激光熔覆Fe55/Cr<sub>3</sub>C<sub>2</sub>涂层组织及耐磨性能研究

激光熔覆Fe55/Cr₃C₂涂层组织及耐磨性能研究

摘要: 采用SEM、EDS、XRD等手段研究了Cr₃C₂添加量对激光熔覆制备Fe55/Cr₃C₂熔覆层组织和耐磨性能的影响。结果表明，激光熔覆制备的Fe55/Cr₃C₂熔覆层显著提高了H13钢表面显微硬度及耐磨性能。Fe55/Cr₃C₂熔覆层以Cr₇C₃、Cr₂B、Fe₂B硬质相为主，在熔覆层中起到骨架增强作用，可有效抑制磨损过程中的塑性变形。当混合粉末中Cr₃C₂含量为20%时，熔覆层组织中的晶粒尺寸由31.6 μm减小到19.6 μm，熔覆层最高显微硬度达到1504.7 HV0.2，是基体的4.1倍，磨损率仅为原始试样的0.32%。

Abstract: The effects of Cr₃C₂ content on the microstructure and wear resistance of Fe55/Cr₃C₂ coatings prepared by laser cladding were investigated using SEM, EDS, and XRD techniques. The results show that the Fe55/Cr₃C₂ coatings significantly improve the microhardness and wear resistance of the H13 steel surface. The Fe55/Cr₃C₂ coatings primarily consist of hard phases such as Cr₇C₃, Cr₂B, and Fe₂B, which act as a reinforcing framework and effectively inhibit plastic deformation during the wear process. When the Cr₃C₂ content in the powder mixture is 20%, the grain size in the coating decreases from 31.6 μm to 19.6 μm, and the maximum microhardness of the coating reaches 1504.7 HV0.2, which is 4.1 times higher than that of the substrate. The wear rate is only 0.32% of that of the original sample.