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在等离子弧堆焊铁基复合耐磨合金过程中引入外加纵向直流磁场,在堆焊层中合成陶瓷硬质相,研究磁场电流大小对母材的稀释作用的影响。利用光学显微镜、扫描电镜、能谱分析仪、显微硬度计等试验设备进行检测分析。结果表明,外加磁场可以增加母材与堆焊层之间的过渡层的厚度,提高堆焊层与母材的结合强度,从而提高了材料的整体耐磨性能;随着磁场电流的增加,母材的稀释作用增强,磁场电流为4A时,过渡层的厚度适中,保证了堆焊层与母材的结合强度的同时没有影响堆焊层中硬质相的形成;磁场电流5A以上时,由于强烈的电磁搅拌作用,母材对堆焊合金的稀释作用过大,阻碍了堆焊层中陶瓷硬质相的形成,不利于提高耐磨性。
In the process of plasma arc welding of iron-based composite wear-resistant alloy, an applied longitudinal DC magnetic field was introduced to synthesize ceramic hard phases in the overlay layer to study the influence of the magnetic field current on the dilution effect of the base metal. The use of optical microscopy, scanning electron microscopy, energy spectrum analyzer, microhardness test equipment such as testing analysis. The results show that the applied magnetic field can increase the thickness of the transition layer between the base metal and the surfacing layer and improve the bonding strength between the surfacing layer and the parent material, so as to improve the overall wear resistance of the material. With the increase of the magnetic field current, The dilution effect of the material is enhanced. When the magnetic field current is 4A, the thickness of the transition layer is moderate, which ensures the bonding strength of the overlay layer and the base metal without affecting the hard phase formation in the overlay layer. When the magnetic field current is more than 5A, Strong electromagnetic stirring, base metal dilution of the overlay alloy is too large, hindering the formation of ceramic hard phase in the overlay layer is not conducive to improving the wear resistance.