through round and slab of cast metal experiment. When travelling magnetic field was imposed properly during metal solidification, solidification structure of 100% fine equiaxed crystal could be obtained.