真空熔結(jié)稀土鎳基合金涂層組織性能及界面分形研究.pdf

1、分類號：—TGl—74445密級：——單位代碼：】Q墨墨2學號：!塑!型!!塑93侖肥工學火警HefeiUniversityofTechnology碩士學位論文∥鷹弋④論文題目：真空熔結(jié)稀土鎳基合金涂層組織性能學位類別：學科專業(yè)：(工程領(lǐng)域作者姓名：導師姓名：完成時間：及界面分形研究學歷碩士材料學琚正挺宣天鵬教授2007年3月Thefraetalresearchoftheinterfaceandthemicrostructureprop

2、ertiesoftheVacuumFusionSinteringNickel—basealloycoatingwithRareEarthJoinedAbstractTheinterfacepropertyofthevacuumfusionsinteringNi—basealloycoatinghasbeenresearchedbythefractalmethodThroughthefractalanalysistothealloycoa

3、tinginterfacemorphologytherelationshipbetweenthemicrohardness、diffusioncoefficient、thermalfatiguepropertyandthefractalhasbeenconstructedTheNibaseREalloycoatingandNibaseWCcompositecoatingwereobtainedbythetechniqueofvacuum

4、fusionsinteringonthe45steelTheinterfacemorphologyandthemicro—structuresymbolofthesectionwereanalysisedwiththemethodofSEMAlsothemicro—hardnessdestructionvaluesinthetwosidesoftheverticalsectionweremeasuredbythemicrosclerom

5、eterThevalueswereanalysisedUsetheEDS，thecontentsofthecertainelementinthetwosidesofthecoatingweremeasuredthenthediffusioncoemcientcalculationequationwasdeducedwhichcouldcalculatetheelementdiffusioncoefficientvalueinthecer

6、taindepthTothethermalfatiguepropertythereweresomeanalysisinthispaperTheinterfaceandsurfaceofthecoatingarenonlinear’belongtandomfractal，alsothegeometricalshapewiththecertainfractaldimensionDifferentcoatingshavedifferentin

7、terfacemorphologythefractaldimensionofthecertaincoatingverticalsectionwiththefractalwascalculatedForthefractaldimensionshowthe“randomdegree”ofthefractalgraph，thecertainfractaldimensionvaluecorrespondsthecertainalloycoati

8、ngInthispaper，thepreparationmaterialswerevacuumfusionsinteringNiCrBSiREalloycoatingwhichthedifferentcontentandsortwereaddedandthecompositecoatingwithdifferentWCcontentTherelationshipbetweenthefractaldimensionofthecoating

9、verticalsectionandthedistributionofthemicrohardness、thermalfatigueproperty、microstructureThentheaimthatthefractaldimensionsymbolizethecoatingmacropropertywasgottenwhichwouldtakeanewmethodtothematerialanalysisAccordingtot

10、heresearchresult，thefractaldimensionvaluescorrespondtothedifierentmicrostructure、themicrohardnessdistributionvalue、thethermalfatiguepropertyGenerallythefractaldimensionsofthealloycoatingswithREarelargerthantheonesoftheal