Microstructure and Wear Resistance of Strengthening Materials for Milling Tools

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.