WC颗粒对激光熔覆高熵合金SiFeCoCrTi涂层的组织及性能的影响

Effect of WC Particles on The Microstructure and Properties of High Entropy Alloy SiFeCoCrTi Coating Synthesised by Laser Cla

摘要:

采用激光熔覆技术，在Q235钢基体上制备了高熵合金SiFeCoCrTi涂层, 并研究了WC颗粒对高熵合金涂层的组织及性能的影响。采取OM，XRD，SEM，硬度实验，磨损实验等手段探究了高熵合金涂层的微观形貌，相结构，硬度及磨损性能。实验结果表明，高熵合金SiFeCoCrTi涂层组织为胞状枝状晶，主要由BCC相和金属间化合物构成，添加WC后，涂层中形成了致密细小的枝状晶，而且形成了大量的金属间化合物，如TiCo3、Co1.07Fe18.93。同时WC添加使得基材的稀释率降低，涂层的性能明显增强，其涂层平均硬度提升23%，涂层摩擦系数和磨损率都明显减小, ,耐磨性能显著提高。

Abstract:

high entropy alloy (HEA) SiFeCoCrTi coating is prepared on Q235 steel by laser cladding. effect of WC Particles on the Microstructure and Properties of High Entropy Alloy SiFeCoCrTi coating is researched.in this paper, the organization,phase, microhardness and wear resistance are investigated by means of OM，XRD，SEM, hardness testing and wear testing. the experimental result shows that he microstructure of the HEA SiFeCoCrTi coating is dendrite consisting of BCC phase and intermetallics. the coating form grain dendrite after adding WC particle, and large amounts of intermetallics are found in the coating, such as TiCo3、Co1.07Fe18.93. the substrate’s dilution rate decrease and the properties of coating increase with adding WC particle. comparing to the HEA FeSiCrCoMo coating, the average hardness of the HEA FeSiCrCoMo coating increased by 23% and both of wear rate and friction coefficient decreased with adding WC, the wear-resisting property is improved obviously.