镍基单晶高温合金γ′相筏化组织三维相场模拟研究.docx

镍基单晶高温合金γ′相筏化组织三维相场模拟研究
Title:Three-DimensionalPhase-FieldSimulationStudyonRaftingMicrostructureofγ′PhaseinNickel-BasedSingle-CrystalSuperalloys
Abstract:
Nickel-basedsingle-crystalsuperalloysarewidelyusedinhigh-temperatureapplicationsduetotheirexceptionalmechanicalpropertiesandresistancetocreepdeformation.Theγ′phase,whichconsistsofasolidsolutionofNi_3Al,playsacrucialroleindeterminingthemechanicalpropertiesofthesealloys.Theraftingphenomenon,wheretheγ′phasepreferentiallyalignsalongcertaincrystallographicdirections,significantlyaffectsthemechanicalbehaviorofthesematerials.Inthispaper,athree-dimensionalphase-fieldsimulationapproachisusedtoinvestigatetheraftingmicrostructureoftheγ′phaseinnickel-basedsingle-crystalsuperalloys.
1.Introduction:
1.1Backgroundandsignificanceofthestudy
1.2Objectiveofthestudy
2.MaterialsandMethods:
2.1Overviewofnickel-basedsingle-crystalsuperalloys
2.2Phase-fieldsimulationmethod
2.3Simulationparametersandboundaryconditions
3.ResultsandDiscussion:
3.1Formationandevolutionoftheγ′phase
3.2Raftingphenomenon:Mechanismsandfactorsinfluencingrafting
3.3Influenceofraftingonmechanicalproperties
4.Conclusion:
4.1Summaryofthestudy
4.2Significanceandpotentialapplications
4.3Futuredirections
1.Introduction:
1.1Backgroundandsignificanceofthestudy:
Nickel-basedsingle-crystalsuperalloysareextensivelyemployedintheaerospaceandpowergenerationindustryduetotheirremarkableresistancetohigh-temperaturecreepdeformation.Theγ′phase,whichisastrengtheningprecipitatecomprisedofNi_3Al,significantlycontributestothemechanicalpropertiesofthesealloys.However,duringserviceatelevatedtemperatures,theγ′phasetendstoundergoaraftingphenomenon,resultinginthepreferentialalignmentoftheprecipitatesalongcertaincrystallographicdirections.Thisraftingprocesscannegativelyimpactthemechanicalpropertiesofthealloysandmustbethoroughlyunderstoodtooptimizetheirperformance.
1.2Objectiveofthestudy:
Themainobjectiveofthisstudyistoutilizethree-dimensionalphase-fieldsimulationstoinvestigatetheraftingmicros