采用四元二次回归旋转正交设计方法设计了反应等离子熔覆试验方案,采用此方案在Q235钢表面原位合成了 WC增强铁基合金涂层,得到了优化工艺并研究了优化工艺制备涂层的组织和性能.结果表明：该涂层的优化工艺参数为碳钨原子比为1．4,钨质量分数为20％,熔覆电流130 A,熔覆速度100 mm.min－1；优化工艺制备的涂层与基体呈良好冶金结合,其显微组织主要由平面晶、胞状晶、树枝晶、等轴晶组成,物相主要为α-Fe、M23 C6和 WC；涂层的截面硬度最高为1120 HV,表面平均硬度为68 HRC.
The plasma cladding schemes were designed by the four-factor quadric orthogonal rotating regression design method.Based on these schemes, the WC reinforced Fe-based alloy coating were in-situ synthesized on the surface of Q235 steel and the optimum process was obtained.The microstructure and properties of the coating prepared under the optimum process were also studied.The results show that the optimum process parameters of the coating were listed as follows:C/W atomic ratio of 1.4,tungsten content of 20wt%,cladding current of 130 A and cladding rate of 100 mm.min-1 .The coating prepared with the optimum process showed a good metallurgical bonding with the substrate;the microstructure of the coating mainly consisted of planar crystal, cellular crystal,dendrite crystal and equiaxed crystal and the phase composition was composed ofα-Fe,M23 C6 and WC;the sectional hardness of the coating was up to 1 120 HV and the surface average hardness was 68 HRC.
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