【摘要】 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/LH₂SO₄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。更多还原

【Abstract】 Surface alloys with various compositions of Co,Cr,and W on 20Cr-Mosteel have been processed by controlling the ratio of thickness of plasma spray-ed Co-Cr-W coating to laser melting depth.A formula has been suggested toevaluate the contents of surface alloying elements.With the contents of Co,Cr,and W increasing in the surface alloy system,two hardness peaks occurat about 17Co7Cr3W and 52Co22Cr9W corresponding to microstructure of Mand γ-Co+M₂₃C₆ respectivety.Wear experiments in media of air,0.5mol/LH₂SO₄ and 1% NaCl indicate that 17Co7Cr3W surface alloy has higher wearresistance in air,while 52Co22Cr9W a better one in the corrosive media underhigher load.In any case,wear resistance of the above two surface alloys ismuch better than that of plasma sprayed coating of Co-Cr-W.更多还原