Preparation,microstructure and wear resistance properties of CoCrFeNiCu high-entropy alloy coating by laser cladding
CoCrFeNiCu high-entropy alloy coating was prepared by laser cladding on the surface of 45 steel with synchronous powder feeding method.The effects of laser power on the microstructure and wear resistance properties of CoCrFeNiCu high-entropy alloy coating were systematically investigated.The microstructure,phase composition and mechanical properties of the high entropy alloy coating were characterized and tested by X-ray diffractometer(XRD),optical microscope(OM),scanning electron microscope(SEM),energy dispersive spectrometer(EDS),Vickers hardness tester and multifunctional friction and wear testing machine.The results show that the coating is of only FCC phase under different laser power,indicating that the laser power does not change the phase composition of the coating.With the increase of laser power,the upper part of the coating changes from dendrites to cellular crystals,and the lower part changes from columnar crystals to cellular crystals and then to columnar crystals again.The crystal grains of the coating are uniform and dense at 1700 W of laser power.As the power increases,the grain size tends to grow as well.With the increase of laser power,the microhardness of the coating increases first and then decreases gradually,with the highest value being 202 HV0.2 at 1700 W of laser power.At 1700 W of laser power,the wear volume of the coating is only 0.03856 mm3,and the wear resistance reaches the best.
high entropy alloylaser claddingmicrostructurewear resistance
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