443铁素体不锈钢表面飞秒激光微%2f纳米结构化的研究

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1、万方数据太原理工大学硕士研究生学位论文443stainlesssteelwasdiscussed．2．Linkednanostructure·texturedmound-shapedmicrostructures(termedN-mounds)wereinducedbyfslaseron443stainlesssteelsurfaceinairviamultiplerasterscans．TheformationmechanismofthelinkedN—moundsisdiscussed．WithincreasingnumberofrasterSCanS，fourstagesof

2、thelinkedN—mounds’formationareidentified，thatiS，theformationoffslaser-inducedperiodicsurfacestructures，thegenerationofprecursorprotrusionsontheFLIPSSs，thedevelopmentofrandomN—mounds，theformationoflinkedN—mounds．ThegrowthofN—moundsandtheformationoflinkedN—moundsarealsoattributedtopreferentialab

3、lationofvalleysbetweenN—mounds．3．443stainlesssteelwasablatedbyfslaserviamulti—scansinair，waterandmethanolusingsamelaserprocessingparameters．111eformationmechanismsoffs1aser．inducedsurfacemicro／nanostructuresinwaterandmethanolwerediscussed．Inwater，fslaserinducedperiodicsurfacestructureswereform

4、edandtheirformationCanbeexplainedbytheinterferencebetweenincidentlaserandsurfaceplasmapolaritons．Inmethanol，withtheincreaseofscanningnumber,ripples—texturedmicroprotrusionsformed，whichwastheresultofmulti—ablationevolutionandcausedbyinhomogeneousabsorbedlaserintensitydistributionduetothediffrac

5、tionofsurfaceroughness．Thedifferenceinsurfacemorphologyobminedindifferentenvironmentalmediawascausedbythedifferenceinphysiochemicalpropertiesbetweenenvironmentalmedia．4．Theinfluenceofenvironmentalmediaonablationrateof443stainlesssteelunderfslasersinglerasterscanandmultiplerasterscansinair，wate

6、r，andmethanolwasinvestigated．Meanwhile，thedevelopmentofablationratewiththechangeoffslaser—inducedsurfacemorphologyinthethreeenvironmentalmediaiscomparativelystudied．Theresultsshowthatenvironmentalmediaaswellasfslaser—inducedmorphologycontroltheablationratewiththeincreasingnumberofrasterscans．U

7、ndersinglerasterscanning，theablationrateishigherinliquidthaninairduetOtheconfinementofplasma，laser—inducedshockwaves，andbubble-relatedmechanicalforces．However，undermultiplerasterscans，thevariationinablationratewiththeincreasingnumberofr