关键词：钢铁;高速氧燃料;显微硬度;显微组织
摘 要：The oxidation behavior of HVOF sprayed Cr_3C_2-NiCr coatings on 310S stainless steel for 50 cycles in air at 700℃ under cyclic conditions has been investigated in the present work. The microstructure, hardness and porosity of the coating were characterised. X-ray diffraction, field emission scanning electron microscope with energy dispersive spectroscopy and X-ray mapping were used to analyze the scales formed on the surface of the oxidised samples. The microstructure of the as sprayed coating showed uniformly distributed chrome carbide-rich ceramic grains attached with nickel chrome-rich binder phase. The Cr_3C_2-25NiCr coated specimen exihibit negligible microspalling of the scales upon oxidation. The improved oxidation resistance of Cr_3C_2-NiCr coatings may be attributed to the formation of oxides of chromium, nickel, and spinels of nickel and chromium.