电冶熔铸WC/钢复合材料的显微缺陷

Micro defects in tungsten carbide particulates reinforced steel matrix composites by electroslag melting and casting

采用电冶熔铸工艺将废弃的WC钢结硬质合金制备成WC/钢复合材料,研究了复合材料中显微缺陷的形貌及形成机理。结果表明:电冶熔铸WC/钢复合材料的气孔及夹杂含量少,可有效解决WC颗粒的偏析。X射线衍射、扫描电镜和透射电镜分析显示,WC颗粒和钢基体界面上发生了界面反应,生成了高稳定性的Fe3W3C界面层。

Tungsten carbide particulates reinforced steel matrix composites were fabricated by electroslag melting and casting process by using scrap tungsten carbide steel-bonded cement by powder metallurgy as raw material. Micro defects analysis shows that the tungsten carbide/steel metal matrix composite not only has low content of porosity and nonmetal inclusion, but also can alleviate tungsten carbide particulates aggregation remarkably. During the manufacturing process, the tungsten carbide particulates are partly melted because of high temperature. The melted tungsten carbide can react with the steel matrix at the interface. The reacting production is examined as Fe_3W_3C by means of X-ray diffraction, scanning electron microscopy and transmission electron microscopy.