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时间:2020-04-25
《冷却速度对Al-7Si-0.3Mg-0.15Fe合金凝固参数和微观组织的影响-论文.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、Availableonlineat、^n^n^f.sciencedirect.comTransactionsof嘞ScienceDirectNonferrousMetalsSocietyofChinaELSJ三ⅥERPressTrans.NonferrousMet.Soc.China24(2014)1645—1652WwW.tnmsc.CrlEffectofcoolingrateoNsolidificationparametersandmicrostructureofA1—7Si一0.3Mg一0.15FealloyRuiCHEN,Yu—fengSHI,Qing—yah
2、XU,Bai—chengLIUKeyLaboratoryforAdvancedMaterialsProcessingTechnologyofMinistryofEducation,SchoolofMaterialsScienceandEngineering,TsinghuaUniversity,Beijing100084,ChinaReceived18June2013;accepted8September2013Abstract:Theeffectsofcoolingrateonthesolidificationparametersandmicrostructureo
3、fA1-7Si~0.3Mg一0.15Fealloyduringsolidificationprocesswerestudied.Toobtaindiferentcoolingrates.thestepcastingwithfivediferentthicknesseswasusedandthecoolingratesandsolidificationparametersweredeterminedbycomputer-aidedthermalanalysismethod.Theresultsshowthatathighercoolingrates.theprimary
4、a(A1)dendritenucleationtemperature.eutecticreactiontemperatureandsolidustemperatureshifttolowertemperatures.Besides.withincreasingcoolingratefrom0.19。C/supto6.25。C/sthesecondarydendriticarlnspacingdecreasesfrom68txmto20gm.andtheprimarydendriticvolumefractiondeclinesbyapproximately5%.Ina
5、ddition,itreducesthelengthofFe.bearingphasefrom28pmto18Binwithabetteruniformdistribution.Itisalsofoundthathighcoolingratesmakeformodi~ingeutecticsiliconintofibrousbranchedmorphology,anddecreasingblockorlamellashapeeutecticsilicon.Keywords:aluminiumalloys;coolingrate;thermalanab,sis;soli
6、dificationparameters:microstructurecoarseplate.1ikeeutecticsiliconintofineandfibrous1Introductionform.Coolingratecaninfluencethetemperaturegradientandsolidificationrate.andisoneofthemostWithgoodcombinationofcastability,corrosionimportantvariableswhichafectmicrostructureandresistance,hig
7、hspecificstrength,especiallyinheatmechanicalpropertiesofcastings[2,6,7】.Athighertreatedconditions。A1-Si—Mgcastingalloyshavecoolingrates.moredendriteswithsmallsizewillbeachievedwidespreadusageinautomotiveandaerospaceformed[8],resultinginlowerandmoreuniformindustries.Thesealloyso
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