相场法定量模拟强迫层流对微观偏析的影响（英文）.pdf

《相场法定量模拟强迫层流对微观偏析的影响（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、TransactionsofNonferrousMetals塑Avai：lableonSlinecaitewnwwc,secieDnceidrierect．ctomSocietyofChinaPressTrans．NonferrousMet．Soc．China22(2012)391—397www．tnmsc．cnEffectofforcedlaminaflowonmicrosegregationsimulatedbyphasefieldmethodquantitativelyWANGJun．wei，WANGZhiping1,2LUrang一ZHUChang

2、—sheng，FENGLi，XIAORong—zhen，1．StateKeyLaboratoryofGansuAdvancedNonferrousMeta1Materials．LanzhouUniversityofTechnology，Lanzhou730050，China；2．ResearchCenterofGansuNonferrousMetalMaterialsandCompositeMaterialsEngineering．Lanzhou730050，China；3．CADCenter，LanzhouUniversityofTechnology。L

3、anzhou730050ChinaReceived14March20ll：accepted18June20llAbstract：Theinfluenceofsupercooledmeltforcedlaminaflowonmicrosegregationwasinvestigated．Theconcentrationdistributionatsolid-liquidboundaryofbinaryalloyNi-Cuwassimulatedusingphasefieldmodelcoupledwithflowfield．Themicrosegregati

4、on，concentrationmaximumvalue，boundarythicknessofconcentrationnearupstreamdendriteandnorma1toflowdendrite，anddownstrearndendritewerestudiedquantitativelyinthecaseofforcedlamiaflow．Thesimulationresultsshowthatsolutefieldandflowfieldinteractcomplexly．Comparedwithmeltwithoutflow,infro

5、ntofupstreamdendritetip．theconcentrationboundarythicknessisthelowestandtheconcentrationmaximumvalueisthesmallestformeltwithflow．However,infrontofdownstreamdendritetip，theresultsareiusttheopposite．ThezoneofpoorCuinupstreamdendritewhereisthemostseverelymicrosegregationandshrinkageca

6、vityiswiderandtheconcentrationislowerformeltwithflowthanthatwithoutflow．Keywords：computersimulation；phasefieldmethod；solidification；forcedlaminaflow；microsegregation；soluteredistribution；shrinkagecavityfrontofups仃earndendrite．normaltoflowdendriteand1Introductiondownstreamdendritei

7、ndetail．Maximalconcentrationvaluesinfrontof3directionsofdendritewerealsonotCastingperforlllanceisinfluencedbythecontrasted『2，1l，12，l71．solidificationmicrostructureofalloysf11．DecreaseinT{ingbinaryalloyNi-0．408Cuforanexample．shrinkagecavityisoneofthehotspotsatpresent[2，3]．solidific

8、ationmicrostructureundertheefecto