Effect of laser power on microstructure and properties of FeCoCrNiMn high entropy alloy cladding coating
FeCoCrNiMn high entropy alloy coatings were prepared on the surface of 40CrMnMo steel by laser cladding with five different laser powers.Microstructure,phase,mechanical properties and corrosion resistance of the coatings were studied by means of X-ray diffraction(XRD),scanning electron microscopy(SEM),energy dispersive spectroscopy(EDS)analysis,Vickers microhardness tester,stress analyzer,friction and wear testing machine and electrochemical workstation.The effect of laser power on the microstructure and properties of the cladding coatings was analyzed.The results show that the microstructure of the FeCoCrNiMn coatings prepared by laser cladding is mainly FCC solid solution phase.When the laser power is greater than 1400 W,the coatings exhibit BCC phase(α-Fe)structure,with dendritic structure and martensite within the crystal.As the laser power increases,the residual stress in the coatings first decreases and then increases,reaching a minimum value of 215.3 MPa at 1000 W,and the hardness of the coatings first increases and then decreases,reaching a maximum value of 215.4 HV0.3 at 1000 W.When the laser power is 1000 W,the wear resistance of the coating is the best and the wear rate is the lowest,which is 1.406×10-5 g·N-1·m-1.When the laser power is 1200 W,the coating has the best corrosion resistance,with the highest self corrosion potential of-0.24 V and the lowest self corrosion current density of 2.37x10-9 A·cm-2.Based on comprehensive analysis of the experimental results,the optimal laser power for preparing FeCoCrNiMn high entropy alloy coatings by laser cladding is 1000 W.At this time,the surface forming quality of the cladding coating is good,with the best wear resistance and good corrosion resistance.
laser claddingFeCoCrNiMn high entropy alloyfrictional propertyelectrochemical performance
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