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首页> 外文期刊>Journal of Materials Engineering and Performance >Microstructural and Mechanical Properties of In Situ WC-Fe/Fe Composites
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Microstructural and Mechanical Properties of In Situ WC-Fe/Fe Composites

机译：原位WC-Fe / Fe复合材料的组织和力学性能

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摘要

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), alpha-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.
机译：本研究采用新颖的原位方法设计并制备了圆柱状WC-Fe复合材料增强的Fe基体。 WC-Fe / Fe复合材料表现出与钢筋混凝土相似的结构。使用扫描电子显微镜和X射线衍射以及显微硬度，冲击和磨损测试来表征复合材料的显微组织，显微硬度，冲击韧性和耐磨性。少量的石墨（G），α-Fe和WC是复合材料钢筋中的主要相。 WC颗粒改善了复合材料的耐磨性，在20 N的SiC磨料负载下，其最高耐磨性是灰铸铁的96倍。耐磨机制涉及通过硬质碳化物保护WC束后的基体。复合材料优异的断裂韧性主要归因于原位反应，从Fe基体中消失了G片，从而降低了基体的分裂作用。基体吸收了大量的裂纹扩展能量。

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