Effect of V content on microstructure and properties of laser cladding Fe-Cr alloy coatings
Iron-chromium alloy coatings with varying V content were fabricated using laser cladding.The microstructural and performance variations of the laser-cladded iron-chromium alloy coatings with different V contents were investigated using metallographic observation,SEM&EDS,and X-ray dif-fraction analysis.The results indicate that at lower V content,the iron-chromium alloy coating predom-inantly exhibits a dendritic growth mode.At the coating interface,the dendritic grew rapidly,Cr ele-ments do not have sufficient time to completely dissolve into the matrix,causing the matrix diffraction peaks to shift to higher angles.Increasing V content promotes the transition from dendritic to cellular growth,effectively improving the incomplete dissolution of Cr elements in the matrix and leading to a more uniform coating structure.The formation of VC promotes the transformation of γ-Fe to martensite during solidification,and the hardness of the coating increases.However,when the V content increases to 2%,the ferrovanadium content with a higher melting point increases,resulting in an increase in pore defects,which makes the wear resistance of the coating decrease.When the V content in the coating is 1%,the hardness and wear resistance are the best.
NETL
NSTL
万方数据
