K417G合金激光沉积CoCrW合金耐磨层的组织与性能  

The Microstructure and Properties of CoCrW Alloy Coating Deposited by Laser on K417GAlloy

作　　者：卞宏友 黎瑞涛 刘伟军 邢飞 徐效文 Bian Hongyou;Li Ruitao;Liu Weijun;Xing Fei;Xu Xiaowen(School of Mechanical Engineering,Shenyang University of Technology,Liaoning Provincial Key Laboratory of Laser Surface Engineering Technology,Shenyang110870,Liaoning,China)

机构地区：[1]沈阳工业大学机械工程学院,辽宁省激光表面工程技术重点实验室,辽宁沈阳110870

出　　处：《应用激光》2024年第8期9-17,共9页Applied Laser

基　　金：辽宁“百千万人才工程”资助项目(LNBQW2020B0050);辽宁省高校创新人才项目(202114027)。

摘　　要：采用激光沉积技术在K417G合金表面制备CoCrW合金耐磨层,研究激光工艺参数对耐磨层稀释率的影响规律,并实现激光工艺参数优化;在此基础上,进行多道多层耐磨层制备试验,分析测量耐磨层的显微组织、硬度与摩擦磨损性能。结果表明,激光功率和扫描速度对耐磨层稀释率影响较大,降低激光功率和扫描速度可有效减小稀释率。采用优化的激光工艺参数制备的耐磨层宏观形貌良好、内部无裂纹,耐磨层底部至顶部的组织分别为柱状晶和等轴晶,耐磨层的主要物相为γ-Co相、M_(7)C_(3)以及M_(23)C_(6)。耐磨层平均显微硬度为605.97 HV,为基体平均显微硬度的1.8倍。在室温摩擦条件下,耐磨层的平均摩擦系数为0.37,20 min的磨损量为0.8 mg,与基体相比分别降低了55%、37%;耐磨层的磨损机制为轻微磨粒磨损和黏着磨损,基体的磨损机制为严重的磨粒磨损与黏着磨损。This study focused on the preparation of CoCrW alloy coatings on K417Galloy substrates using laser deposition technology.The influence of laser process parameters on the dilution rate of the coating was investigated,and the parameters were optimized accordingly.Multi-pass multilayer coating preparation tests were then conducted to analyze the microstructure,microhardness,and frictional wear properties of the coating.The experiments results showed that:Laser power and scanning speed have a large impact on the dilution rate of the coating,and reducing the laser power and scanning speed can effectively reduce the dilution rate.The coating prepared by the optimized laser process parameters has good macroscopic morphology and no internal cracks,the microstructure from the bottom to the top of the coating is columnar crystal and equiaxed crystal,respectively.The main phases of the coating are theγ-Co,M_(7)C_(3),and M_(23)C_(6).The average microhardness of the coating is 605.97HV,which is 1.8times of the average microhardness of the substrate.Under room temperature friction conditions,the average friction coefficient of the coating is 0.37,and the wear amount is 0.8mg in 20min,compared with the matrix,it is reduced by 55%and 37%respectively.The coating′s wear mechanism was slight abrasive wear with adhesive wear,while the substrate′s wear mechanism was severe abrasive wear with adhesive wear.

关 键 词：K417G合金 CoCrW合金 激光沉积耐磨层 显微组织 摩擦磨损 

分 类 号：TN249[电子电信—物理电子学]