AlSi9Mg合金半固态坯料制备有限元分析及工艺参数优化

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1、1053309{号：塑竺堕塑型仑肥工学火警HefeiUniversityofTechnology硕士学位论文MASTERDISSERTATIoN③论文题目：A}SigMg合金半固态坯料制备有限元分析学位类别：——学科专业：(工程领域)作者姓名导师姓名完成时间及工艺参数优化学历硕士材料／Jnl'l-程张早明薛克敏教授2007年4月TheFEMResearchandTechnicalParametersOptimizingoftheProcessofAISigMgAlloySemi—solidBilletProductionABSTRACTTopr

2、omotetheapplicationofsemi-solidformingtoindustry,thenumericalsimulationtechnologyhasbeenappliedtotheanalysisoftheprocessofA1SigMgalloysemi—solidbilletproductionbypouringnearliquids．Tl"effectofpouringtemperature，pouringheight，pouringveloeityandcoolingconditiononthevelocityfie

3、ldandtemperaturegradienthasbeeninvestigated，andtheeffectonmicrostructureofthesemi-solidbillethasalsobeenresearched．Theresultsofnumericalsimulationandexperimentshowsthat：theliquidmetalflowsmainlyalongaxis，onlyalittlemetalalongradius，butmoreandmoremetaiwillflowalongradius．Asar

4、esult，theshearingstrengthoftheliquidmetalisverylarge，whichhaveasignificantinfluenceontheformingofnon—dendritegrains．Alowerpouringtemperature，alowercoolingintensity,ahigherpouringheightandahigherpouringvelocityarepronetoformingsphericalornodulargrains．Thenbasedontheresultsoft

5、henumericalsimulationandtheprincipleoftheorthogonalexperimentation，selectappropriatetechnicalparameters，andresearchtherelationofthetechnicalparameters．Theresultshowsthatasfarasthetemperature，theeffectofcoolingintensityisthebiggest，followingwithpouringtemperature，pouringveloc

6、ity,pouringheight．Comparedwiththeeffectofthecoolingintensity，theotherscanbeignored．Asfarastheflowfield，theeffectofpouringvelocityisthebiggest，followingwithpouringheight，pouringtemperature，coolingintensity．Comparedwiththeeffectofthepouringvelocity,theotherscanbeignored．Thebes

7、ttechnicalparameterarrayistheoneofpouringtemperatureis610"C，pouringvelocityis1．2kg／s，pouringheightis20ram，andthedieheatupto200℃．experimentresultofthetrueprocessshowsthattheresultofthenumericalsimulationiscorrect,andthistechnologycanobtainthewonderfulAlSigMgalloysemi-solidbil

8、letwithsphericalornodulargrains．Keywords：semi-solid；A1SigMg；billetproductio