将纯铬丝放入开有相应圆孔的HT250灰铸铁中, 在1 220 ℃保温30 min进行原位反应, 制备出了不同体积分数(Fe, Cr)7C3的铁基复合材料, 并采用XRD、SEM、硬度仪及磨损试验机等对复合材料的物相组成、显微组织、显微硬度及其磨料磨损性能进行了研究。结果表明: 复合材料的物相主要由碳化物(Fe, Cr)7C3、铁素体(α-Fe)及奥氏体(γ-Fe)组成; 随碳化物体积分数的增加, 复合材料的平均显微硬度逐渐增大, 最高值为1 453 HV0.1; 而在磨料磨损条件下的磨损量先降后升, 碳化物体积分数为62%时复合材料的耐磨性最好, 且与BTM20Cr高铬铸铁的耐磨性相当。

(Fe, Cr)7C3/Fe composites were fabricated by in-suit reaction at 1 220 ℃ for 30 min after pure chromium wires were placed in the holes drilled in the gray cast iron. The phase composition, microstructure, microhardness and abrasive wear performance of the composite with different volume fractions were tested by XRD, SEM, hardness instrument and wear tester. The results show that the composite was mainly composed of (Fe, Cr)7 C3, α-Fe and γ-Fe. The average microhardness of the composite increased with the increase of carbide volume fraction, and the highest microhardness reached to 1 453 HV0.1. The wear mass loss of the composite decreased firstly and then increased later with the increase of carbide volume fraction under abrasive wear condintion. The composite with carbide volume fraction of 62% presented the best wear resistance, as good as BTM20Cr high-chromium cast iron.