304不锈钢多层多道焊接热影响区晶粒长大的计算机模拟

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1、304不锈钢多层多道焊接热影响区晶粒长大的计算机模拟ComputerSimulationofGrainGrowthinHeatAffectedZoneofMultilayerWeldingfor304StainlessSteel姓2013年6月江苏大学硕士学位论文AbstractDuringtheweldmgprocessofmid·thickplate，multilayerweldingisimplementedquicklybysmallercurrentandlesslineenergyinputcomparedtosi

2、nglepasswelding．Inaddition,thenextweldhastheroleofheattreatmenttothe舶ntweld，thefeSidllalstressanddeformationafterweldingisreduced，andthepropertiesofweldedjointsareimproved．However,thecoarsengraingrowthinHeatAffectedZone(HAZ)ofmultilayerweldingandsingleweldinginvaryi

3、ngdegreesreducesthematerialductilityandtoughness，whichcausesdecreasingofmechanicalpropertyoftheweldjointsdecreaseduetolocalandinstantaneousheatingandcooliI玛process．Inordertostudyhowthethermalprocessofthemulti-passweldinginfluencesthegraingrowthinHAZ，wesimulatedthegr

4、owthinHAZof304stainlesssteelbyusingMonteCarlomethod．Thesimulatedresultswerecomparedwithexperimentalresults．Somefactorsinfluencingthegraingrowthwerestudiedindetail．First，thermalfieldsinmulti—passweldingweresimulatedtogetreasonablethermalcyclesforMCsimulationusingthef

5、initeelementsoftwareANSYS．TheexperimentaldatabasedonEBDmodelwasusedtoestablishtherelationbetweentMCSandrealtimetemperature．Second，thesimulationprogramwasworkedoutbasedonMCtechnologywithMATLAB．ThemicrostructureevolutionofweldedjointsandtheprocessofgraingrowthinHAZoft

6、hemulti-passweldingweredescribed．Inthepaper，somefactorsinfluencingthegraingrowth，weldingheatinput，heatpining，initialtemperature，interpasstemperature,andthegraingrowthprocessinHAZduringheatingandcoolingcycle，werestudiedspeciallyusingMCtechnique．Ourresearchindicated：t

7、hegreatertheheatinputisatthesamedistancefromthefusionlineposition，thelargerthediameterofthegramis，thenearerthedistancefromthefusionlineisinthesameheatinput，thelargerthediameterofgrainis；the304不锈钢多层多道焊接热影响区晶粒长大的计算机模拟heatpinningphenomenoncausedbytemperaturegradienthad

8、obviousinhibitingeffecttothegraingrowthnearthefusionline；thecontn'butiontothegramgrowthintheheatingstageisverysmall，andthegraingrowthwasma