激光功率对铁基复合涂层组织与性能的影响  

Effects of Laser Power on Microstructure and Properties of Fe-based Composite Coatings

作　　者：王波 刘文义[2] 徐峰[2] 林相 冉启科 王欢乐 Wang Bo;Liu Wenyi;Xu Feng;Lin Xiang;Ran Qike;Wang Huanle(Xi’an Heavy Equipment Pubai Coal Mine Machinery Co.,Ltd.,Weinan 715500,China;School of Materials Science and Engineering,Shaanxi University of Technology,Hanzhong 723001,China;Chongqing Institute of SpecialEquipment Inspection and Research,Chongqing 401121,China)

机构地区：[1]西安重装蒲白煤矿机械有限公司,陕西渭南715500 [2]陕西理工大学材料科学与工程学院,陕西汉中723001 [3]重庆市特种设备检测研究院,重庆401121

出　　处：《煤矿机械》2025年第3期112-115,共4页Coal Mine Machinery

基　　金：2024年度陕西省教育厅服务地方专项科学研究计划项目(24JC022)。

摘　　要：为了探究激光功率对铁基复合涂层组织与性能影响,采用功率为690 W、750 W、810 W、870 W,扫描速度为0.004 m/s,在Q345钢表面制备复合涂层。通过金相显微镜、扫描电子显微镜、X射线衍射仪、维氏显微硬度计和摩擦磨损试验机对涂层物相、显微组织、力学性能及耐磨性能进行了研究。结果表明:熔覆层中无气孔、裂纹等缺陷,且基材与熔覆层之间呈现良好的冶金结合。涂层的显微组织主要由等轴组织、柱状组织和共晶组织构成。随着激光功率增加,涂层硬度与耐磨性均呈现出先增后减趋势。当激光功率为750 W时涂层显微硬度最高为621.1 HV,是基体硬度(157.8 HV)的4倍左右,其摩擦因数为0.467,磨损量和磨损率分别为0.0072 g与0.48×10^(-5)g/(m·N),此时涂层耐磨性能最佳。To investigate the impact of laser power on the microstructure and properties of Fe-based composite coatings,composite coatings were applied to the surface of Q345 steel using power levels of 690 W,750 W,810 W,and 870 W,with a scanning speed of 0.004 m/s.The phase composition,microstructure,mechanical properties and wear resistance of the coating were analyzed using metallographic microscopy,scanning electron microscopy,X-ray diffraction,Vickers microhardness testing and friction and wear testing.The results indicate that the cladding layer is free from defects such as pores and cracks,and there exists a strong metallurgical bond between the substrate and the cladding layer.The microstructure of the coating primarily consists of equiaxed,columnar and eutectic structures.As the laser power increases,the hardness and wear resistance of the coating initially rise before declining.At a laser power of 750 W,the microhardness of the coating reaches 621.1 HV,which is about four times that of the substrate(157.8 HV).The friction coefficient is 0.467,with wear loss and wear rate measuring at 0.0072 g and 0.48×10^(-5)g/(m·N),respectively.At this time,the coating has the best wear resistance.

关 键 词：激光熔覆 铁基合金 显微组织 耐磨涂层 

分 类 号：TG174.44[金属学及工艺—金属表面处理]