摘要
采用激光熔覆方法在基体表面制备出高强高硬度耐磨涂层,借助光学显微镜、扫描电镜(SEM)、X射线衍射仪以及磨粒磨损试验机等试验仪器研究超声波功率对涂层组织与性能的影响.同时利用图像分析软件ImagePro Plus测量晶粒尺寸.结果表明,超声波功率对涂层组织与性能均有明显影响.随着超声波功率的增加,空化效应以及声流作用也越来越明显,晶粒尺寸由87μm减小到6μm.涂层硬度与相对耐磨性都呈先增加后减小的变化规律.当超声波功率增大到1 000 W时,晶粒尺寸最小,其最小值为6μm,涂层硬度达到最大值62 HRC,且其相对耐磨性也到最大,其耐磨性是基体的50倍左右.
The coating with high strength,high hardness and high wear resistance were prepared by laser cladding. The effect of ultrasonic power on the microstructure and properties was investigated through optical microscopy,SEM,XRD and MLS-23 wet sand rubber wheel tester. Meanwhile,the grain size was calculated by the Image-Pro Plus software. The results show the effect of ultrasonic power on microstructure and properties of the coating is very obvious. With the increasing of ultrasonic power,the grain size reduces from 87 μm to 6μm,which has a strong correlation with obvious cavitation effect and acousticstream. The hardness and relative wear resistance increase at first,then decrease. When the ultrasonic power is 1 000 W,the grain size is 6 μm. The hardness is very high,the value is 62 HRC. The relative wear resistance is very high,which is about 50 times than that of substrate.
出处
《焊接学报》
EI
CAS
CSCD
北大核心
2017年第5期74-78,共5页
Transactions of The China Welding Institution
基金
湖南省自然科学基金资助项目(2017JJ5032)
关键词
超声波功率
激光熔覆
显微组织
耐磨性
ultrasonic power
laser cladding
microstructure
wear resistance
