摘要
使用高速激光熔覆技术在NiCr15Fe合金表面制备NiCoCr涂层,研究了不同激光功率和扫描速度对该涂层宏观形貌的影响。使用SEM、XRD和显微硬度仪,对该涂层的微观组织、成分及硬度进行了检测分析。结果表明,涂层的宽度和稀释率随着激光功率的增加而增加,而随着扫描速度的增加而减小。涂层可分为细晶区、等轴晶和柱状晶的混合区以及柱状晶区。在涂层与基体之间生成了σ相(FeCr)白亮带。随激光功率增加,硬度先减小后增加,其中当激光功率为1.9 kW时,涂层硬度达最高值286.6 HV。随扫描速度增加,硬度也呈先减小后增加的规律,当扫描速度为120mm/s时,涂层硬度达最高值321.9 HV。
NiCoCr layer were prepared on the surface of NiCr15Fe alloy using high-speed laser cladding technology,and the effects of different laser powers and scanning speeds on the macroscopic morphology and dilution rate of the layer were investigated.The microstructure,composition distribution,and hardness of the layers were characterized and analyzed using SEM,XRD and microhardness tester.The results show that the width and dilution rate of the layers increase with the increase of laser power,and decrease with the increase of scanning speed.The layers can be divided into fine grain zone,equiaxed crystal and columnar crystal mixed zone,and columnar crystal zone.A bright band consisting ofσ(FeCr)phase is formed between the layer and the substrate.With the increase of laser power,the microhardness initially decrease and then increase,with the maximum microhardness reaching 286.6 HV when the laser power is set to 1.9 kW.With the increase of scanning speed,the microhardness also show a similar trend of first decreasing and then increasing,achieving the highest microhardness of 321.9 HV when the scanning speed is 120 mm/s.
作者
吴孝泉
张道达
黄飞腾
周洪波
李骏业
彭红军
WU Xiaoquan;ZHANG Daoda;HUANG Feiteng;ZHOU Hongbo;LI Junye;PENG Hongjun(Jiangxi Institute of Mechanical Science,Nanchang 330002,China;Key Laboratory of Die Surface Treatment&Manufacturing Technology in Nanchang,Nanchang 330095,China;Department of Mechanical Engineering,Jiangxi Technical College of Manufacturing,Nanchang 330095,China;Jiangxi Reman Additive Technology Co.,Ltd.,Nanchang 330098,China)
出处
《热加工工艺》
北大核心
2025年第13期73-78,共6页
Hot Working Technology
基金
江西省教育厅科学技术计划项目(GJJ2207504,GJJ2207510,GJJ214701)
江西省科技厅重点研发计划项目(20212BBE53044)
江西省学科带头人培养计划项目(2024)。
关键词
高速熔覆
镍合金
稀释率
显微硬度
high-speed cladding
nickel alloy
dilution rate
microhardness
