摘要
采用激光熔覆技术制备了激光扫描速度为10、12、14、16 mm/s的M2高速钢涂层。研究了不同扫描速度对M2涂层物相成分、微观组织、显微硬度和摩擦磨损性能的影响及机理。结果表明,不同扫描速度下涂层均未出现裂纹,涂层微观组织主要由柱状晶、胞状晶和等轴晶组成。随着激光扫描速度的增加,涂层晶粒细化。激光涂层约5μm的晶粒尺寸远小于通过传统方法获得的晶粒尺寸(约100μm)。随着扫描速度的增加,涂层中的碳化物含量先增大后减小,涂层的显微硬度先升高后降低,激光扫描速度为14 mm/s时,显微硬度最大为787.07 HV0.2,高于传统铸造高速钢(580~620 HV0.2)。随着扫描速度的增加,涂层的磨损率先减少后增加,激光扫描速度为14 mm/s时,涂层的磨损率最低为0.203×10^(-3)mg/m。
M2 high-speed steel coatings with laser scanning speeds of 10 mm/s,12 mm/s,14 mm/s and 16 mm/s were successfully fabricated by laser cladding.The effects and mechanism of different scanning speeds on the phase composition,microstructure,microhardness and friction and wear properties of M2 coatings were analyzed and studied.The results show that no cracks appear in the coatings under different scanning speeds,and the microstructures of the coatings are mainly composed of columnar crystals,cellular crystals and equiaxed crystals at different scanning speeds.As the laser scanning speed increases,the coating grains are refined.The grain size of the laser coating of about 5μm is much smaller than that obtained by conventional methods(about 100μm).With the increase of the laser scanning speed,the carbide content in the coating first increases and then decreases,and the microhardness of the coating first increases and then decreases.When the laser scanning speed is 14 mm/s,the maximum microhardness is 787.07 HV0.2,higher than traditional cast high-speed steel(580-620 HV0.2).With the increase of the scanning speed,the wear rate of the coating decreases first and then increases.When the laser scanning speed is 14 mm/s,the lowest wear rate of the coating is 0.203×10^(-3) mg/m.
作者
王涛
朱磊
陈思宇
王浩
张莹
WANG Tao;ZHU Lei;CHEN Siyu;WANG Hao;ZHANG Ying(Civ il Aviation Laser Manufacturing Technology Institute,Civil Aviation University of China,Tianjin 300300,China;College of Aeronautical Engineering,Civil Aviation University of China,Tianjin 300300,China;Engineering Technology Training Center,Civil Aviation University of China,Tianjin 300300,China)
出处
《热加工工艺》
北大核心
2023年第20期81-86,共6页
Hot Working Technology
基金
国家自然科学基金项目(52172360)
中国民航大学科技项目(3122022PT07)。
关键词
激光熔覆
M2高速钢
显微硬度
摩擦磨损性能
laser cladding
M2 high-speed steel
mi-crohardness
friction and wear properties
