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大小:1.21 MB
页数:6页
时间:2020-04-30
《双辊激冷铸造A8006合金的均匀化(英文).pdf》由会员上传分享,免费在线阅读,更多相关内容在行业资料-天天文库。
1、Availableonlineatwww.sciencedirect.com_一dip,TransactionsofI二ScienceDirectNonferrousMetals鲎SocietyofChinaEIs]已ⅥERPressTrans.NonferrousMet.Soc.China22(201211280—1285www.tnmsc.cnHomogenizationoftwin-rollcastA8006alloyCHENZhong—wei,LIShi—shun,ZHAOJingStateKeyLaboratoryofSolidificationProcessing,Northw
2、esternPolytechnicalUniversity,Xi’an710072,ChinaReceived2June2011;accepted18October2011Abstract:Microstructureandhardnessoftwin—rollcasting(TRC)processanddirect—chillcastingfDC)forA8006alloywithandwithouthomogenizationwereinvestigatedbymeansofscanningelectronmicroscopy(SEM).X.raydiffractionanalysis
3、andVickershardnessmeasurement.TheresultsshowthattheeutecticphaseofthehomogenizedTRCalloybecomesfineasthemicrostructureoftheas.castTRCalloyisrefined.Theshortrodlikeeutecticphaseoftheas.castTRCalloyisdispersedhomogeneously,whichissimilartothemorphologyofcutecticphaseofthehomogenizedDCalloy.Afterhomo
4、genization.elementsFeandMninDCandTRCalloysarediflusedfromeutecticphasetoAlmatrix.resultinginthedecreaseofmicrohardness.Theformabilityoftheas—castTRCalloyissuperiortothatofthehomogenizedDCalloy.ForTRCA8006alloy,thehomogenizingcyclecanberemovedfromthesubsequentprocessing.Kevwords:A8006alloy;twin—rol
5、lcasting;homogenization;microstructurealloyingelementsinsolidsolutionbeforesubsequent1Intr0ductiOntherrnomechanicalprocessing[7,1l一12].However,thehighsolidificationrateencounteredinTRCnotonlyDuetothegoodcombinationofrapidsolidificationfavorsthesupersaturationandmetastableconditionbutandhotrollingi
6、ntoasingleoperationtofabricatethinalsohindersmicrosegregationofthealloyingelementsstripsorsheetsdirectly[1-3],twin·rollcasting(TRC)[13,14].TRCprocessedA1Fethinstripsshowsomeprocesshasadvantagesoflowcapitalinvestmentandma~eddifferenceswithrespecttoconventionalcastlowoperationalcost.andhasattractedg
7、lobalmetalstripsintheirresponsetoanannealingtreatment[15,16].producersasthesheetsorstripsproducedhaveafineTherefore,itispossibletoremovethehomogenizingsolidificationmicrostructuref4,5].Thisprocesscan仃eatmentfromT
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