SiC含量对激光熔覆原位合成WC增强铁基合金涂层组织与性能的影响

摘要

Using the alloy powders with different SiC contents (0-12wt%)as raw material,WC particles reinforced iron-based coatings were in-situ synthesized on 45 steel surface by laser cladding;The effects of SiC content on microstructure,hardness and wear resistance of the coatings were investigated.The results show that, with the increase of mass fraction of SiC in alloy powders,the content and size of WC increased,while the content and size of Fe3 W3 C increased firstly and then declined.The hardness and wear resistance of the coatings increased firstly and then declined.When the mass fraction of SiC in alloy powders was 8%,the hardness of the coating was 59 HRC,and its relative wear resistance was about 24 times of the substrate.%以不同SiC含量(质量分数为0~12％)的合金混合粉为预置粉体,采用激光熔覆法在45钢表面原位合成了 WC颗粒增强铁基合金涂层,研究了 SiC 含量对涂层组织、硬度和耐磨性能的影响。结果表明：随着混合粉中SiC的质量分数增加,涂层中 WC的含量与尺寸逐渐增加,贫碳相Fe3 W3 C的含量与尺寸先增加后减小,涂层的硬度与耐磨性先增加后减小；当SiC的质量分数为8％时,涂层的硬度与耐磨性都达到最大值,其硬度为59 HRC,相对耐磨性约为基体的24倍。