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以EXD602和EXDNi105两种Fe基预合金粉和WC粉为原料,采用热压烧结法制备WC增强Fe基复合材料,研究不同WC含量及基体合金对复合材料组织与性能的影响。结果表明:在硬度、致密度和耐磨性方面,WCEXD602试样明显高于WC-EXDNi105试样。随着WC含量的增加,WC-EXD602和WC-EXDNi105复合材料的硬度及致密度均先增大后减小,磨损量则先减小后增大;当WC含量为30%时,峰值硬度分别为HRA64.8和HRA48.6,孔隙率最低;当WC含量为45%时,复合材料的磨损量最低。在整个磨损过程中,WC与基体合金交替磨擦,磨损机制主要以磨粒磨损为主。WC-EXD602和WC-EXDNi105试样的腐蚀极化曲线均未出现明显的钝化现象,按耐蚀能力大小排序为15WC-EXD602>15WC-EXDNi105>75WC-EXDNi105>75WC-EXD602。在3.5%NaCl溶液中,材料耐蚀性能随WC含量的增加而降低。
Two kinds of Fe-based pre-alloyed powders EXD602 and EXDNi105 and WC powder were used as raw materials. WC-reinforced Fe-based composites were prepared by hot-pressing sintering. The effects of different WC contents and matrix alloy on the microstructure and properties of the composites were studied. The results show that the WCEXD602 sample is significantly higher than the WC-EXDNi105 sample in terms of hardness, density and wear resistance. With the increase of WC content, the hardness and density of WC-EXD602 and WC-EXDNi105 composites firstly increased and then decreased, while the wear volume first decreased and then increased. When WC content was 30%, the peak hardness The porosity was the lowest for HRA64.8 and HRA48.6, and the lowest for composite with 45% WC. Throughout the wear process, WC and base alloy alternating friction, the wear mechanism mainly abrasive wear-based. The corrosion polarization curve of WC-EXD602 and WC-EXDNi105 samples showed no obvious passivation phenomenon. The order of corrosion resistance was 15WC-EXD602> 15WC-EXDNi105> 75WC-EXDNi105> 75WC-EXD602. In 3.5% NaCl solution, the corrosion resistance of the material decreases with the increase of WC content.