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将纯铬丝放入开有相应圆孔的HT250灰铸铁中,在1 220℃保温30min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 453HV0.1;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。
The pure chrome wire was put into the HT250 gray cast iron with the corresponding circular holes and in-situ reacted at 1 220 ℃ for 30min to prepare the iron-based composite with different volume fraction (Fe, Cr) 7C3. The XRD, SEM, hardness tester and wear tester on the phase composition, microstructure, microhardness and abrasive wear properties of the composites were studied. The results show that the phase of the composites consists mainly of carbide (Fe, Cr) 7C3, ferrite (α-Fe) and austenite (γ-Fe). With the increase of the volume fraction of carbides, The microhardness gradually increases with the highest value of 1 453HV0.1; while the wear loss decreases first and then increases under the condition of abrasive wear, and the wear resistance of the composite is the best when the carbide content is 62% Chromium cast iron wear resistance quite.