为了研究再制造功能涂层切屑成形特点,以FeAlCrBSiNb 涂层为研究对象,采用 FEM 和切削试验相结合的方法,系统地分析了涂层切屑的结构特点和成形机理。分析结果表明,FeAlCrBSiNb 涂层切屑属于周期性锯齿形挤裂切屑,并且涂层的非均质颗粒和孔隙促使切屑局部区域产生微裂纹；切屑成形过程主要包括裂纹萌生、裂纹扩展和裂纹终止3个阶段,整个过程主要受到剪切应力、挤压应力和摩擦粘结阻力的综合作用；切屑锯齿形裂纹发生在切屑受力发生交变的终止滑移线区,相邻裂纹的成形过程影响较小。
To study the mechanics of chip formation on the functional coating for remanufacturing,the chip morphology and forming characteristic of the FeAlCrBSiNb coating was researched by the FEM and experi-ment.The results show that the coating chip was periodic serrated extrusion chip,and the microcrack of the coating was also generated by the heterogeneous particle and aperture gap;moreover,there are crack emerging, extending and finish phases in the coating chip formation,and the process was mainly affected by the shearing stress,extrusion stress and friction-bonding resistance of chip and tool.In addition,the serrated crack was lo-cated in the zone of the termination of slip line,and there was small effect between the different cracks forma-tion.
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