原位生成VC颗粒增强镍基激光熔覆层研究  

Investigation on in-situ synthesized VC particulate reinforced Ni-based composite coating by laser cladding

作　　者：孙海勤[1] 晁明举[1] 敬晓定[1] 张现虎[1] 

机构地区：[1]郑州大学物理工程学院材料物理教育部重点实验室,郑州450052

出　　处：《激光杂志》2008年第5期69-71,共3页Laser Journal

基　　金：河南省教育厅自然科学研究计划(200510459005和2006140009)基金资助

摘　　要：利用5kW横流连续波CO2激光器,在45#钢表面制备原位自生VC颗粒增强镍基复合涂层。利用金相显微镜、扫描电镜、电子能谱、X射线衍射仪研究了熔覆层的显微组织,并对其进行了硬度测量和摩擦性能试验。结果表明:原位自生VC颗粒增强镍基熔覆层平均硬度高达HV0.31300,且耐磨性得到显著提高。与纯Ni60熔覆层相比,其摩擦磨损失重约减小一半。分析认为,其硬度和耐磨性提高的原因在于涂层中VC-Cr3C2固溶间隙相和Cr3C2颗粒相的形成及其在γ(NiFe)/B(Fe,Si)3共晶基体中的均匀分布。In situ synthesized VC particulate reinforced Ni-based composite coating on steel 45# substrate was fabricated using a 5 kW continuous wave CO2 laser.The microstructure and phase constituents of the composite coating were investigated by optical microscope,scanning electron microscope,energydispersive spectrometer and X-ray diffractometer.The hardness test in the cross-section and tribotesting onto the surface of the laser cladding were also accomplished.The results indicated that the in-situ synthesized VC -particulate reinforced Ni - based composite coating has a high average hardness of HV0.3 1300 and a better wear resistance. The mass loss of the composite coating in a block on ring test against the hardened steel is only haft than that of pure Ni60 coating. The enhance- ment in hardness and wear resistance of the composite coating is due to the presence of in - situ synthesized of VC - Cr3C2 particles and their well distribution in the euteetic matrix γ （NiFe） /B（Fe Si）2.

关 键 词：激光熔覆 原位生成VC 显微组织 耐磨性 

分 类 号：TN249[电子电信—物理电子学] TG665[金属学及工艺—金属切削加工及机床]