Microstructure and wear behavior of laser cladding FeCoCrNiMnNb high entropy alloy coating
In order to study the influence of Nb elements on the organization and properties of FeCoCrNiMn high-entropy alloy,FeCoCrNiMnNb high-entropy alloy coatings were prepared on the surface of Q235 steel by using laser cladding technology,and the phase compositions,microstructures,elemental distributions,nano-hardnesses and wear behaviors of the coatings were investigated,respectively.The results show that the FeCoCrNiMnNb high-entropy alloy coating consists of FCC phase and Laves phase.Among them,the matrix phase is the FCC phase and the bar organization is the Laves phase.Due to the solid solution strengthening and the second precipitation strengthening effect,the nanohardness of the FeCoCrNiMnNb high-entropy alloy coating is significantly enhanced to about 9.193 GPa,which is about twice of that of the FeCoCrNiMn coat-ing.Due to the significant enhancement of the nanohardness,the FeCoCrNiMnNb coating has excellent wear resistance,with a wear rate of 2.549× 10-5 mm3/N·m,which is about 0.33 times that of the FeCoCrNiMn coat-ing.The wear mechanism of the FeCoCrNiMnNb coating is a single abrasive wear.In summary,the FeCoCrNiMnNb high-entropy alloy coating has very high nanohardness and excellent wear resistance.
laser claddingFeCoCrNiMnNb high entropy alloy coatingwear resistanceNbnano-hardness
NETL
NSTL
万方数据
