双辊激冷铸造A8006合金的均匀化（英文）.pdf

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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