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1、上海交通大学工学硕士学位论文AbstractLaserSurfaceTexturingandtheStudyofFrictionandWearPropertiesof304StainlessSteelAbstractIntroducingspecifictexturesonatribologicalsurfacecancontributetofrictionreductioninslidingcontacts.Lasersurfacetexturingisakindofefficientandcontrollablemethodforprodu
2、cingthetextureofmicro-pores.However,duetothehighintensityofthelaserbeampulse,surfaceareaincloseproximitytothedimplealsoundergoesmeltingandrapidre-solidification.Thiscollateraldamageofthesurfaceisunavoidablewhenusingahighpowerlasersurfaceprocessing,leadingtoanincreasedroughne
3、ssaroundtheholes.Sofar,however,littleattentionwaspaidtothebulgesaroundthedimplesrimandtheirinfluenceonthefrictionandwearbehavior,thustherearefewerstudiesonthat.Therefore,itiscrucialtoinvestigatetheeffectsofdifferentlaserparametersonthemorphologyandsizeofthemicro-poresandunde
4、rstandtheroleofbulgesinthetribologicalperformance.Theresearchstatus,developmenttrendandnumericalsimulationoflasersurfacetexturingtechniquesareintroducedinthispaper.Atthesametime,physicalphenomenainvolvedintheprocessanditsimpactonthemorphologyofthemicro-poresareanalysed.Furth
5、ermore,anumericalsimulationofpulsedlaserablationcrateraremodeledandverifiedexperimentallyverified.Thedetaiedresearchcontontsareasfollows:Firstly,thephysicalprincipleoflasersurfacetexturingisexplaineddetailedly.Effectsofrecoilpressure,surfacetension,andtheauxiliarygasondynami
6、csofmoltenmetalareanalyzed.Takingalltherelatedfactorsintoconsideration,asimulationmodelofpulsedlaserablationcraterof304stainlesssteelisbuiltbasedonthephysicalprinciple.Muchemphasisisplacedontheeffectsofpulsenumbersandpulseenergyonthemorphologyandsizeofthecrater.III万方数据上海交通大学
7、工学硕士学位论文AbstractTheexperimentoflasersurfacetexturingisconducted.Usingthecontrolvariablemethod,theeffectsofpulseenergy,pulsenumber,pulsefrequency,andauxiliarygasonthetopographyandsizerespectively.CombiningtheroleofrecoilpressurewiththeroleofsurfacetensionintheMarangoniflow,th
8、ereasonsforchangesinmorphologyandsizearedescribed.Andmachiningoptimizationo
