Effect of Liquid Phase Rapid Cooling and Solid Phase Rapid Cooling on Microstructure and Physical&Mechanical Properties of Cemented Carbide
The WC-13%Co cemented carbide was treated by liquid phase rapid cooling(1350℃ and above)and solid phase quenching rapid cooling technology(1100℃ and below)at high temperatures.The effects of two treatment methods on the microstructure and physical&mechanical properties of the cemented carbide were studied.The results show that compared with the sintered state,the microstructure of the cemented carbide after rapid cooling treatment has no obvious change,while the grain size after liquid phase rapid cooling treatment and solid phase rapid cooling treatment increases by 28.13%and 18.75%,respectively.In terms of physical&mechanical properties,the rapid cooling treatment has a certain change compared with the sintered state.Compared with the solid phase rapid cooling treatment,the physical&mechanical properties of the liquid phase rapid cooling treatment change significantly.Compared with the sintered state,the cobalt magnetic and coercive magnetic forces decrease by 4.5%and 1.0 kA/m,respectively.The vickers hardness,crack length and solid solubility of W in the cobalt phase increase by 0.98 GPa,33.3µm and 6%,respectively.The main reason for the significant change is that the solid solubility of W in the binder phase Co increases significantly after the liquid phase rapid cooling treatment,which has a significant strengthening effect on the cemented carbide.
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