为了利用磁场的作用提高堆焊层的性能,研究了磁场对铁基碳弧堆焊层组织和性能的影响,在对Cr-B-Ni-V系铁基合金进行碳弧堆焊时加入直流横向磁场,以求细化堆焊层金属的组织,控制硬质相的形态及分布.通过对堆焊层进行硬度试验、磨损试验、金相试验,得出了堆焊电流和磁场电流对堆焊层金属的硬度和耐磨性的影响规律.结果表明:施加磁场的堆焊层比未施加磁场的堆焊层硬度高,耐磨性好;堆焊电流与磁场电流相匹配(堆焊电流180A,磁场电流3A)时,堆焊层的性能达到最佳,即硬度最高,耐磨性最好,此时堆焊层中硬质相细小且分布均匀,呈"六角形",方向一致.
In order to improve the properties of surfacing layers, study the influence of magnetic field on micro-structure and properties of carbon arc surfacing layer, a DC transverse magnetic field was applied to the carbon arc surfa-cing of Cr-B-Ni-V iron based alloy system. An attempt to refine the structure of surfacing layer metal and control the mor-phology and distribution of hard phase in surfacing layer was made. The influence of surfacing current and magnetic field current on degree of hardness and wear resistance was obtained through hardness test, wear test and microscopic test. The results show that the surfacing layer of introducing magnetic field has higher hardness and better wear resistance than the surfacing layer without magnetic field; The properties of surfacing layer are optimal when surfacing current and mag-netic field current match each other. That is, the hardness and wear resistance of surfacing layer are optimal when surfa-cing current is 180 A and magnetic field current is 3A. At this point, the hard phase in the surfacing layer is fine and e-ven, hexagonal in shape, the orientation of which is consistent.
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