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1、45鋼SiC粉激光表面熔覆層的組織與性能研究45鋼SiC粉激光表面熔覆層的組織與性能研究摘要：本課題的主要目的是研究45鋼表面激光熔覆SiC-Ti涂層，熔覆后組織與性能的變化。其中以功率的改變對(duì)熔覆組織的影響為研究重點(diǎn)。本課題研究結(jié)果對(duì)于改善材料的性能提供了良好的理論基礎(chǔ)，同時(shí)為利用廉價(jià)金屬來滿足更高性能的要求，從而降低原材料成本具有重要的實(shí)際意義。本課題實(shí)驗(yàn)材料是45鋼、SiC粉和Ti粉。先將SiC粉和Ti粉混合制備好熔覆層涂在基體表面，然后在不同的激光功率下進(jìn)行激光熔覆實(shí)驗(yàn)，最后進(jìn)行金相觀察熔覆后組織
2、。熔覆后的組織分為熔覆層、過渡層和基體組織，隨著激光功率的增加，熔覆層和過渡層的寬度逐漸增加。相對(duì)于激光功率為1.4Kw和1.8Kw，激光功率為1.6Kw時(shí)，熔覆組織中未熔的SiC顆粒和柱狀晶較少，得到較好的熔覆組織。10關(guān)鍵詞：激光熔覆；激光功率；45鋼；SiC+Ti粉；顯微組織IStudyofthepropertiesandmicrostructureon45SiCpowderlasercladdingofsteelZhangXiaoSupervisor：XiaoYahang(BaojiUnivers
3、ityofArtsandSciences,DepartmentofElectricalandMechanicalEngineering,Materialsformingandcontrolengineering,ShaanxiBaoji,721016)Abstract:Themainpurposeofthisprojectistostudy45steelsurfaceoflasercladdingSiC-Tiaftercoating,claddingmicrostructureandpropertieso
4、fchange.Amongthemwiththepowertochangetheinfluenceofthecladdingorganizationfortheresearchfocus.Thistopicresearchresultstoimprovethepropertiesofmaterialsprovidedatheoreticalfoundation,atthesametimetotakeadvantageofcheapmetaltomeethigherperformancerequiremen
5、ts,thus10reducerawmaterialcosthasimportantpracticalsignificance.Thistopicexperimentmaterialis45steel,SiCpowderandTipowder.FirstwillSiCpowderandTipowdermixturepreparationgoodcladdinglayercoatedinthesurfaceofthematrix,andtheninthelaserpowerunderdifferentlas
6、ercladdingexperiment,finallyaftermetalloscopeobservationcladdingorganization.Theorganizationisdividedintocladdinglayercladdinglayer,thetransitionmatrixorganization,aswiththeincreaseofthelaserpower,claddinglayerandthewidthofthetransitionlayersincreasegradu
7、ally.Relativetothelaserpowerof1.4Kwand1.8Kw,laserpoweris1.6Kw,thecladdingorganizationofSiCparticlesandnotmeltlesscolumnarcrystal,getbettercladdingorganization.Keywords:lasercladding;Laserpower;45steel;SiC+Tipowder;microstructureII目錄101前言..................
8、...........................................................................................................11.1金屬材料表面熔融強(qiáng)化技術(shù)的研究現(xiàn)狀.......................................................11.1.1金屬材料表面堆焊強(qiáng)化技術(shù)的研究現(xiàn)狀.........
