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1、InternationalJournalofFatigue24(2002)19www.elsevier.com/locate/ijfatigueCastingdefectsandfatiguestrengthofadiecastaluminiumalloy:acomparisonbetweenstandardspecimensandproductioncomponents*M.Avalle,G.Belingardi,M.P.Cavatorta,R.DoglioneDepartmentofMechanicalEngineering,Politec
2、nicodiTorino,CorsoDucadegliAbruzzi24,10129Torino,ItalyReceived9April2001;receivedinrevisedform26July2001;accepted31July2001AbstractTheinfluenceofcastingdefectsonstaticandfatiguestrengthisinvestigatedforahighpressurediecastaluminiumalloy.Defectsexistingasandshrinkageporesaswel
3、lascoldfills,drossandaluminaskins.Forthethreebatchesofspecimens,differingforthespruerunnerdesign,theinfluencewasstraightforward,whilenosignificantvariationinthefatiguestrengthwasobservedwhenlookingatbatchesofacceptableandnon-acceptablecomponents,asjudgedwithinthefoundryqualityc
4、ontrol.Inthiscase,defectscountfortheirsizeandlocation,whilequalitycontroloftentakesnoaccountforcomponentworkingconditions.TheHaighdiagramshowsagoodmatchingbetweenthespecimenreferencematerialandthecomponentfatiguedata.Ó2001ElsevierScienceLtd.Allrightsreserved.Keywords:Diecast
5、ing;Porosity;Castingdefects;Fatigue;Aluminium1.IntroductionerallyacknowledgedthatthefatiguestrengthofmaterialscontainingdefectsislowerthanthatofadefectHighpressurediecastingiswidelyusedforthepossi-freematerial.Itisalsogenerallyacceptedthatfatiguebilityofobtainingnettoshapeco
6、mponentsofcomplexlifeisdeterminednotonlybythesizeofthedefectbutgeometryathighproductionrates.Adisadvantageofthealsobyitsdistancefromafreesurface[9,10].Recenttechnologyisthealmostinevitablepresenceofshrinkagedataalsoshowedtheimportanceofthedistributionandcavities,oftencoupled
7、withotherdefects:coldfills,alu-morphologyofphasesinthemicrostructure.InRef.[11],minaskins,dross,entrappedairbubbles[1].Theinflu-fatiguestrengthisobservedtovarywithsolidificationenceofcastingdefectsonthematerialpropertiesofcastparametersandhencelocationinthecasting.aluminiumallo
8、yshasbeeninvestigatedbyanumberofHowever,resultsreportedintheliteratureareal
