砂型、变质处理和时效温度对a356铝合金力学性能与组织的影响

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1、砂型、变质处理和时效温度对A356铝合金力学性能与组织的影响获得优异的最终性能。关键词：A356，铸造工艺，熔炼，砂型，变质，热处理ⅡAbstractInthisstudy，A356，thecommonlyusedcastaluminumalloy，isresearchedintheconditionsofsandcasting，analyzetheinfluenceofdifferentprocessfactorsonthemechanicalpropertiesandMetallographicmicrostructure．Pro

2、cessinclude：materialsofdifferentshapes，differentwallthickness(equaltothecoolingrate)，memeltprocessing，differentmetam。rphicagentanddifferentamount0f’ageingheatCastingtheladderspecimenwithordinarysilicasandandchromitesandinA356al岫i眦malloy,confirmedthechillingeffectofthech

3、romitesandinthecastmgotalumin岫alloy,ChillingroleinmakingeffectiverefinementofgramSIZe，secondarydendritea加spacingissubstantiallyreduced，andplayaroleinthetme鲈amstren舢ening；Atthethin．walled，grainsizeandsecondarydendrite锄spaclng，tensilestrength，hardnessandelongationbetterth

4、anathickwall；oDmparison0fslllCa啪d柚dchromitesand，silicasand，heatdissipationislessthanthechromltc锄d'chromes柚dcastin铲secondarydendritearmspacinggrowthrateofSillall’coolingrate辩nsitivityissmall．Indailyproduction，incasetherearestrictrequirementsorspecialrequirementsonthecast

5、ingpartchromitesandinsteadofsilicasand，playtheroleofthecoldiron．Di能rentModificationsAlloywithdifferentamountsofresearchshowsthat：Srclements既nbce量fcctiveforAl—Sialloymetallographicleavening,impmVethemech觚icalpropertiesofthecasting,especiallytheelongationofsubstantlaliIIl

6、provement．1eaveningagent，toincreasetheplasticityandtoughnessofthecastlng，tlle陀bvthehardnessdecreasedslightly,AccordingtothetrendofthemechanicalpropertiesofSraddedisgenerallyO．1％-0．2％ofthetotalweight·Theex∞ssiVeiIlc北；a∞ofSrinthealuminummeltbreathing，pronetoholesandotherd

7、efects；REleaveningagentnotonlyCalleffectivelydegenerate，andcaneffectivelyrefinethea．pha∞structureplayaroleinthegrainrefinement，SOthattheperfom锄ceiIIlprovement，especiallyplasticityincreases，littlechangeinhardness·ComparedtoAI．Srleaveningseparateorganizationfiner,betterpe

8、rformance，bettercastingquality；JointleaveningagentcastinggrainsizebetweenA1-SrandAl-REgrainsandporosityandothe