【摘要】 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。更多还原

【Abstract】 WC reinforced Fe-based composite was prepared by hot pressing sintering with two kinds of Febased pre-alloyed powders of EXD602 and EXDNi105and WC powder as the raw materials.The effects were investigated of different WC content and alloy matrix on microstructure and properties of the composite.The results show that the hardness,density and wear resistance of WC-EXD602 composite are much higher than those of WC-EXDNi105.With the increase of WC content,both hardness and density of WCEXD602 and WC-EXDNi105 composites increase firstly and then decrease,while wear loss decreases firstly and then increases.When the content of WC is 30%,peak hardnesses of WC-EXD602 and WC-EXDNi105 are HRA64.8and HRA48.6,respectively,and the porosity is the lowest.When the content of WC is 45%,wear loss of the two composites is the lowest.WC and alloy matrix alternately frictionize throughout wear process,and the main wear mechanism is abrasive wear.There is no obvious passivation phenomenon in the corrosion polarization curves of WC-EXD602 and WC-EXDNi105 samples.The descending order of the above composites according to their corrosion resistance is as follows:15WC-EXD602>15WC-EXDNi105>75WC-EXDNi105>75WC-EXD602.With WC content increasing,the corrosion resistance of the composites decreases in 3.5% NaCl solution.更多还原