摘要
采用不同激光功率(1000,1200,1400,1600,1800 W)在42CrMo钢表面激光熔覆锡青铜粉末制备铜-铁复合偏晶合金熔覆层,研究了激光功率对熔覆层显微组织、硬度和摩擦磨损性能的影响。结果表明:不同激光功率下,熔覆层与42CrMo钢基体均产生良好的冶金结合,熔覆层组织由铁相和铜相混合构成;随着激光功率增加,熔覆层内铁相含量增加,铜相含量减少,组织由以富铜相为主夹杂“散球状”富铁相转变为以富铁相为主夹杂“板条状”富铜相;随着激光功率增加,熔覆层显微硬度和摩擦因数增大,主要磨损机制由磨粒磨损转向黏着磨损,当激光功率为1200 W时,熔覆层硬度适中,摩擦因数显著低于基体,磨损质量损失最小,磨损表面平整,元素分布均匀,未发生明显局部氧化,综合摩擦磨损性能最优。
Cu-Fe composite monotectic alloy cladding layers were prepared on surface of 42CrMo steel by laser cladding tin bronze powder at different laser powers(1000,1200,1400,1600,1800 W).The effects of laser power on the microstructure,hardness and friction and wear properties of the cladding layers were studied.The results show that under different laser powers,the cladding layer and the 42CrMo steel substrate had good metallurgical bonding.The structure of the cladding layer was composed of the mixture of Fe and Cu phases.With the increase of laser power,the content of Fe phase in the cladding layer increased,while that of Cu phase decreased.The microstructure changed from mainly consisting Cu-rich phase and mixing with"dispersed spherical"Fe-rich phase to mainly consisting of Fe-rich phase and mixing with"plate-like"Cu-rich phase.With the increase of laser power,the microhardness and the friction coefficient of the cladding layer increased.The main wear mechanism changed from abrasive wear to adhesive wear.When the laser power was 1200 W,the hardness of the cladding layer was moderate,the friction coefficient was significantly lower than that of the substrate,the wear mass loss was the smallest,the wear surface was flat,the element distribution was uniform,and no significant local oxidation was observed;the comprehensive friction and wear property was the best.
作者
陈占威
罗善明
黄瀚林
吴明杰
CHEN Zhanwei;LUO Shanming;HUANG Hanlin;WU Mingjie(College of Marine Equipment and Mechanical Engineering,Jimei University,Xiamen 361021,China)
出处
《机械工程材料》
北大核心
2025年第7期103-110,共8页
Materials For Mechanical Engineering
基金
高性能齿轮激光熔覆成形机理及性能调控机制研究基金资助项目(52375055)。
关键词
激光熔覆
显微组织
物相
显微硬度
摩擦磨损性能
laser cladding
microstructure
phase
microhardness
friction and wear property
作者简介
陈占威(1995-),男,河北唐山人,硕士研究生;通信作者:罗善明,教授,导师。
