Preparation of Aluminide Coating on 45 Steel by Vibration Assisted Infiltration and Its High-temperature Oxidation Resistance
MENG Kun1, ZHAN Zhaolin2, WANG Yuan1, WANG Wei1, YU Xiaohua3, RONG Ju4
1 Faculty of Mechanical and Manufacturing Engineering, Southwest Forestry University, Kunming 650224; 2 Faculty of Material Science and Engineering, Kunming University of Science and Technology, Kunming 650093; 3 National Engineering Research Center of Solid Waste Resource, Kunming University of Science and Technology, Kunming 650093; 4 Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016
Abstract: In order to reduce the aluminizing temperature to refine grain and improve the high-temperature oxidation resistance of 45 steel surface, nanostructured aluminide coating was prepared on the surface by vibration assisted infiltration. The phase composition of the coating was analyzed by X-ray diffractometer. The microstructure of the coating was observed by scanning electron microscopy and atomic force microscopy. The chemical composition of the coating was analyzed by energy dispersive spectrometer. The bond strength between coating and substrate was measured by scratch tester. The results show that the aluminide coating is mainly composed of η-Fe2Al5 and a small amount of θ-FeAl3 phases, and having single, dense and uniform characteristics. At 120 min, the surface of the aluminide coating formed by vibration assisted infiltration has two typical nanostructure regions of pits and hills, the longer the distance from the surface, the larger the nanocrystalline of the coating. When the load is perpendicular to 68 N, the noise signal appears, and the coating is damaged. The oxidation weight gain and spalling capacity of the coating in the oxidation resistance test are only 1/60 and 1/160 of the 45 steel sample treated with the less surface coating, that is, the aluminide coating remarkably enhances the ability of the 45 steel surface to resist high temperature oxidation.
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2018, Vol. 32 
