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Microstructure and Formation Mechanism of Vanadium Carbide-Reinforced Iron-Matrix Composites Prepared by Solid-Phase Diffusion

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Vanadium carbide-reinforced iron-matrix composites were produced via solid-phase dispersion method that included heat treatment at 1223, 1273, and 1323 K for different times. The vanadium carbide layers (V2C and V8C7 dense layers) were characterized by scanning electron microscopy (SEM), X-ray diffraction (XRD), and the Vickers hardness test. The kinetics of vanadium carbide layers were analyzed with an Arrhenius-type equation. The results showed that the vanadium carbide-reinforced iron-matrix composites consist of -Fe, V2C, and V8C7 with an incomplete reaction of V. The thickness of the V2C and V8C7 dense layers ranged from 5.11± 0.41 μm to 17.43 ± 1.43 μm and from 16.30 ± 1.52 μm to 76.32 ± 3.26 μm, respectively, depending on the treatment time and temperature. The average micro-hardness of the vanadium carbide-reinforced iron-matrix composites varied according to the different zones: 1963 HV0.1 (V2C layer), 1707 HV0.1 (V8C7 dense layer), and 235 HV0.1 (matrix). The dynamics of the layers indicated that the layer thickness and the process time had a parabolic relationship. And the relationship demonstrated that pervasion had a strong impact on the layer covering.
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Keywords: KINETICS; MICRO-HARDNESS; SURFACE COMPOSITES; VANADIUM CARBIDE

Document Type: Research Article

Publication date: September 1, 2019

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  • Science of Advanced Materials (SAM) is an interdisciplinary peer-reviewed journal consolidating research activities in all aspects of advanced materials in the fields of science, engineering and medicine into a single and unique reference source. SAM provides the means for materials scientists, chemists, physicists, biologists, engineers, ceramicists, metallurgists, theoreticians and technocrats to publish original research articles as reviews with author's photo and short biography, full research articles and communications of important new scientific and technological findings, encompassing the fundamental and applied research in all latest aspects of advanced materials.
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