凝固過程枝晶生長(zhǎng)與微觀偏析的相場(chǎng)法模擬.pdf

1、沈陽理工大學(xué)碩士學(xué)位論文凝固過程枝晶生長(zhǎng)與微觀偏析的相場(chǎng)法模擬姓名：崔海霞申請(qǐng)學(xué)位級(jí)別：碩士專業(yè)：材料加工工程指導(dǎo)教師：張玉妥20090301沈陽理工大學(xué)碩士學(xué)位論文AbstractThephasefieldmethodiseffectivetoolfthesimulationofsolidificationmicrostructure.Itcanimplementsimulationofthecomplexmphologiesofde

2、ndritegrowthinmetalsolidificationinsteadoftrackingthecomplexsolidliquidinterface.Thefmingrulesofmicrostructurecanbeobtainedbasedonthesimulatedmicrostructure.Consequentlythepredictingcontrollingthesolidificationmicrostruc

3、turecanalsoachieved.InthispaperthemicrosegregationtheevolutionofdendritegrowthduringisothermalsolidificationofFe0.5mol%CalloyFe0.5mol%C0.1mol%Mnalloyaresimulatedbyusingphasefieldmethod.Theprimarycontentsofthispaperareasf

4、ollows:1.TheevolutionofdendritegrowthduringisothermalsolidificationofFe0.5mol%Calloyissimulatedbyusingphasefieldmethod.Themphologyofdendritewithsecondarybranchisobtained.thegrowththecompetitionamongthedendriticarmsarerea

5、ppearedinthesimulation.2.ThesolutedistributionmicrosegregationofdendritegrowthduringisothermalsolidificationFe0.5mol%Calloyarepredicted.Therearethesoluteenrichmentdendritesegregationduringthesolidification.Theconcentrati

6、onintheprimaryarmsislowesttheconcentrationoftheliquidphaseamongthearmsishighestduetothesoluteenrichment.Thesoluteconcentrationofthedendritictipislowerthanthatoftheliquidphaseamongthearms.3.Theeffectoftheundercoolinginter

7、facethicknessanisotropycoefficientsthenoisecoefficientsonshapesofdendritesdistributionofsolutefdendritegrowtharestudiedwhicharetheparametersinthephasefieldmodel.Thetheundercoolinghasagreatinfluenceonthemphologyofdendrite