激光熔覆TiCp/NiCrBSi复合涂层的组织与摩擦学性能  

Investigation on the Microstructure and Properties of Laser Clad TiCp/NiCrBSi Alloys Composite Coating

作　　者：王新洪[1] 张敏[2] 邹增大[1] 曲仕尧[1] 

机构地区：[1]山东大学材料学院,山东济南250061 [2]山东大学机械学院,山东济南250061

出　　处：《中国激光》2003年第6期562-566,共5页Chinese Journal of Lasers

基　　金：山东省自然科学基金资助项目(Z2 0 0 0F0 2 )

摘　　要：应用激光表面改性方法 ,在 4 5 # 钢表面熔覆了TiCp/Ni Cr B Si C复合涂层 ,利用SEM ,TEM分析以及磨损试验 ,研究了复合涂层的组织特点和耐摩擦磨损性能及其影响规律 ,并探讨了添加稀土氧化物改善复合涂层的组织性能及稀土氧化物的作用机制。结果表明 ,TiC颗粒在熔覆层中发生部分溶解和重新析出 ;熔覆层与基体形成交互扩散区 ,在该区中发现 (Fe ,Cr) 2 3 C6碳化物 ,同时还形成大量α和γ微晶 ,局部区域存在Ni Si B Re非晶相。在凝固应力作用下 ,TiC颗粒与粘结金属界面之间存在大量的孪晶和位错。稀土氧化物对复合涂层显微硬度提高幅度不大 ,但能明显地减小复合涂层的摩擦系数 ,显著提高涂层干摩擦磨损状态下的耐磨性。TiC含量为 4 5 %～ 5 0 %时 。Laser processing was used to deposite TiCp/Ni Cr B Si C composite coatings on 45 # steel. The microstructure and wear properties were investigated by means of SEM, TEM, and wear test. The mechanism of surface modification of La 2O 3 on the composite coatings was also discussed. The results showed that TiC partly dissolved in the laser melt pool during melting. There were twins and dislocations at the interface of particle TiC and matrix due to the solidifying stress. The interdiffusion zone was formed between the coating and matrix. The carbides of (Fe,Cr) 23 C 6, the micro crystal of α and γ were discovered in the interdiffusion zone. The amorphous phase of Ni Si B La was formed at the interface. The wear resistance of coating was affected by rare earths and the content of TiC. The coatings possessed optimal wear resistance when the mass fraction of TiC was 45%～50%.

关 键 词：激光技术 激光熔覆 激光表面改性 显微组织 TiCp/Ni合金涂层 摩擦磨损 

分 类 号：TG665[金属学及工艺—金属切削加工及机床]