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本文利用扫描电镜、图像分析仪系统研究了高速铜铸态碳化物的空间形态、精细结构及合金元素钨、钼、钒对共晶碳化物形态的数量的影响。结果表明:钢中增钼减钨,共晶碳化物由骨骼状的M_6~-C向层片状和棒条状的M_2C过渡,共晶碳化物总量降低,MC碳化物的数量增加。钒不仅有利于MC碳化物的形成,而且明显促使M_2C碳化物的形成,抑制M_6~-C碳化物的形成。随着钢中钒含量的增加,碳化物逐渐粗化。
In this paper, the scanning electron microscope and image analyzer system were used to study the spatial morphology, fine structure and the effects of alloying elements of tungsten, molybdenum and vanadium on the morphology of eutectic carbide. The results show that the addition of molybdenum to tungsten decreases the content of molybdenum in the steel, and the eutectic carbides transition from the skeletal M_6 ~ C to lamellar and rod-like M_2C. The total eutectic carbides decrease and the amount of MC carbides increases. Vanadium not only contributes to the formation of MC carbides, but also promotes the formation of M_2C carbides and inhibits the formation of M_6 ~ C carbides. As the vanadium content in the steel increases, carbides gradually coarsen.