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1、45钢SiC粉激光表面熔覆层的组织与性能研究45钢SiC粉激光表面熔覆层的组织与性能研究摘要：本课题的主要目的是研究45钢表面激光熔覆SiC-Ti涂层，熔覆后组织与性能的变化。其中以功率的改变对熔覆组织的影响为研究重点。本课题研究结果对于改善材料的性能提供了良好的理论基础，同时为利用廉价金属来满足更高性能的要求，从而降低原材料成本具有重要的实际意义。本课题实验材料是45钢、SiC粉和Ti粉。先将SiC粉和Ti粉混合制备好熔覆层涂在基体表面，然后在不同的激光功率下进行激光熔覆实验，最后进行金相观察熔覆后组
2、织。熔覆后的组织分为熔覆层、过渡层和基体组织，随着激光功率的增加，熔覆层和过渡层的宽度逐渐增加。相对于激光功率为1.4Kw和1.8Kw，激光功率为1.6Kw时，熔覆组织中未熔的SiC颗粒和柱状晶较少，得到较好的熔覆组织。10关键词：激光熔覆；激光功率；45钢；SiC+Ti粉；显微组织IStudyofthepropertiesandmicrostructureon45SiCpowderlasercladdingofsteelZhangXiaoSupervisor：XiaoYahang(BaojiUnive
3、rsityofArtsandSciences,DepartmentofElectricalandMechanicalEngineering,Materialsformingandcontrolengineering,ShaanxiBaoji,721016)Abstract:Themainpurposeofthisprojectistostudy45steelsurfaceoflasercladdingSiC-Tiaftercoating,claddingmicrostructureandproperti
4、esofchange.Amongthemwiththepowertochangetheinfluenceofthecladdingorganizationfortheresearchfocus.Thistopicresearchresultstoimprovethepropertiesofmaterialsprovidedatheoreticalfoundation,atthesametimetotakeadvantageofcheapmetaltomeethigherperformancerequir
5、ements,thus10reducerawmaterialcosthasimportantpracticalsignificance.Thistopicexperimentmaterialis45steel,SiCpowderandTipowder.FirstwillSiCpowderandTipowdermixturepreparationgoodcladdinglayercoatedinthesurfaceofthematrix,andtheninthelaserpowerunderdiffere
6、ntlasercladdingexperiment,finallyaftermetalloscopeobservationcladdingorganization.Theorganizationisdividedintocladdinglayercladdinglayer,thetransitionmatrixorganization,aswiththeincreaseofthelaserpower,claddinglayerandthewidthofthetransitionlayersincreas
7、egradually.Relativetothelaserpowerof1.4Kwand1.8Kw,laserpoweris1.6Kw,thecladdingorganizationofSiCparticlesandnotmeltlesscolumnarcrystal,getbettercladdingorganization.Keywords:lasercladding;Laserpower;45steel;SiC+Tipowder;microstructureII目录101前言...........
8、..................................................................................................................11.1金属材料表面熔融强化技术的研究现状.......................................................11.1.1金属材料表面堆焊强化技术的研究现状.........
