高速钢表面激光熔覆TiC-Fe3Al-Ni熔覆层的摩擦磨损特性

Friction and Wear Behavior of Laser Cladding TiC-Fe3Al-Ni Coatings on High-speed Steel Surface

为改善高速钢耐磨性,在高速钢表面预置Ti C-Fe3Al-Ni粉末层,利用激光熔覆技术在激光扫描速度分别为1、3、5 mm/s下制备熔覆层,对熔覆层的物相、显微硬度及摩擦磨损特性进行研究。结果表明:熔覆层主要由Ti C、Al Ni、TiWC2、AlV3、C5Ti4W、FeO和Ti O相构成。随着激光扫描速度的增加,熔覆层平均摩擦因数逐渐降低,最小为0.27;平均显微硬度逐渐提高,最高为2674 HV;耐磨性逐渐提高,最高比基体提高约15倍。熔覆层的磨损机制逐渐由粘着磨损、磨料磨损转变为剥层磨损。

In order to improve the tribological behavior of high-speed steel,TiC-Fe3Al-Ni alloy powders were preseted on the surface of high-speed steel,the cladding layers were prepared by laser cladding technique at laser scanning speed of 1,3,and 5 mm/s.The phases,microhardness and wear resistance of the cladding layers were studied.The results show that the cladding layers mainly consists of TiC,AlNi,TiWC2,AlV3,C5Ti4W,FeO and TiO.As the laser scanning speed increases,the average friction coefficient of the cladding layer gradually decreases,the minimum is 0.27 and the average microhardness of the cladding layer gradually increases,up to 2674 HV;the wear resistance of the cladding layer gradually increases,and the highest wear resistance is about 15 times higher than that of the substrate.The wear mechanism of the cladding layer gradually changes from adhesive wear and abrasive wear to delamination wear.