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APPROACH TO THE DEVELOPMENT OF HIGH-CARBIDE CONTENT HIGH-SPEED STEEL MATRIX COMPOSITES

机译:高碳化物含量高速钢基复合材料发展的方法

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The objective of this study aims to the development of materials with properties between high-speed steels (HSS) and cemented carbides. Cemented carbides are harder and show higher wear resistance than HSS, but lower toughness. Besides, the substitution of Co or Ni for other binders is desirable due to the carcinogen character of these metals. This objective is not easy to achieve, as many investigations have shown. In this work, a material constituted by a HSS matrix and a 50% wt of carbides is developed. It has been seen that the mixing step could be the key point of the manufacture process when ferrous matrixes are involved. High-energy milling has been used to obtain a good bonding and homogeneous distribution of the carbides in the matrix. The carbides used are WC and TaC, and the matrix is a M3/2 HSS. A microstructural study was carried out after different times of mixing, until the best dispersion of carbides was achieved. Powders mixed during 10 h were characterised and compacted by die pressing. The green compacts were sintered at different temperatures, and properties like hardness and density were determined to draw the sinterability curves. A microstructural analysis by SEM completes the study.
机译:本研究的目的旨在开发具有高速钢(HSS)和硬质合金之间的性质的材料。粘合的碳化物较硬,显示出比HSS更高的耐磨性,但韧性较低。此外,由于这些金属的致癌特征,因此需要对其他粘合剂的CO或Ni取代。随着许多调查表明,这一目标并不容易实现。在这项工作中,开发了由HSS基质和50%WT碳化物构成的材料。已经看到混合步骤可以是当涉及亚铁基质时制造过程的关键点。高能铣削已被用于在基质中获得良好的粘接和均匀分布。使用的碳化物是WC和TAC,并且基质是M3 / 2 HSS。在混合的不同时间进行微观结构研究,直到达到碳化物的最佳分散体。 10小时内混合的粉末被模压挤压和压实。在不同的温度下烧结绿色块,并确定硬度和密度等性质以吸取烧结曲线。 SEM的微观结构分析完成了该研究。

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