The Effects of WC on the Microstructures and Wear Resistance of FeCoCrNiB_0.2 High Entropy Alloy

【摘要】 To improve the wear resistance of the FeCoCrNiB_0.2 high entropy alloy （HEA）,the FeCoCrNiB_0.2 （WC₀） and FeCoCrNiB_0.2+20wt%WC (WC₂₀) HEA coatings were prepared on Q235 steel by laser cladding （LC）.The microstructure,hardness,and tribometer of the HEA coatings were investigated using scanning electron microscopy with spectroscopy （SEM/EDS）,X-ray diffraction （XRD）,vickers microhardness tester,and pin-on-disc tribometer,respectively.The experimental results show that the WC₀ HEA coating comprises a simple BCC phase mixed with an M₂B phase.Adding 20wt%WC,the WC₂₀ HEA coating is composed of a simple BCC phase mixed with the Cr₂₃C₆ carbide phase.The microstructure of the WC₂₀ HEA coating is simple,which consists of equiaxed grain and dendritic.The microhardness also increases from 625.5HV to 806.0HV,and the wear mass loss correspondingly decreases from 30.9 to 14.9 mg.W and C atoms formed by WC dissolution are mainly dissolved in the BCC phase,which leads to the solution strengthening effect.Besides,Cr₂₃C₆ carbides inhibit the growth of the grains,play the role of fine-grain strengthening,and further improve the hardness and wear resistance of the HEA coating.更多还原

【Abstract】 To improve the wear resistance of the FeCoCrNiB_0.2 high entropy alloy （HEA）,the FeCoCrNiB_0.2 （WC₀） and FeCoCrNiB_0.2+20wt%WC (WC₂₀) HEA coatings were prepared on Q235 steel by laser cladding （LC）.The microstructure,hardness,and tribometer of the HEA coatings were investigated using scanning electron microscopy with spectroscopy （SEM/EDS）,X-ray diffraction （XRD）,vickers microhardness tester,and pin-on-disc tribometer,respectively.The experimental results show that the WC₀ HEA coating comprises a simple BCC phase mixed with an M₂B phase.Adding 20wt%WC,the WC₂₀ HEA coating is composed of a simple BCC phase mixed with the Cr₂₃C₆ carbide phase.The microstructure of the WC₂₀ HEA coating is simple,which consists of equiaxed grain and dendritic.The microhardness also increases from 625.5HV to 806.0HV,and the wear mass loss correspondingly decreases from 30.9 to 14.9 mg.W and C atoms formed by WC dissolution are mainly dissolved in the BCC phase,which leads to the solution strengthening effect.Besides,Cr₂₃C₆ carbides inhibit the growth of the grains,play the role of fine-grain strengthening,and further improve the hardness and wear resistance of the HEA coating.更多还原