Microstructure and Property of Novel γ-Fe/ (Cr, Fe)_7C_3 Lamellar Eutectics Reinforced Composite Coating

摘要

γ-Fe/(Cr, Fe)_7C_3 lamellar eutectics reinforced the composite coating was deposited onto the 16Mn steel surface to enhance its surface hardness and wear resistance. The microstructure, phase composition, microhardness as well as wear resistance of the cladding coating were explored. Results indicated that the coating showed the dense and defect-free metallurgical bonding with the substrate and mainly consisted of (Cr, Fe)_7C_3, γ-Fe/(Cr, Fe)_7C_3 lamellar eutectic, B4C and carbon fibers. (Cr, Fe)_7C_3, B4C and carbon fibers were tightly embedded in the γ-Fe/(Cr, Fe)_7C_3 lamellar eutectics matrix. The microhardness and wear resistance of the coating compared with that of the substrate were highly improved by nearly 5 and 3 times, respectively.