论文部分内容阅读
以WC、TiC以及Fe粉为原料,通过改变WC-TiC钢结硬质合金的硬质相组成,研究合金组织及力学性能的变化特点。采用X射线衍射(XRD)、扫描电镜(SEM)和能量色散谱仪(EDS)等手段对制备的样品进行表征。结果表明,随着TiC/WC摩尔比值σ的增大,合金出现了明显的环形结构,晶粒先细化后粗化。TiC的添加降低了钢结硬质合金的密度和致密度,合金宏观硬度随σ值的增大而增大,当σ>1.2时,硬度值略有下降。合金的抗弯强度随σ值的增大呈先降低后升高再降低的趋势,当σ值在0.8~1.0范围时合金的综合力学性能最佳。
Using WC, TiC and Fe as raw materials, the microstructure and mechanical properties of WC-TiC cemented carbide were studied by changing the hard phase composition. The prepared samples were characterized by XRD, SEM and EDS. The results show that with the increase of the molar ratio σ of TiC / WC, the alloy has an obvious ring structure, and the grains are refined and roughened first. The addition of TiC reduced the density and density of the hardmetal. The macroscopic hardness of the alloy increased with the increase of σ. When σ> 1.2, the hardness decreased slightly. The bending strength of the alloy decreases first, then increases and then decreases with the increase of σ. When the σ value is in the range of 0.8 to 1.0, the mechanical properties of the alloy are the best.