WC-Fe-Ni-Co-Cr cemented carbides have been obtained by liquid phase sintering from WC-Fe-Ni-Co-Cr₃C₂ powder mixtures. Taking the 40wt%Fe-40wt%Ni-20wt.%Co alloy as a reference, new binder phases has been prepared by introducing controlled amounts of Cr and C, via Cr₃C₂ and C black powders respectively. As described for WC-Co-Cr materials, Cr additions are observed to reduce the eutectic temperatures of the WC-Fe-Ni-Co system. First liquids detected on heating exhibit wide temperature melting ranges, which become narrower and are displaced to higher temperatures on repeated heating and cooling cycles. Apart from the decarburization associated to the carbothermal reduction of powder oxides, this phenomenon could be also associated to the homogeneization of the chemical composition of these multicomponent binder phases, which is faster as C content decreases. Correlation between experimental melting and solidification temperature ranges and those predicted by Thermocalc® is better as Cr content increases. Experimental C windows, defined in this work by the absence of free C or η phases, are located at C contents higher than those estimated by Thermocalc®. Although the 40wt.%Fe-40wt.%Ni-20wt.%Co alloy is austenitc, BCC phases are partially stabilized at low C and high Cr contents. Although these compositions are free from η phases or free C, a precipitation of Cr-rich carbides is found at the WC-metal interface. These precipitates are not observed in the alloy with 0.75 wt% Cr (i.e. 5 wt% of the nominal metal content) and 5.39 wt%C. This C content is 0.17 wt% higher than that predicted for precipitation of M₇C₃.

WC-Fe-Ni-Co-Cr硬质合金是通过液相烧结从WC-Fe-Ni-Co-Cr ₃ C ₂粉末混合物中获得的。以40wt％Fe-40wt％Ni-20wt。％Co合金为基准，通过经由Cr ₃ C ₂引入控制量的Cr和C，制备了新的粘合剂相和C黑色粉末。如对WC-Co-Cr材料所述，观察到Cr的加入会降低WC-Fe-Ni-Co系统的低共熔温度。在加热时检测到的第一批液体显示出较宽的温度熔化范围，在反复的加热和冷却循环中，熔化范围变窄，并转移到较高的温度。除了与粉末氧化物的碳热还原相关的脱碳作用外，这种现象还可能与这些多组分粘合剂相的化学成分均质化有关，随着C含量的降低，这种均化速度更快。随着Cr含量的增加，实验熔化温度和凝固温度范围与Thermocalc®预测的温度之间的相关性会更好。实验中的C窗口，在这项工作中是由于没有自由C或η相而定义的，碳含量高于Thermocalc®估计的含量。尽管40wt。％Fe-40wt。％Ni-20wt。％Co合金是奥氏体，但BCC相在低C和高Cr含量下部分稳定。尽管这些组合物不含η相或不含C，但在WC-金属界面处发现了富Cr碳化物的沉淀。在具有0.75 wt％的Cr（即标称金属含量的5 wt％）和5.39 wt％的C的合金中未观察到这些沉淀物。该C含量比M的沉淀预测的含量高0.17 wt％在具有0.75 wt％的Cr（即标称金属含量的5 wt％）和5.39 wt％的C的合金中未观察到这些沉淀物。该C含量比M的沉淀预测的含量高0.17 wt％在具有0.75 wt％的Cr（即标称金属含量的5 wt％）和5.39 wt％的C的合金中未观察到这些沉淀物。该C含量比M的沉淀预测的含量高0.17 wt％₇ C ₃。