摘要
采用额定功率为1 kW的光纤激光器对机场供油管网材料进行激光增材实验,通过光学显微镜、扫描电镜、硬度仪、能谱仪、X射线衍射仪、电化学工作站、摩擦磨损设备和霍普金森杆等研究了增材层的组织及性能。结果表明:激光功率的增加和激光增材的过程使预热和热积累的效果增强,导致熔化更多的金属粉末,使增材层厚度增加;当增材过程中预热以及热积累效果和散热换热等效果达到准稳态时,增材层的厚度将保持稳定。在激光功率为400、600和800 W时,增材层的平均显微硬度分别为317.88、275.62和208.53 HV0.3。当激光功率为400 W时,增材层的磨损率为基体磨损率的39%,展现出较好的耐磨损性能;当激光功率为600 W时,增材层的腐蚀电流为基体的腐蚀电流的58.6%,腐蚀电位正移66 mV,展现出了较好的耐腐蚀性能;当激光功率为800 W时,增材层的弹性模量为2.45×10^(11) Pa,是基体弹性模量的1.22倍,展现出了较好的刚度。
A fiber laser with a rated power of 1 kW was used to conduct laser additive experiments on airport oil supply pipe network materials. Microstructure and properties of the additive layer were studied by means of optical microscope, scanning electron microscopy, hardness tester, energy spectrometer, X-ray diffractometer, electrochemical workstation, friction and wear equipment and Hopkinson rod. The results show that the effect of preheating and heat accumulation is enhanced by the increase of laser power and the process of laser additive, which leads to more metal powder melting, and the thickness of the additive layer increases. When the preheating and heat accumulation effect and heat dissipation and heat exchange effects reach quasi-steady state in the process of laser additive, the thickness of the additive layer will remain stable. When the laser power is 400 W, 600 W, and 800 W, the average microhardness of the additive layer is 317.88 HV0.3, 275.62 HV0.3 and 208.53 HV0.3, respectively. When the laser power is 400 W, the wear rate of the additive layer is 39% of that of the matrix, showing good wear resistance. When the laser power is 600 W, the corrosion current of the additive layer is 58.6% of that of the substrate, and the corrosion potential is increased by 66 mV, showing good corrosion resistance. When the laser power is 800 W, the elastic modulus of the additive layer is 2.45×10^(11) Pa, which is 1.22 times of the matrix, showing good stiffness.
作者
浮艺旋
庞铭
FU Yi-xuan;PANG Ming(Department of Airport,Civil Aviation University of China,Tianjin 300300,China)
出处
《材料热处理学报》
EI
CAS
CSCD
北大核心
2021年第2期121-129,共9页
Transactions of Materials and Heat Treatment
基金
国家自然科学基金(U1633111,51206179)
中央高校基本科研业务费项目中国民航大学专项资助(3122018D020)
中国民航大学蓝天青年科研资金资助项目
中央高校基本科研业务费资助项目(201909)。
关键词
机场供油管网
增材制造
激光功率
耐腐蚀性
airport oil supply pipelines
additive manufacturing
laser power
corrosion resistance
