Laser Additive Manufacturing And Performance Evaluation Of Airport Fuel Pipeline Network Materials

The oil supply network used in airports needs high reliability and long life in work.At present,the performance of the oil supply pipeline used in the airport has obvious deterioration.It is urgent to use new technologies to improve the safety of pipelines.The advantages of laser additive manufacturing include no need for molds,controllable molding accuracy,etc.This paper will carry out the research on laser additive manufacturing of airport fuel supply pipe network materials.Currently,the development of laser additive manufacturing process is limited.The technical bottleneck of laser additive manufacturing is the control of the performance and molding quality of laser additive parts.In order to break through the technical bottleneck,the author carried out the following research.First of all,the research on the effect of laser additive manufacturing on the performance of L290M pipeline steel was carried out.The research revealed the formation mechanism of defects such as porosity,non-fusion and inclusions in the additive layer during the laser additive manufacturing process,and proved the influence of laser power and scanning speed on the porosity of the additive layer.The experiment finally obtained the process parameters that make the additive layer have lower porosity,higher hardness and wear resistance.Secondly,to further improve the performance of the additive layer of laser additive manufacturing,the effect of the content of rare earth oxide Ce O₂ on the performance of laser additive manufacturing of L290M pipeline steel was carried out.The results show that with the increase of the content of rare earth oxide Ce O₂,the thickness of the additive layer decreases;with the increase of the content of rare earth oxide Ce O₂,the density of the eutectic structure of the additive layer first increases,then decreases and then increases.When the Ce O₂ content is 3%,the additive layer has higher hardness and better wear resistance;when the Ce O₂ content is 0.5%,the additive layer has better corrosion resistance.In order to further improve the erosion wear resistance and corrosion resistance of the laser additive layer,subsequently,an experimental study of laser additive L290M powder and Ni60 powder composite additive was carried out.It is found in experiments that reducing the laser scanning speed can inhibit the cracks of the additive layer.And there is an incoordination response between the wear resistance and corrosion resistance of the additive layer and the laser parameters.Then,the effect of rare earth oxide Ce O₂ content on the microscopic properties and performance of laser additive manufacturing L290M+Ni60composite material was studied.In the study,it was found that the appropriate rare earth oxide Ce O₂ can inhibit the formation of cracks in the composite additive layer.When the Ce O₂ content is 0.5%,the composite additive layer exhibits higher hardness and better corrosion resistance;when the Ce O₂ content is 1%,the composite additive layer exhibits better wear resistance.Finally,in order to reduce the cost of laser additive manufacturing,the effect of Ni,Cr,Si,B trace elements on the performance of composite additive layers was explored.The results show that when the L290M powder contains 3%Ni,10%Cr,2%Si and 0.5%B,no cracks occur on the surface of the additive layer,and the additive layer has higher hardness,better wear resistance and Corrosion resistance.