激光熔覆原位生成NbC/Ni45合金涂层组织与性能的研究  

Investigation of Microstructure and Poperties of NbC/Ni45 Alloy Composite Coating by Laser Cladding

作　　者：谢颂京[1,2] 董刚[2] 

机构地区：[1]浙江经济职业技术学院,浙江杭州310018 [2]浙江工业大学激光加工技术工程研究中心,浙江杭州310014

出　　处：《应用激光》2012年第6期459-463,共5页Applied Laser

基　　金：浙江省教育厅资助项目(项目编号:Y201120010)

摘　　要：利用CO2激光器在45#钢基体上成功制备了原位生成NbC颗粒增强的镍基合金涂层,涂层与基体呈现良好的冶金结合,无裂纹气孔等缺陷。涂层组织主要有γ-Ni树枝晶,枝晶间大量的共晶组织,M2(3CB)6型碳化物和弥散分布的原位生成的NbC颗粒组成。带核的NbC颗粒是以为完全溶解的Nb为核心在其上长大的。由于原位生成NbC颗粒在复合涂层中的均匀分布,使涂层的平均显微硬度高达HV0.2 750,比纯Ni45合金涂层提高了约36%。The in situ synthesized NbC particles reinforced Ni-based alloy composite coating has been successfully prepared on 1045 steel substrate by laser cladding. The coating is free of pores and cracks with excellent bonding between the coating and the substrate. The microstructure of the coating is mainly composed of 7-Ni dendrite, a large amount of interdendritic eutectics, M23 （CB）6 type carbides and dispersed NbC particles. The growth mechanism of the NbC particles with cores is nucleation-growth and the un-melted niobium may act as the nucleation core for NbC. Compared to the pure Ni-based alloy coating, the hardness of the composite coating is increased about 36 %, giving a high average hardness of approximate HV0.2750. This is attributed to the presence of in situ Synthesized NbC particles and their well distribution in the coating.

关 键 词：激光熔覆 原位生成 NbC颗粒 Ni45合金 显微硬度 

分 类 号：TG146.2[一般工业技术—材料科学与工程]