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将纯Cr丝与灰铸铁进行复合,使纯Cr丝中的Cr原子与铸铁中的C发生原位反应生成(Fe,Cr)7C3,从而制备出(Fe,Cr)7C3/Fe复合材料。研究了不同反应时间下(Fe,Cr)7C3颗粒增强铁基复合材料的组织及不同Cr含量的复合材料的相对耐磨性。结果表明,复合材料主要由α-Fe、γ-Fe和(Fe,Cr)7C3组成,生成的(Fe,Cr)7C3呈颗粒或短棒状分布于铁基体中;随Cr含量增加,复合材料的相对耐磨性先增加后减小,当Cr含量为20%时,复合材料的耐磨性最好,为铸铁基体的7倍。
The pure Cr wire and gray cast iron were compounded to make (Fe, Cr) 7C3 / Fe composites by in-situ reaction of Cr atoms in pure Cr wire and C in cast iron to form (Fe, Cr) 7C3. The relative wear resistance of (Fe, Cr) 7C3 particles reinforced iron matrix composites and composites with different Cr contents were studied under different reaction time. The results show that the composites consist mainly of α-Fe, γ-Fe and (Fe, Cr) 7C3 and the (Fe, Cr) 7C3 particles are distributed in the Fe matrix as short or short rods. With the increase of Cr content, The relative wear resistance firstly increases and then decreases. When the Cr content is 20%, the wear resistance of the composite is the best, which is seven times that of the cast iron matrix.