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外文翻译--半固态铝合金(A356)浆料流变成形的充填性能 英文版.pdf

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外文翻译--半固态铝合金(A356)浆料流变成形的充填性能 英文版.pdf

JOURNALOFUNIVERSITYOFSCIENCEANDTECHNOLOGYBEQINGVOLUME15,NUMBER7,FEBRUARY2008,PAGE48ELSEVIERFILLINGABILITYOFSEMISOLIDA356ALUMINUMALLOYSLURRYINRHEODIECASTINGYUELONGBAIL’’,WEIMINMAO‘’,SONGAO”,GUOXINGTANG”,ANDJUNXU’’1SCHOOLOFMATERIALSSCIENCEANDENGINEERINGUNIVERSITYOFSCIENCEANDTECHNOLOGYBEIJING,BEIJING100083CHINA2NATIONALENGINEERINGRESEARCHCENTERFORNANFERROUSMETALSCOMPOSITEGENERALRESEARCHINSTITUTEFORNONFERROUSMETALS,BEIJING100088,CHINARECEIVED20070228ABSTRACTSTHEEFFECTSOFSLURRYTEMPERATURE,INJECTIONPRESSURE,ANDPISTONVELOCITYONTHERHEOFILLINGABILITYOFSEMISOLIDA356ALLOYSWERESTUDIEDBYTHEREHODIECASTINGMETHODSTHERESULTSSHOWTHATTHESLUNYTEMPERATUREOFTHESEMISOLIDA356ALUMINUMALLOYHASANIMPORTANTEFFECTONTHEFILLINGABILITY;THEHIGHERTHESLURRYTEMPERATURE,THEBETTERISTHEFILLINGABILITY,ANDTHEAPPROPRIATESLURRYTEMPERATUREFORRHEOFILLINGISINTHERANGEOF585595CTHEINJECTIONPRESSUREALSOHASAGREATEFFECTONTHEFILLINGABILITY,ANDITISAPPROPRIATETOTHERHEOFININGWHENTHEINJECTIONPRESSUREISINTHERANGEOF1525MPATHEPISTORVELOCITYALSOHASAGREATEFFECTONTHEFILLINGABILITY,ANDITISAPPROPRIATETOTHERHEOFILLINGWHENTHEPISTONVELOCITYISINTHERANGEOF0072012DSTHEFILLINGABILITYOFTHESLURRYPREPAREDBYLOWSUPERHEATPOURINGWITHWEAKELECTROMAGNETICSTIRRINGISVERYGOODANDTHEMICROSTRUCTURALDISTRIBUTIONINTHERHEOFORMEDDIECASTINGSISHOMOGENEOUS,WHICHISADVANTAGEOUSTOTHEHIGHQUALITYDIECASTING02008UNIVERSITYOFSCIENCEANDTECHNOLOGYBEIJINGALLRIGHTSRESERVEDKEYWORDSA356ALUMINURNALLOY;RHEODIECASTING;FILLINGABILITY;SEMISOLIDTHEWORKWASFINANCIALLYSUPPORTEDBYTHENATIONALNATURESCIENCEFOUNDATIONOFCHINUNO50774007,THENATIONALHIGHTECHNOLOGYRESEARCHANDDEVELOPMEN1PROGRAMOFCHINAN02006AA03Z115ANDTHENATIONALKEYBASICRESEARCHPROGRAMOFCHINAN02006CB605203I1INTRODUCTIONEVERSINCESEMISOLIDMETALFORMINGWASDEVELOPEDBYFLEMINGSATMITINTHE1970SITHASATTRACTEDCONSIDERABLEATTENTIONINOVERSEASANDDOMESTICSEVERALEXPERTSHAVEPARTICIPATEDINTHEBASICANDAPPLIEDRESEARCHOFTHESETECHNIQUESAFTERDEVELOPINGFOROVERTHIRTYYEARS,THESEHAVESUCCESSFULLYBEENAPPLIEDTOMANUFACTURINGVARIOUSKINDSOFCARANDAIRCRAFTPARTS131HOWEVER,ATPRESENT,ONLYTHETHIXOFORMINGTECHNIQUESHAVEBEENUSEDFORCOMMERCIALPRODUCTIONANDTHECOMMERCIALPRODUCTIONSCALEISSMALLYETTHISISMAINLYBECAUSETHEPREPARINGCOSTOFSEMISOLIDSLUNYANDTHEENERGYCONSUMPTIONOFBILLETREHEATINGAREHIGHER,ANDTHERECYCLINGOFBLEEDINGDROPS,BISCUITS,GATINGSYSTEM,ANDREJECTEDCASTINGSAREDIFFICULTWHENCOMPAREDWITHTHIXOFORMINGTECHNOLOGIES,REHOFORMINGTECHNIQUESOFSEMISOLIDMETALSHAVESEVERALADVANTAGES,SUCHASCONSIDERABLYSHORTERPROCESS,EASYRECYCLINGOFTHEGATINGSYSTEMANDWASTECORRESPONDINGAUTHORYUELONGBAIEMAILBALYUELONG163COM02IH8UNIVERSITYOFSCIENCEANDLECHNOLOPYBEIJINGALLRIGHTSRESERVEDCASTINGS,LOWPRODUCTIONCOST,ETCTHUS,REHOFORMINGTECHNIQUESARENOWBECOMINGONEOFTHEMOSTIMPORTANTSTUDYSUBJECTS491LOWSUPERHEATPOURINGWITHWEAKELECTROMAGNETICSTIRRINGFORASHORTTIMELSPWESISANEWMETHODFORTHEPREPARATIONOFSEMISOLIDALLOYSSLURRIES10111,WHICHREQUIRESLOWENERGYCONSUMPTIONASCOMPAREDWITHTHEPREPARATIONOFSEMISOLIDALLOYSBILLETSUSINGONLYELECTROMAGNETICSTIRRINGATAHIGHPOWER12131;ANDTHEPROCESSCONTROLISCONSIDERABLYCONVENIENT141ANDTHESLURRYMICROSTRUCTUREISBETTERTHANTHATPREPAREDBYTHELIQUIDUSCASTINGTECHNOLOGYTHEREFORE,LSPWESCANBEAPPLIEDASTHEKEYTECHNOLOGYOFANEWSEMISOLIDREHOFORMINGPROCESS15INTHISSTUDY,THEFILLINGABILITYOFSEMISOLIDA356ALLOYSLURRYPREPAREDBYTHELSPWESMETHODWASINVESTIGATEDANDTHEEXPERIMENTALRESULTSCANBEUSEFULFORTHEDEVELOPMENTOFANADVANCEDREHOFORMINGTECHNOLOGY2EXPERIMENTALTHERAWMATERIALSUSEDINTHEEXPERIMENTSWEREALSOAVAILABLEONLINEATWWWSCIENCEDIRECTCOMYLBAIEFAL,FILLINGABILITYOFSEMISOLIDA356ALUMINUMALLOYSLURRYINRHEODIECASTING49COMMERCIALA356ALUMINUMALLOYITSCOMPOSITIONWASSI,749WT;MG,046WT;FE,016WT;ANDBALANCEALTHELIQUIDSTEMPERATUREANDTHESOLIDSTEMPERATUREAREABOUT615AND555OC,RESPECTIVELYINTHEEXPERIMENTS,THESLURRYOFA356ALLOYWASFIRSTPREPAREDBYLOWSUPERHEATPOURINGWITHWEAKELECTROMAGNETICSTIMNG,ANDTHENTHESLURRYWASSOAKEDINANINDUCTIONHEATERAFTERTHESOAKINGPROCESS,THESLURRYWASFINALLYDELIVEREDQUICKLYINTOTHEINJECTIONCHAMBEROFTHEDIECASTINGMACHINEANDFORMEDTOINVESTIGATETHERHEODIECASTINGFILLINGABILITYOFTHEABOVEPREPAREDSLURRY,THEDIEWITHA1300MMX10MMX3MMSPIRALCAVITYWASUSEDTHESCHEMATICDIAGRAMANDCROSSSECTIONOFTHEDIEISSHOWNINFIGLTHERHEOFORMEDSPIRALSAMPLELENGTHMAYBEUSEDASTHESTANDARDTOEVALUATETHEEFFECTSOFSLURRYTEMPERATURE,INJECTIONPRESSURE,ANDPISTONVELOCITYONTHEFILLINGABILITYTHESLURRYTEMPERATURESUSEDINTHESEEXPERIMENTSWEREINTHERANGEOF585595C,THEINJECTIONPRESSURESWEREINTHERANGEOF525MPA,ANDTHEPISTONVELOCITIESWEREBETWEEN0024AND0072DSTHEPREHEATEDDIEANDTHEINJECTIONCHAMBERTEMPERATUREWERE120AND300OC,RESPECTIVELYFIG1SCHEMATICDIAGRAMOFTHEDIEAANDITSCROSSSECTIONBUNITMMTHEMETALLOGRAPHICSPECIMENSWERECUTFROMTHEDIFFERENTSITESOFTHESPIRALSAMPLESANDROUGHLYGROUND,FINELYPOLISHED,ANDETCHEDBYANAQUEOUSSOLUTIONOF0501HETHEMICROSTRUCTUREWASOBSERVEDANDANALYZEDWITHANOPTICALMICROSCOPEFORANALYZINGTHEMICROSTRUCTURALDISTRIBUTION3RESULTANDDISCUSSION31EFFECTOFSLURRYTEMPERATUREONTHEFILLINGABILITYTHESLURRYTEMPERATUREHEREISTHETEMPERATUREATWHICHTHESLURRYWASDELIVEREDINTOTHEINJECTIONCHAMBERTHEEXPERIMENTSINDICATETHATTHESLURRYTEMPERATUREHASAGREATEFFECTONTHEFILLINGABILITYOFTHESEMISOLIDA356ALUMINUMALLOYSLURRYTHEFILLINGLENGTHSOFRHEOFORMEDSPIRALSAMPLESATDIFFERENTTEMPERATURESARESHOWNINFIG2,INWHICHTHEPISTONVELOCITYIS0072M/S280E240E,220J20021802160M10MPA015MPA100584586588590592594596FORMINGTEMPERATURE/CFIG2EFFECTOFSLURRYTEMPERATUREONTHEFILLINGLENGTHOFTHESEMISOLIDA356ALLOYSLURRYITCANBESEENFROMFIG2THATTHEVARIATIONTRENDOFFILLINGLENGTHWITHINCREASINGSLURRYTEMPERATUREISSIMILARWHETHERTHEINJECTIONPRESSUREIS10,15,OR20MPA,ANDITISOBVIOUSTHATTHEFILLINGLENGTHINCREASESWITHINCREASINGSLURRYTEMPERATURENAMELY,THEFILLINGABILITYOFTHESEMISOLIDA356ALUMINUMALLOYSLURRYBECOMESGRADUALLYBETTERWITHTHEINCREASINGSLURRYTEMPERATURETHISISBECAUSETHESOLIDFRACTIONANDAPPARENTVISCOSITYDECREASEWITHTHEINCREASINGSLURRYTEMPERATURE,ANDTHEREFORE,THEFILLINGRESISTANCEISLOWERWHENTHESLURRYFLOWSINTHECAVITYANDTHEFILLINGLENGTHINCREASESONTHEOTHERHAND,THEFREEZINGTIMEOFTHESLURRYRESULTINGFROMTHEHIGHERTEMPERATUREWILLBELONGER,ANDTHEFILLINGTIMEMAYBELONGERTHUS,THEHIGHERTHESLURRYTEMPERATURE,THELONGERISTHEFREEZINGTIME,ANDTHEBETTERISTHEFILLINGABILITYHOWEVER,IFTHESLURRYTEMPERATUREISCONSIDERABLYHIGHER,THETURBULENTFLOWANDTHEGASENTRAINMENTMAYBECAUSEDTHEREFORE,THEAPPROPRIATESLURRYTEMPERATURESTHATENSUREACOMPLETELYCOMPACTEDFILLINGMUSTBEADOPTEDITCANALSOBESEENFROMFIG2THATTHEFILLINGABILITYOFTHESLURRYPREPAREDBYLOWSUPERHEATPOURINGWITHWEAKELECTROMAGNETICSTIRRINGISVERYGOODEVENWHENTHESLURRYTEMPERATUREANDTHEREHEATEDDIETEMPERATUREARE585AND120C,RESPECTIVELY,THEFILLINGLENGTHSTILLREACHESUPTO100MM,WHICHINDICATESAGOODFILLINGABILITYFORTHECASTINGSWITH3MMTHICKNESSAND10MMWIDTHIFTHESLURRYTEMPERATURECONTINUOUSLYINCREASESTO595C,THEFILLINGLENGTH50JUNIVSCITECHNOLBEIJING,VOLLS,NO1,FEB2008REACHESUPTOMORETHAN180NUNANDISINARANGEOF180270MM,NAMELY,THEFILLINGLENGTHWILLINCREASETO270NUNWHENTHEFORMINGTEMPERATUREANDTHEINJECTIONPRESSUREARE595CAND20MPA,RESPECTIVELYTHUS,THECOMPLETEFILLINGFORANYCOMPLEXDIECAVITYCANBEENSUREDBYAPPROPRIATELYADJUSTINGTHESLUNYTEMPERATUREANDTHEINJECTIONPRESSURE32EFFECTOFINJECTIONPRESSUREONTHEFILLINGABILITYTHEINJECTIONPRESSUREISTHESTATICPRESSUREEXERTEDONTHESEMISOLIDA356ALUMINUMALLOYSLURRYINTHEINJECTIONCHAMBERITISALSOANIMPORTANTPARAMETERINTHERHEODIECASTINGPROCESS,ANDTHEEFFECTOFINJECTIONPRESSUREONTHEFILLINGLENGTHOFTHESPIRALDIECASTINGSUNDERVARIOUSINJECTIONPRESSURECONDITIONSISSHOWNINFIG3,INWHICHTHESLURRYTEMPERATUREIS585C5I0152025LN,JRCTIONPRESSUREMPAFIG3EFFECTOFINJECTIONPRESSUREONTHEFILLINGLENGTHFROMFIG3,ITCANBESEENTHATTHEFILLINGLENGTHISSHORTERWHENTHEINJECTIONPRESSUREISLOW;HOWEVER,THEFILLINGLENGTHWILLINCREASEWHENTHEINJECTIONPRESSUREINCREASESFOREXAMPLE,WHENTHEINJECTIONPRESSUREIS5MPAANDTHEPISTONVELOCITYIS0048DSTHEFILLINGLENGTHISONLY71MM,WHICHINDICATESAPOORFILLINGABILITYHOWEVER,WHENTHEINJECTIONPRESSUREINCREASESTO15MPA,THEFILLINGLENGTHWILLREACHUPTO110MM,WLUCHINDICATESAGOODFILLINGABILITYMOREOVER,IFTHEINJECTIONPRESSUREINCREASESTOABOVE15MPA,THEFILLINGLENGTHWILLINCREASECONSIDERABLYANDWILLREACHUPTO120190MMTHEVARYINGTRENDOFTHEFILLINGLENGTHWITHTHEINCREASINGINJECTIONPRESSUREMAYBEEXPLAINEDASFOLLOWSWHENTHEINJECTIONPRESSUREISLOW,THEFILLINGPOWERISNOTENOUGHTOOVERCOMETHEFLOWRESISTANCEOFTHESLURRY,THEREFORE,THEFILLINGLENGTHISSHORT;IFTHEINJECTIONPRESSUREINCREASESTHESLURRYWILLGETLARGERPOWERTOOVERCOMETHEFLOWRESISTANCEOFTHESLURRYHOWEVER,IFTHEINJECTIONPRESSUREISVERYHIGHANDREACHESACRITICALVALUE,THEAIRINTHECAVITYCANNOTESCAPEIMMEDIATELY,ANDTHEFILLINGLENGTHWILLDECREASEBECAUSEOFTHEHIGHERADVERSEPRESSURE,ANDTHEGASENTRAPMENTMAYALSOBECAUSED1,31;THUS,AHIGHERPRESSUREMUSTBEADOPTEDIFGASENTRAPMENTMUSTBEPREVENTEDITCANALSOBESEENFROMFIG3THATWHILETHEINJECTIONPRESSUREINCREASES,THEFILLINGLENGTHWILLINCREASECONSIDERABLYIFTHEPISTONVELOCITYINCREASESATTHESAMETIMEFOREXAMPLE,WHENTHEPISTONVELOCITYIS0096DS,IFTHEINJECTIONPRESSUREINCREASESTO25MPA,THEFILLINGLENGTHWILLREACHUPTO240MM,THATISTOSAY,THEFILLINGABILITYISCONSIDERABLYBETTERTHEMAINREASONMAYBETHATTHEHIGHERFILLINGVELOCITYDECREASESTHEHEATEMISSIONOFTHESLURRYANDISFAVORABLEFORTHESLURRYTOFLOWFORALONGERTIMEBEFOREITFREEZES,ANDTHEREFORE,THEFILLINGABILITYWILLBECOMECONSIDERABLYBETTERTHERESULTSINFIG3INDICATETHATIFTHEEXHAUSTIONOFTHEDIEISGOODANDGASENTRAINMENTCANNOTAPPEAR,AHIGHERINJECTIONPRESSUREISFAVORABLETOTHEFILLINGABILITY,ANDTHEFILLINGABILITYOFTHESLURRYPREPAREDBYLOWSUPERHEATPOURINGWITHWEAKELECTROMAGNETICSTIRRINGISALSOVERYGOOD33EFFECTOFPISTONVELOCITYONTHEFILLINGABILITYTHEPISTONVELOCITYISTHEVELOCITYATWHICHTHEPISTONMOVESFORWARDWHENTHESLURRYISFILLEDITISALSOANIMPORTANTPARAMETERINTHERHEODIECASTINGPROCESSFIG4SHOWSTHEEFFECTOFPISTONVELOCITYONTHEFILLINGLENGTH,INWHICHTHESLURRYTEMPERATUREIS585CMIOMPA0I5MPAA20MPAPISTONVELOCIV/MSFIG4EFFECTOFPISTONVELOCITYONTHEFILLINGLENGTHFROMFIG4,ITCANBESEENTHATTHEFILLINGLENGTHINCREASESWITHINCREASINGPISTONVELOCITYWHENTHEINJECTIONPRESSUREIS10MPAANDTHEPISTONVELOCITYIS0024DS,THEFILLINGLENGTHISONLY70MM,WHICHINDICATESAPOORFILLINGABILITYUNDERTHISCONDITIONIFTHEPISTONVELOCITYINCREASESTO0072DSANDTHEINJECTIONPRESSUREISALSO10MPA,THEFILLINGLENGTHINCREASESANDREACHESUPTO100MMHOWEVER,IFTHEPISTONVELOCITYINCREASESTO012DS,THEFILLINGLENGTHWILLINCREASE

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