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A356.2Si*650502SiSi。A356.2SiTG146.2A1006－0308201103－0056－05TheEffectofSiliconSegregationinA356.2CastingAluminumAlloyProductionZHAOYa－yaoZHANGYa－hongTIANSu－lanWANGHaoYUANChong－shengYunnanAluminumCo．Ltd．KunmingYunnan650502ChinaABSTRACTTheimpactofthesamplingincastingaluminumalloyproductionatdifferenttimeandsituationonSisegregationandtheimpactofSisegregationontheproductsisdiscussedinthispaperviathetestsanditisaguidancetoproduction．KEYWORDSA356．2castingaluminumalloyproductionSisegregationsamplingtimecastingtime1、、、、、、、、。120～140kg。、80%80%70%。50%。A356.2Mg2Si。TiSr≥60HB、≥124MPa、≥114MPa、≥7%A356.2。2A356.2Si、1、、、、1。SiSi。SiAl－Si－Mg6520116403228YUNNANMETALLURGYJun．2011Vol.40．No.3Sum228*2010－09－101974－。MgMg2SiSi3.5%2。1Fig.1Crystalsegregation3Si3.1Si、Fe。SiFe、Si。27.1%Si0.24%Mg0.15%FeFig.2Alloycomposition7.1%Si0.24%Mg0.15%FeαAlSi37.1%Si0.24%Mg0.15%FeFig.3Alloycomposition7.1%Si0.24%Mg0.15%FeSiαAl。3.2SiSi3、。47%Si0.4%MgFig.4Alloycomposition7%Si0.4%MgMgFeβAl9Fe2Si2Al8FeMg3Si6。Mg2SiSi。3.3。4。4、A356.2Si0.10%～0.25%0.30%。11“”1～824t2210m225t“”9～1618t2117m120t75A356.2Si。2①ThermoARL3460MetalsAn-alyzer②KC356EH③22℃30%。3①②640～680℃③10min4A356.2Si6.7%～7.30%Mg0.30%～0.40%Ti0.012%～0.18%Sr0.020%～0.030%Fe≤0.12%MnCuZn。575～80min。65Fig.5Theflowchartforcastingofaluminumalloybar5A356.2Si16～9。8520116403228YUNNANMETALLURGYJun．2011Vol.40．No.3Sum2281A356.2SiTab.1ThestatisticalchartfortheimpactofthesamplinginA356．2castingaluminumalloyproductionatdifferenttimeandsituationonSisegregation/min1020304050/%/%10337.157.037.147.006.977.057.026.877.1020347.157.127.077.177.127.037.096.987.0831337.157.027.016.876.896.967.006.997.0341347.157.157.066.887.036.676.976.987.1152317.157.146.866.916.987.066.947.027.2062327.157.057.127.116.997.137.057.067.1773317.156.857.157.057.217.056.977.047.2983327.156.887.296.997.137.047.257.087.2090237.37.077.017.077.097.127.167.087.18100247.37.067.057.077.057.097.077.057.08111217.37.27.046.957.007.077.017.097.31121227.37.237.077.057.116.946.917.127.28136237.37.027.127.127.247.087.187.077.00146247.37.17.187.107.107.227.186.977.16157217.157.197.257.187.257.197.347.107.14167227.157.117.157.077.187.147.057.017.09640minFig.6Analysisforproductpracticalsamplesandsamplescastingfor40minutes740minFig.7Analysisforproductpracticalsamplesandsamplescastingfor40minutes95A356.2Si6181286～91640min42740min60.44%37、8480.25%590.33%。7A356.2。Si10%A356.2。8140min23Si40min4Si1、TiSi、Mg、Sr。、240min3、4630～690℃110～160r/min。1．M．1987．2．M．1983．3．M．2005．4．M．2008．0620116403228YUNNANMETALLURGYJun．2011Vol.40．No.3Sum228