Research on the Ni-Cr Alloy Coatings on the Hydraulic Prop by High-Frequency Induction Cladding
Ni-based cladding coatings are prepared on the surface of hydraulic prop mobile column by high-frequency induction cladding with different current. Microstructures of coatings are analyzed by metallographic microscope as well as SEM, while coatings and matrix elements are analyzed by EDS. The results show that metallurgical bonding is formed among transition regions of matrix and coatings with obvious white band, when cladding frequency is 250KHz and current is 1160A. The microstructures of coatings are eutectics of austenite + carbide, relatively uniform. During the process of cladding, Fe as well as Mn in matrix permeats to coatings; while Si element in coatings permeats to matrix. As a result, the Fe content of trasition regions is raised, and the contents of Ni and Cr is comparatively reduced.