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Production of Iron - Molybdenum Carbide Composites by Hot Forging in the Presence of Liquid Phase

机译:在液相存在下热锻生产铁 - 钼碳化物复合材料

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A reduced pure iron powder was used as a basic material in the production of wear resistant iron - molybdenum carbide composites. Content of powders of milled eutectic white iron and molybdenum or ferromolybdenum was varied as well as the heating conditions of porous preforms prior to hot forging. In the course of the preheating the particles of cast iron fuse and wet the particles of iron and molybdenum (or ferromolybdenum). This is accompanied by carbon diffusion from cast iron particles into the depth of particles of matrix and molybdenous addition as well as by the formation of fine molybdenum carbides, which are variable in stoichiometric composition. The heating conditions' optimization together with the performance of the normalization provided for homogenization of material on carbon as well as for absence of "soft" zones poored in carbon. Diffusive pores near carbide particles are not observed. Excessive intermetallic phase at the grain boundaries of iron matrix does not precipitate. Hot forging in the presence of the liquid phase makes possible composites with high wear and thermal shock resistance resulting in a possibility of crack-free quenching in water.
机译:将纯铁粉末作为耐磨铁 - 钼碳化物复合材料的生产中,使用纯铁粉作为基础材料。碾磨的共晶白色铁和钼或铁钼粉的粉末含量变化,以及在热锻之前多孔预成型件的加热条件。在预热铸铁保险丝的颗粒的过程中,润湿铁和钼(或铁钼)颗粒。这伴随着从铸铁颗粒的碳扩散到基质颗粒的深度和钼添加以及形成细钼碳化物,其在化学计量组合物中是可变的。加热条件的优化与所提供的归一化物质均质化的归一化的性能以及在碳中染色的“软”区域的归一性。未观察到碳化物颗粒附近的扩散孔隙。铁基质的晶界的过量金属间相没有沉淀。在液相存在下热锻使具有高耐磨性和热抗震性的复合材料,导致水中无裂缝淬火的可能性。

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