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UsingMAGMAstressCommittedtoCastingExcellenceHotTearingHotTearing–What'sThat?¬Hottearsareintercrystallinematerialseparationsduringsolidificationthatoccurattemperaturesjustabovesolidustemperature¬ColdcracksoccurbelowsolidustemperatureTypicalLocationsofHotTears¬HottearsoccurwheretwosolidificationfrontsapproacheachotherTypicalLocationsofHotTearsCausesforHotTears¬Solidificationshrinkage¬Brittlematerialbehavior¬Contractionofalreadysolidifiedregions¬Contractionhindrance(obstacle)bymoldingsandMaterialBehaviorintheSolidificationInterval(1)=elongationatrupture(2)=thermalcontractionTS=solidustemperatureT1=lowertemperaturelimitofthebrittlezoneT2=uppertemperaturelimitofthebrittlezoneTt=transitiontemperature,startofthermalcontractionTL=liquidustemperatureStrain(1)(2)TST1T2TtTLTemperatureInfluencingFactors¬Castingdesign¬Castingprocess¬Pouringtemperature¬Moldmaterial¬CastalloyWhatareweSimulating?¬Whenacastingcools,itcontractsandthermalstressesdevelop.Thethermalstressesalone,however,arenotacauseforthedevelopmentofhottears.¬Criticalquantitiesare:¬Highstrainrates¬Lowcoolingrates¬HighstrainsToBeConsidered:¬Hottearsoccurduringsolidification.Thisiswhyweonlyneedtoobservethecastinguntiltheendofsolidification¬PayattentiontowritealargenumberofresultsduringsolidificationsimulationToBeConsidered:¬Stressesandstrainsdevelopassoonasthecastingstartstosolidify¬Inthinregions,thishappensimmediatelyafterfilling¬StrainratesindicatehowfastlocalstrainsdevelopMaterialSelection¬Selectthematerials(casting,ingate,feeders,etc.)fortheMAGMAstresssimulationIncrementDefinition¬SimulatesolidificationandusethefollowingsolidificationresultsasinputforMAGMAstress:¬percentsolid:Thisareaisespeciallyimportantfortheanalysisofhotteartendency.¬Resultsevery5%upto80%solidified¬every2%upto100%solidifiedResultSelection¬Activatethecalculationofthehottearcriterion–Thisway,youobtaintheresult(HotTear)foreachcalculatedinc
