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Effects of Sintering Conditions on Structures and Properties of Sintered Tungsten Heavy Alloy

机译:烧结条件对烧结钨重合金组织和性能的影响

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摘要

Probably the most advantageous fabrication technology of tungsten heavy alloys enabling the achievement of required performance combines methods of powder metallurgy and processing by intensive plastic deformation. Since the selected processing conditions applied for each individual processing step affect the final structures and properties of the alloys, their optimization is of the utmost importance. This study deals with thorough investigations of the effects of sintering temperature, sintering time, and subsequent quenching in water on the structures and mechanical properties of a 93W6Ni1Co tungsten heavy alloy. The results showed that sintering at temperatures of or above 1525 °C leads to formation of structures featuring W agglomerates surrounded by the NiCo matrix. The sintering time has non-negligible effects on the microhardness of the sintered samples as it affects the diffusion and structure softening phenomena. Implementation of quenching to the processing technology results in excellent plasticity of the green sintered and quenched pieces of almost 20%, while maintaining the strength of more than 1000 MPa.
机译:可能实现所需性能的钨重合金的最有利制造技术结合了粉末冶金和通过强烈塑性变形进行加工的方法。由于应用于每个单独加工步骤的选定加工条件会影响合金的最终结构和性能,因此优化它们至关重要。本研究对烧结温度,烧结时间以及随后在水中的淬火对93W6Ni1Co钨重合金的组织和力学性能的影响进行了深入的研究。结果表明,在1525°C或更高的温度下烧结会导致形成以NiCo基质包围的W团块为特征的结构。烧结时间对烧结样品的显微硬度有不可忽略的影响,因为它影响扩散和结构软化现象。通过对加工技术进行淬火,可以使生坯烧结和淬火件的可塑性极佳,几乎达到20%,同时保持了1000 MPa以上的强度。

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