Effect of heat treatment on phase structure and thermal conductivity of a copper-infiltrated steel
Effect of heat treatment on phase structure and thermal conductivity of a copper-infiltrated steel
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DOI：
10.1007/s10853-015-8919-y
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发表时间：
2015-05-01
影响因子：
4.5
通讯作者：
Theisen, W.
中科院分区：
文献类型：
--
作者：
Klein, S.;Weber, S.;Theisen, W.
用铜浸渗工具钢是使用粉末冶金制造致密零件的合适且廉价的方法。在这项工作中，它表明，在渗透过程中形成的钢骨架内部的铜网络增强了所得复合材料的导热性。增强的程度取决于铜相的热导率和铜的体积分数。该复合材料的多次热处理揭示了复合材料的热导率和Fe在铜网络中的溶解状态之间的强烈依赖性。后者高度依赖于多相材料的热处理条件。与原始X245 VCrMo 9 -4-4钢相比，时效钢-铜复合材料的导热系数和电导率分别从和从增加。此外，制造了代表复合材料中的铜相网络的模型合金。通过测量该模型合金和散装钢的热导率，并将其与复合材料的数据进行比较，讨论了用于计算复合材料的总热导率的不同模型。
Infiltration of tool steels with copper is a suitable and cheap method to create dense parts using powder metallurgy. In this work, it is shown that the copper network that forms inside the steel skeleton during infiltration enhances the thermal conductivity of the resulting composite. The level of enhancement is dependent on the thermal conductivity of the copper phase and the volume fraction of copper. Multiple heat treatments of this composite revealed a strong dependency between the thermal conductivity of the composite and the solution state of Fe in the copper network. The latter is highly dependent on the heat-treated condition of the multi-phase material. Using infiltration, the thermal and electrical conductivity was increased from and from respectively, for aged steel-copper composite in comparison with original X245VCrMo9-4-4 steel. In addition, a model alloy that represents the copper-phase network in the composite was manufactured. By measuring both, the thermal conductivity of this model alloy and the bulk steel, and comparing it to the data for the composite, different models for calculating the overall conductivity of the composite are discussed.