简介：ThesecondphaseparticledispersedinmicroaUoyedsteelhasdifferenteffectsongraingrowthdependingontheirsizeandvolumefractionofthesecondphaseparticleswhichwillchangeduringweldingthermalcycles.Theparticlecoarseninganddissolutionkineticsmodelwasanalyzedforcontinuousheatingandcooling.Inaddition,basedonexperimentaldata,thecoupledequationofgraingrowthwasestablishedbyintrodacinglimitedsizeofgraingrowthwiththeconsiderationofthesecondphaseparticlespinningeffects.UsingMonteCarlomethodbasedonexperimentaldatamodel,thegraingrowthsimulationforheat-affectedzoneofmicroalloyedsteelweldswasachieved.Thecalculatingresultswerewellinagreementwiththatofexperiments.
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