Abstract
In this study, Fe matrix reinforced with column-shaped WC-Fe composite was designed and fabricated by a novel in situ method. The WC-Fe/Fe composite exhibited a similar structure to that of reinforced concrete. The microstructure, microhardness, impact toughness, and wear resistance of the composites were characterized using scanning electron microscopy, and x-ray diffraction, as well as microhardness, impact, and wear tests. Small amounts of graphite (G), α-Fe, and WC were the predominant phases in the reinforcing bar of the composites. WC particulates improved the wear resistance of the composite, and the highest wear resistance was 96 times higher than that of gray cast iron under a load of 20 N with SiC abrasive particles. The wear resistance mechanism involved protection of the matrix behind the WC bundles by hard carbides. The excellent fracture toughness of the composite was mainly attributed to the disappearance of G flakes from the Fe matrix because of the in situ reaction, which reduced the split action to the matrix. The matrix absorbed a large amount of the crack propagation energy.
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The project was supported by the National High Technology Research and Development Program of China (No. 2013AA031803) and the International S & T Cooperation Program of China (No. 2014DFR50630). The authors also acknowledge the financial support from the National Natural Science Foundation (No. 51374169), the Doctoral Scientific Research Foundation of Xi’an University of Technology (No. 101-451115013), and the Project of the Shaanxi Key Laboratory of Nano Materials and Technology (14JS046, 14JS048 and 13JS054).
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Zhong, L., Yan, Y., Ovcharenko, V.E. et al. Microstructural and Mechanical Properties of In Situ WC-Fe/Fe Composites. J. of Materi Eng and Perform 24, 4561–4568 (2015). https://doi.org/10.1007/s11665-015-1742-4
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DOI: https://doi.org/10.1007/s11665-015-1742-4