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为了提高Fe-Cr-Ti-C系合金堆焊层的耐磨性能,在等离子弧堆焊该合金时引入纵向直流磁场,研究外加磁场对其堆焊层组织和性能的影响。利用X射线衍射仪、扫描电镜、光学显微镜、能谱分析仪、洛氏硬度计等设备进行检测。结果表明,堆焊层中形成了大量的TiC和M7C3陶瓷硬质相,堆焊层耐磨性能好;当磁场电流为4A时,堆焊层表面M7C3硬质相大部分呈六角状分布,堆焊层的硬度达68.8HRC,耐磨性能最佳。
In order to improve the wear resistance of the surfacing layer of Fe-Cr-Ti-C alloy, a longitudinal DC magnetic field was introduced into the alloy by plasma arc welding to study the effect of applied magnetic field on the microstructure and properties of the surfacing layer. Using X-ray diffraction, scanning electron microscopy, optical microscopy, energy spectrum analyzer, Rockwell hardness and other equipment for testing. The results show that a large amount of TiC and M7C3 ceramic hard phases are formed in the surfacing layer, and the wear resistance of the surfacing layer is good. When the magnetic field current is 4A, the hard phases of the surfacing M7C3 are mostly hexagonal, The hardness of the welding layer reaches 68.8HRC, the best wear resistance.