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1P68F汽油机球铁曲轴断裂分析.docx

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1P68F汽油机球铁曲轴断裂分析 1P68Fgasolineengineductileironcrankshaftfractureanalysis Abstract A1P68Fgasolineenginecrankshaftmadeofductileironunexpectedlyfracturedduringoperation.Inthispaper,thefracturemorphology,mechanicalproperties,andmicrostructureofthefailedcrankshaftwereextensivelyinvestigatedandanalyzedusingvarioustechniques,includingscanningelectronmicroscopy(SEM),opticalmicroscopy(OM),X-raydiffraction(XRD),andhardnesstesting.Theresultsshowedthatthefractureofthecrankshaftwascausedbyacombinationofseveralfactors,includingmaterialdefects,crackpropagation,andfatiguedamage.Thefindingsofthisstudyprovidevaluableinsightsforimprovingthedesign,production,andqualitycontrolofsimilarenginecomponents. Introduction Crankshaftsareimportantrotatingcomponentsofinternalcombustionenginesthatconvertthereciprocatingmotionofpistonsintorotarymotion.Theyareusuallymadeofcastironorforgedsteelwithcomplexshapesandhighmechanicalloads.However,thedurabilityandreliabilityofcrankshaftscanbeaffectedbyawiderangeoffactors,includingmaterialquality,manufacturingprocess,operatingconditions,andmaintenancepractices.Inthispaper,wereportacaseofunexpectedcrankshaftfractureina1P68Fgasolineengine,whichwasattributedtoacombinationofmaterialdefects,crackpropagation,andfatiguedamage. Experimentaldetails Afractured1P68Fgasolineenginecrankshaftmadeofductileironwasobtainedfromalocalrepairshop.Thecrankshafthadasingle-piecedesignwithfourrodjournals,amainjournal,andasnout.ThefracturedsectionwasexaminedusingSEMandOMtodeterminethefracturemorphology,crackinitiationsite,andcrackpropagationpath.XRDandhardnesstestingwerealsoconductedtoinvestigatethechemicalcompositionandmechanicalpropertiesofthefailedcrankshaft. Resultsanddiscussion SEMandOManalysisrevealedthatthefracturesurfaceofthecrankshaftwascharacterizedbyafibrouspatternofductilefracture,whichindicatedthatthecrackhadpropagatedslowlyundercyclicbendingandtorsionloads.Thefracturesurfacealsoexhibitedarelativelysmoothareanearthecenteroftheshaft,whichsuggestedthatthecrackwasinitiated