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.
The WC-TiC steel bonded carbide was prepared by vacuum sintering using WC,TiC and Fe powder as raw materials,and its microstructure and properties were characterized by means of XRD,SEM and EDS analysis.The results show that with the molar ratio of TiC/WC increases,a clear ring structure appears in the alloy,grain refines at first and then becomes coarse.The density and relative density of the steel bonded carbide are reduced with the addition of TiC,and the macro-hardness of the alloy increases with the increasing of value of molar ratio of TiC/WC.When the value of molar ratio of TiC/WC is higher than 1.2,the hardness value decreases slightly.With the increasing of value of molar ratio of TiC/WC,the transvers rupture strength of the alloy increases at first and then decreases.The steel bonded hard alloy has the best comprehensive mechanical properties when the value of molar ratio of TiC/WC is in the range of O.8 to 1.0.
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