热反应扩散法在钒铁、铬铁和杂金属H13工具钢表面涂层中的应用

Nastran Najafian, A. Moloodi, E. Karimi
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摘要

热反应扩散(TRD)工艺是一种提高材料硬度、耐腐蚀性和耐磨性的表面硬化方法。在这项研究中,通过使用8、12、16、20和24 wt%的等量铬铁和钒铁,以及3 wt%的铝和硼砂,研究了组成的影响。对aisih13热加工工具钢在1000℃下进行7小时的TRD处理,在H13基体上形成了一层复杂的碳化钒铬涂层。利用光学显微镜和扫描电镜分别对样品的厚度和微观结构进行了评价。利用点分析和x射线衍射分析了合金表面合金元素和组成相的含量。采用显微硬度法对样品进行硬度评定。研究结果表明,随着铁合金用量的增加,涂层的硬度和厚度都有所增加。结果表明,以8%铬铁和8%钒铁为最佳配比,镀层厚度为7.65 μm,硬度为2115 HV。
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Applying Thermo-Reactive Diffusion Method to Surface Coating of H13 Tool Steel Using Ferrovanadium, Ferrochromium, and Misch Metal
The thermo-reactive diffusion (TRD) process is a method for surface hardening that improves the hardness, corrosion resistance, and wear resistance of the materials. In this study, the effect of composition was investigated, by using 8, 12, 16, 20, and 24 wt% of ferrochrome and ferrovanadium with equal amounts, along with 3 wt% aluminum and borax. The TRD process was carried out at 1000°C for 7 hours on AISI H13 hot work tool steel so that a complex coating of chromium-vanadium carbide was formed on the H13 substrate. Optical and scanning electron microscopes were used to evaluate the thickness and microstructure of the samples, respectively. Moreover, the amount of alloying elements and constituent phases on the surface were analyzed by point analysis and X-ray diffraction. The micro-hardness method was used to evaluate the hardness of the samples. The results of this study showed that by increasing the amount of ferroalloy, the hardness and thickness of the coating increase. The optimal composition with 8% ferrochrome and 8% ferrovanadium was found to yield a coating with a thickness of 7.65 μm and a hardness of 2115 HV.
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