低碳鋼中第二相的形成與分布.pdf

1、東北大學(xué)碩士學(xué)位論文低碳鋼中第二相的形成與分布姓名：王佳夫申請學(xué)位級別：碩士專業(yè)：材料加工工程指導(dǎo)教師：張曉明20040201東北大學(xué)碩士學(xué)位論文ABSTRACTFormationanddistributionofthesecondphaseinlowcarbonsteelAbstractnlcworksofthispaperwerecarriedoutintegratingwiththe973projectsofTheMajorBas

2、kResearchForNewGenerationSteelMaterialsandthe863projectofTheAdvancedIndustrial^缸nufactureTechnologyof500MPaCarbonSteelHotsimulationexperimentsandhotrollingexperimentsoflOWcarbonsteelwitlldifferentcompositionwereperformed

3、inalaboratoryTheformationanddistributionofthesecondphaseandthepropertiesoflOWcarbonsteelwithdifferentmicrostructureswereinvestigated曰1emainworksandcorrespondingresultsasfollows：1Thecontinuouscoolingtransformationexperime

4、ntsofSS400steelwithoutdeformmionand45％compressivedeformationat860℃werecarriedoutattheGleeble1500thermomechanicalsimulatorandthesecontinuouscoolingtransformation化CT)curvesweregottenThemicrostructuresofthetestedsteelindiff

5、erentconditionswereanalyzedTheresultsindicatethathotdeformationincreasestransformationtemperature，refinesmicrostructureanddecreasesthefi—actionofsecondphaseDeformationincreasesthecriticalcoolingratetoformbaini把a(bǔ)ndrestrai

6、nstheformationofbalnite2ThecompressionexperimentsofANS400steelwereperformedattheG1eeble1500thermomechanicalsimulatorn鹼effectofcoolingratedeformationtemperature，interpasstimeanddeformationamountonthesecondphaseandtheprope

7、rtiesoftestedsteelwerestudiednleresultsshowthatsecondphaseisrefinedandit’sfractiondecreaseswiththedecreaseofdeformationtemperatureTheinfluenceofdeformationonsecondphasefractioniSgreaterwhencoolingrateiSlOWTheeffectofinte

8、rpasstimeonsecondphasefractioniSnotobviousandthepropertiesoftestedsteeIdecreasewhenimerpasstimeiStoolongTheinfluenceofdeformationonbalnitemicrostructureiscomplex3HotrollingexperimentsofAN$400steeIandSS400steelwerecarried

9、outinalaboratory可他effectofreheatingtemperature，coolingrate，coilingtemperatureandMnfractiononthesecondphaseandthepropertiesoftestedsteelWCIeinvestigated，andmicmstmctureswereobservedbyTEMn持resultsindicatethatthesecondphase