在镍基堆焊合金等离子弧堆焊过程中引入横向交流脉冲磁场,研究了横向交流脉冲磁场频率对等离子弧堆焊层金属组织及性能的影响,并利用光学金相、x射线衍射、显微硬度和湿砂橡胶轮磨损试验等方法,系统分析了不同脉冲磁场频率作用下堆焊试样的硬度、耐磨性及组织.结果表明,外加横向交流脉冲磁场可以有效改善堆焊层金属的结晶形态,细化晶粒,在适当的脉冲磁场频率作用下,可以获得最佳的电磁搅拌效果,增加堆焊层金属中硬质相的数量,控制硬质相的生长方向,提高等离子弧堆焊层的硬度和耐磨性.%The nickel-base alloy was deposited on the low carbon steel by plasma arc surfacing with transverse magnetic field. The influence of transverse alternative pulsed magnetic field frequency on microstrueture and properties of plasma arc surfacing layer was researched. The hardness, wear resistance and micmstructure of surfacing layer at different pulsed magnetic field currents were systematically analyzed by optical electronic microscope, wear test and microscopic hardness test. The results indicated that the transverse alternative pulsed magnetic field can effectively improve the crystal shape in plasma arc surfacing layer and refine crystal grain. With the proper pulsed magnetic field frequency, the optimum effete of electromagnetic stirring can be obtained, the amount of hardening phase in overlay deposit is increased, the growth direction of hardening phase can be controlled and the hardness and wear resistance of the surfacing overlay are improved.
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