套磨铣工具强化材料的组织与耐磨性能

Microstructure and Wear Resistance of Strengthening Materials for Milling Tools

采用WC -TiC -TaC -Co金属陶瓷与CuZnNi合金 ,研制出一种具有高耐磨性和良好抗冲击性能的复合耐磨堆焊材料。运用SEM、TEM、摩擦磨损试验及实际工程应用对堆焊材料的组织性能进行了分析。研究结果表明 ,堆焊层基体由α和 β相组成 ,金属陶瓷在基体中均匀分布。金属陶瓷与Cu基合金通过扩散机制形成界面 ,界面上存在高密度位错与层错。堆焊层耐磨性随着金属陶瓷含量的增加而增加 ,当金属陶瓷含量为6 0 %～ 6 5 %时 ,堆焊层具有最佳的耐磨性。基体的磨损表现为显微切削与犁沟 ,金属陶瓷的磨损主要是界面处碳化物的脆断与脱落。实际工程应用证明研究的耐磨堆焊材料能显著提高套磨铣工具使用寿命 ,具有显著的经济效益和社会效益。

A new strengthening material for the milling tools with a high wear resistance and good impact toughness properties is developed.The composite hardfacing materials mainly contained WC TiC TaC Co ceramet and CuZnNi matrix alloy.The microstructure and properties were studied by means of SEM,TEM,wear test and industrial practice.The results show that the microstructure of matrix metal is mainly composed by the phase of α and β.The particles of the ceramet uniformly distribute in the matix metal.The interface of the ceramet and matrix metal is formed by element diffusion.There are high tensity dislocation and stacking fault on the interface.The wear resistance of hardfacing layer increase with an increase of the content of the ceramet.The best wear resistance is obtained at a content of ceramet 60～65%.The wear mechanisms of the composite materials include ploughing of matrix metal and spalling of the ceramet.The industrial practice has proved that the composite hardfacing materials can effectively raise the service life of milling tools and have high economical profit.