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ID:32195654
大小:2.96 MB
页数:66页
时间:2019-02-01
《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》由会员上传分享,免费在线阅读,更多相关内容在学术论文-天天文库。
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
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