ResearchontheMicrostructuresandPropertiesofTiBearingHotdipGalvanizingMultiphaseSteel

ResearchontheMicrostructuresandPropertiesofTiBearingHotdipGalvanizingMultiphaseSteel.pdf
Thecontinuousannealingsimulatorwasusedtoinvestigatetheinfluencesofannealingtemperatureonmechanicalpropertiesofahighstrengthhot-dipgalvanizingMP980steel.Baseonthesesimulationprocessabove,thekeyprocessforindustrialproductionofhot-dipgalvanizingmultiphasesteelof980MPagradehasbeenestablished.Themicrostructuresandmechanicalpropertiesofindustrialtrialproductswereinvestigatedbymeansofmechanicalpropertiestesting,opticalmicroscope(OM),themultiphasestructureaswellasdislocationdistributionandprecipitationbehaviorsofsecond-phaseparticleforthecontrollingofmechanicalpropertyuniformityofhot-dipgalvanizingMP980steelarealsoresearchedbytransmissionelectronmicroscope(TEM).Theresultsshownthattheyieldingstrengthrisesastheannealingtemperatureincreases,thestress-straincurveofexperimentsteelsexhibitedcontinuousyieldingfeatureafterdifferentannealingprocess,undertheappropriateintercriticalannealingconditions,themicrostructuresoftheexperimentsteelconsistedofnearlypolygonferrite,bainite,finedisperseddistributionmartensiteandretainedausteniteislands.Thedislocationdensitydecreasesgraduallyfromtheferrite-martensiteinterfaceandferritegrainboundarytotheinnerpartofferrite.Therearetwodifferentsizesandtypesofprecipitates,onetypeissmalldispersionprecipitatewithsizeof15~50nm,theothertypeofprecipitatesissquareshapewithsizeof50~200nm.Theexperimentsteelhasthecomprehensiveperformancewiththetensilestrengthof1039MPa,yieldstrengthof776MPa,elongationof12#,attheintercriticalannealingtemperatureof800℃,slowcoolingtemperatureof700℃,rapidcoolingtemperatureof460℃andthecoolingrapidrateof35℃persecond.Itisbelievedthatmartensitegraindispersedrefinementdistributionandprecipitationstrengtheningaremainfactorscontributingtohighstrengthofsteelsheet.Theseoff-lineproductsreachedthesamelevelofmechanicalpropertiesastheimportedproductsthroughtwotimesindustrialtrialandhavebeensuccessfullyappliedtosomejointventurevehicles.
作者：QIUMushengHANYunKUANGShuang
作者单位：SheetMetalResearchInstitute,ShougangGroupCo.,LTD.ResearchInstituteofTechnolog
母体文献：2018中国汽车工程学会年会论文集
会议名称：2018中国汽车工程学会年会  
会议时间：2018年11月1日
会议地点：上海
主办单位：中国汽车工程学会
语种：chi
分类号：
关键词：multiphasesteel  microstructures  mechanicalproperties  precipitates
在线出版日期：2021年9月26日
基金项目：
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ResearchontheMicrostructuresandPropertiesofTiBearingHotdipGalvanizingMultiphaseSteel.pdf

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