摘要
采用光纤激光器在45钢基体上制备了Co/WC增强Ni基复合涂层。利用扫描电镜(SEM)、能谱仪(EDS)、显微硬度计及摩擦磨损试验机等研究了熔覆层的微观组织、成分分布、硬度及耐磨性。结果表明:激光功率对WC分布具有一定影响,随激光功率增加,WC分布更加均匀,但WC烧蚀程度也有所增加,熔覆层的显微硬度整体上呈先上升后下降趋势;当激光功率为700 W时,熔覆层主要包括WC、FeNi3及Co3W、WB2等物相,此时熔覆层平均硬度最高,达到730 HV0.3,是基体(195 HV0.3)的3.7倍,熔覆层磨损率(2.87×10^-4g/m)是基体磨损率(9.18×10^-4g/m)的1/3。
Co/WC enhanced Ni-based composite coatings were fabricated on 45 steel substrate by fiber laser with different power.Microstructure,composition distribution,microhardness and wear resistance of the coatings were studied by means of scanning electron microscopy( SEM),energy dispersive spectroscopy( EDS),microhardness tester and friction and wear tester.The results show that the laser power has a certain effect on the distribution of WC.With the increase of laser power,the distribution of WC is more uniform,but the degree of WC ablation also increases,and the microhardness of the coatings increases at first and then decreases.When the laser power is 700 W,the coating mainly includes WC,FeNi3,Co3W and WB2 phases,the average hardness of the coating is the highest( 730 HV0.3),which is 3.7 times of that of the matrix( 195 HV0.3),and the wear rate of the coating(2.87×10^-4g/m) is only 1/3 of that of the matrix( 9.18×10^-4g/m).
作者
朱福栋
朱必云
马长平
ZHU Fu-dong;ZHU Bi-yun;MA Chang-ping(Department of Mechanical Engineering,Ordos Vocational College,Ordos 017000,China)
出处
《材料热处理学报》
EI
CAS
CSCD
北大核心
2019年第9期142-148,共7页
Transactions of Materials and Heat Treatment
基金
内蒙古自治区高等学校科学研究项目(NJZY18314)
关键词
增材制造
激光熔覆
复合涂层
显微组织
耐磨性能
additive manufacturing
laser cladding
composite coating
microstructure
wear resistance
