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采用复合电冶熔铸技术,制备了以WC颗粒为增强体,5Cr Ni Mo模具钢为基体的WC/钢复合材料,WC颗粒含量为45wt%。采用金相显微镜、扫描电子显微镜、能谱仪、电子背散射衍射仪和X射线衍射分析仪研究了复合材料中WC的形态和退火、锻造、淬火与回火处理对WC增强体转变的影响。结果表明,WC/钢复合材料中以三角形或矩形的WC为主;通过退火和锻造处理,碳化物溶解,共晶组织碎化;淬火加热温度升高,碳化物溶解加速,基体上分布大量细小的二次碳化物,共晶碳化物变化不明显;回火温度提高,碳化物分布更加均匀化,颗粒圆整性增强,碳化物聚集现象减少。存在的碳化物类型主要为WC颗粒、较大的Fe3W3C颗粒、Fe3W3C或M7C3枝晶状碳化物、弥散分布的Fe3W3C或M23C6二次碳化物。
The WC / steel composite material with WC particles as reinforcing body and 5Cr Ni Mo die steel as base material was prepared by the composite electrofusion casting technology. The content of WC particles was 45wt%. The morphology of WC and the effect of annealing, forging, quenching and tempering on the WC reinforcements were investigated by metallographic microscope, scanning electron microscopy, energy dispersive spectroscopy, electron backscatter diffraction and X-ray diffraction analyzer. The results show that the WC / steel composites mainly consist of triangular or rectangular WC. The carbide is dissolved and the eutectic structure is shredded by annealing and forging treatment. The quenching heating temperature is increased and the carbides are dissolved and accelerated. Of the second carbide, eutectic carbide changes are not obvious; tempering temperature increases, more uniform distribution of carbides, particle roundness enhancement, reduction of carbide aggregation. The main types of carbides are WC particles, larger Fe3W3C particles, Fe3W3C or M7C3 dendritic carbides, dispersed Fe3W3C or M23C6 second carbides.