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采用铸渗和热处理原位反应工艺相结合的方法,将准1 mm的钒丝与灰铸铁进行复合,制成钒丝-灰铸铁复合预制体,并对其进行热处理,使钒丝中的钒原子与铸铁中的碳原子原位反应生成V8C7颗粒,制备出V8C7颗粒增强铁基复合材料。用SEM、XRD对该复合材料的显微组织和物相组成进行分析。结果表明,生成的V8C7颗粒均匀分布于铁基体中,且生成物与基体有很好的冶金结合,反应区主要由α-Fe和V8C7颗粒组成;应用热力学原理对原位合成V8C7颗粒的反应机理进行分析,表明用此方法制备的V8C7增强相在热力学上是可行的。
A method of combining infiltration seepage and heat treatment in-situ reaction process is adopted to composite a quasi-1 mm vanadium wire and gray cast iron to prepare a vanadium wire-gray cast iron composite preform, which is heat treated to make vanadium The atoms and the carbon atoms in cast iron react in situ to form V8C7 particles, to prepare V8C7 particles reinforced iron matrix composite. The microstructure and phase composition of the composites were analyzed by SEM and XRD. The results show that the formed V8C7 particles are uniformly distributed in the iron matrix, and the product has a good metallurgical bond with the matrix. The reaction zone is mainly composed of α-Fe and V8C7 particles. The reaction mechanism of in-situ synthesis of V8C7 particles The analysis shows that the V8C7 reinforced phase prepared by this method is thermodynamically feasible.