摘要
为探究激光熔覆再制造修复工艺对盾构机密封跑道磨痕的修复效果,采用送粉式激光熔覆工艺在42CrMo钢基体表面制备了Fe55铁基自熔合金涂层。基于L_(16)(4^(3))正交试验探究了激光功率、熔覆速率和搭接率对涂层表面形貌、横截面特征参数、稀释率、显微组织、硬度的影响规律和作用机理。极差分析表明,稀释率随激光功率和熔覆速率的增加均呈上升趋势,其中激光功率对涂层硬度影响最大,最大涂层硬度约为基体硬度的2.15倍。Fe55涂层的摩擦因数较基体明显降低,涂层耐磨性优良,其磨损体积较基体降低1.09×10^(-2)mm^(3),主要磨损机制为磨粒磨损和疲劳磨损。
To explore the effect of laser cladding remanufacturing on repair of the wear scar of the shield machine sealing runway, the Fe-based self-fusible alloy coating(Fe55) was prepared on 42 CrMo steel substrate by powder feeding laser cladding process. Based on the L_(16)(4^(3)) orthogonal experiment, the effects of laser power, cladding rate and over lap rate on surface morphology, cross section characteristic parameters, dilution rate, microstructure and hardness of the coating were investigated. The results of range analysis show that the dilution rate increases with the increase of laser power and cladding rate, among which the laser power has the greatest influence on coating hardness, and the maximum coating hardness is about 2.16 times of the matrix hardness. Fe-based coating can significantly reduce the friction coefficient of the matrix and has excellent wear resistance. Its wear volume is 1.09×10^(-2)mm^(3) lower than that of the matrix. The main wear mechanism is abrasive wear and fatigue wear.
作者
卢庆亮
王静
戚小霞
李燕乐
李方义
Lu Qingliang;Wang Jing;Qi Xiaoxia;Li Yanle;Li Fangyi(Jinan Heavy Industries Group Co.,Ltd.,Jinan Shandong 250109,China;Key Laboratory of Efficient and Clean Machinery Manufacturing,Minsitry of Education,School of Mechanical Engineering,Shandong University,Jinan Shandong 250061,China)
出处
《金属热处理》
CAS
CSCD
北大核心
2022年第1期202-211,共10页
Heat Treatment of Metals
基金
山东省重大科技创新工程项目(2019JZZY010428)。
关键词
激光熔覆
密封跑道
再制造修复
正交试验
稀释率
耐磨性
laser cladding
sealing runway
remanufactureing repair
orthogonal experiment
dilution rate
wear resistance
作者简介
卢庆亮(1979-),男,博士,主要研究方向为材料加工工程,E-mail:13853145318@139.com。
