氧化物冶金与脉冲磁场参数影响钢组织的研究

Influence of oxide metallurgy and pulsed magnetic field parameters on steel microstructure

脉冲磁场处理与氧化物冶金技术是细化组织、提升材料性能的两种常用方法,将其有机结合可进一步优化钢铁材料的性能。利用自主研制的高频感应线圈加热炉与脉冲磁场发生装置将脉冲磁场非接触式地施加在钛处理低碳钢的凝固过程中,利用金相显微镜、多重分形软件与维氏硬度仪研究了不同脉冲磁场参数对凝固组织的影响。结果表明,脉冲磁场感应强度为135~190mT、磁场作用时间为5~10min时,试样的金相组织最细小均匀,原始奥氏体晶粒得到明显细化,原始奥氏体晶粒面积由15.79mm^2下降到1.25mm^2,试样的硬度值由118.1HV提升到165.4HV,此参数下的脉冲磁场对凝固组织的细化程度最佳。

Pulsed magnetic field treatment and oxide metallurgy technology are two common methods for refining microstructure and improving material properties,the organic combination can further optimize the performance of steel materials.A self-developed high-frequency induction coil heating furnace and a pulsed magnetic field generating device are used to non-contact apply apulsed magnetic field to the solidification process of titanium-treated mild steel.The metallographic microscope,multifractal software and Vickers hardness tester are used.The effect of different pulsed magnetic field parameters on the solidification structure is investigated.The results show that the pulsed magnetic field induction intensity is 135-190 mT,and the magnetic field action time is 5-10 min,the metallographic structure of the test is the smallest and uniform.The original austenite grains are remarkably refined,the area reduced from 15.79 to 1.25 mm^2,and the hardness of the test increased from 118.1 to 165.4 HV.The pulsed magnetic field under this parameter has the best refinement of the solidification structure.