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›› 2008, Vol. 25 ›› Issue (2): 172-176.DOI: 10.7523/j.issn.2095-6134.2008.2.005

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Experimentalinvestigationandfiniteelementsimulationongrain refinementofcopperduetoshotpeening

LANJiaoXiaWANGZhiJiaHONGYouShi   

  • Received:1900-01-01 Revised:1900-01-01 Online:2008-03-15

Abstract: Abstract ShotPeening(SP)isatypicalsevereplasticdeformationmethodtoproduceultrafinegrainsofmetallic materials.Anexperimentalinvestigationiscarriedoutonpurecopperspecimensbymeansofashotpeening machinedrivenbyhighenergyairpressure,asurfaceroughnessmeasurmenttester,amicrohardnessindenter,an opticalmicroscopeandascanningelectronmicroscopeequippedwithelectricalbackscatterdiffractionapparatus.Theresultsshowedthatsurfaceroughnesstakesonanexponentialdecaywithdisposaltime,andthatthegrainsizeinthespecimenswith13333sis252micronscomparedwiththeoriginalvalueof2548microns,i.e.itis refinedbyoneorderofmagnitude.Themicrohardnesstestingonthespecimenshowedthehardnessincreasedfrom0.58GPato1.25GPaafterSPtreatment.Ontheotherhand,adimensionalanalysisisperformedtoexamineSP
processsothattoobtainfivedimensionlessparametersandthemethodoffiniteelementsimulationisusedtoanalyzetheeffectofdimensionlessparametersonsurfaceroughness.InordertofurtherunderstandSPprocess,weusedVB
towritethesubprogramfortherandomimpactsimulation,whichthenincorporatedwithfiniteelementcodeAnsys/ls-dynasoastosimulatethecollisionprocessbetweenballsandsample.Andsimulatedresultsandexperimental resultswerecomparedtoverifythefiniteelementmodel.

Key words: shotpeening, finiteelementsimulation, copper, dimensionalanalysis, severeplasticdeformation

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