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在20CrMo 钢表面等离子喷涂不同厚度的 Co-Cr-W 涂层,经激光重熔后,获得不同的表面合金成分。建立了计算表面合金化元素含量表达式。在17Co7Cr3W 与52Co22Cr9W 成分和相应的马氏体及γ-Co+M23C6组织状态下,发现随合金化元素 Co,Cr,W 含量增加,有两个硬度峰值。耐磨试验表明,表面合金17Co7Cr3W 在空气中具有较高的耐磨性,而表面合金52Co22Cr9W 在0.5mol/LH_2SO_4和1%NaCl 腐蚀介质中,高载荷时耐磨性显著改善。与等离子喷涂表面相比,两个合金化成分都显示出良好的耐磨性。
The surface of 20CrMo steel was plasma sprayed with Co-Cr-W coatings of different thicknesses. After laser remelting, different surface alloy compositions were obtained. The formula for calculating the content of alloying elements in the surface is established. In the 17Co7Cr3W and 52Co22Cr9W compositions and the corresponding martensite and γ-Co + M23C6 microstructures, it was found that with the addition of alloying elements, Co, Cr and W, there are two hardness peaks. Wear test showed that the surface alloy 17Co7Cr3W has high wear resistance in the air, while the surface alloy 52Co22Cr9W in 0.5mol / LH_2SO_4 and 1% NaCl corrosion medium, wear resistance significantly improved at high load. Both alloying components show good wear resistance compared to the plasma sprayed surface.