学科分类
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247 个结果
  • 简介:UnderstandingthecomplexphenomenainBFhearthisessentialtoincreasefurnaceproductivityandtoextendfurnacecampaign.Wehavedevelopedseveralcontinuum-basedmathematical/numericalmodelstosimulatethemulti-phaseflow,heattransferandchemicalreactionsintheBFhearth.Thesemodelshavegeneratedanimprovedinsightonthemechanismsforliquiddrainageefficiency,liningerosionandwallprotectioninBFhearthunderoperationalconditions.Thecurrentpapergivesanoverviewofthesestudiesinthreeaspects:Gasflowandpressureontheliquidsurface,andtheireffectonthedrainagecharacteristics;TheflowandtemperaturedistributionsofliquidironinBFhearth,andthetemperaturedistributionintherefractories;Finally,titaniumbehaviorsduetotitaniainjectiontoformTi(C,N)-richscaffoldonthehearthsurface,toprotectthehearthfromerosion.

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  • 简介:Multiphaseflowcontrolwithelectromagneticbraking(EMBr)iswidelyusedinthecontinuouscastingofsteelslabs.Thebasicaimoftheflowcontrolsystemoftheprocessistodelivermoltensteelfromtheladlethroughthetundish,uppertundishnozzle,slidegate,andsubmergedentrynozzleintothemoldregionwithminimaldefects.Thisrequirestheoptimizationofturbulencelevelsatameniscustoavoidbothanexcessivelyfastflow(whichcreateshighfluctuationsofthemeniscuslevelinadditiontoslagentrapment,surfacenonuniformities,andsurfacedefects)andinsufficientslowflow(whichleadstomeniscussolidification,inadequatefluxinfiltration,andsurfacedefects).Inthisstudy,aEulerian-LagrangianapproachisusedtoinvestigatetheeffectsofEMBrandArbubbleinjectiononthesurfaceflowvelocity.TheresultsshowthathighArinjectionratescanleadtoanincreaseinsurfacevelocity.

  • 标签: 电磁制动 流体流动 欧拉-拉格朗日方法 表面缺陷 中间包水口 动模
  • 简介:Inordertoimproveargonblowingefficiencyina40tonladle,numericalsimulationandwatersimulationexperimentsofthebottomargonflowwereperformed.Relationshipsamongtheladlemixingtime,slageyearea,differentblowingflowrates,anddifferentblowingpositions(0,0.56R,0.62R,0.67R)arediscussed.Resultsshowedthattheladlemixingtimedecreasedwhentheargonblowingbrickdistance(frombottomcenteroftheladle)increased,anddecreasedsignificantlywhentheblowingflowincreasedfrom70to130L/h.Whentheblowingflowincreasedandexceeded130L/h,thestirringeffecttendedtobestable,andtherewaslittleeffectontheladlemixingtime.Theslageyeareaincreasedastheargonbrickdistanceincreased,andwaslargerwhentheargonblowbrickwasneartheladlewall.Wallshearstresssignificantlyincreasedasthebrickdistanceincreasedandwasconcentratedattheslagwallneartheargonflowbrick;thisiscalledthemostseriouserosionwall.Theaveragewallshearincreasedexponentiallywithincreasingargonblowingbrickdistance.

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  • 简介:MaterialFlowAnalysis(MFA)isacrucialinstrumentforsustainabledevelopmentandcreatingindustrialecologysystem.MFAstudiescouldbalanceandanalyzethesources,flows,andconsumesofspecificmaterialsorsubstances.TheresultsofMFAstudiescouldsupportthestrategiesordecisionsmakingforenergy,resource,andwastemanagement,especiallyachievingsustainableresourcemanagement.AtCSC,thedynamicsimulatingsoftware,STELLA,isusedtodevelopaMFAmodelforscenarioanalysis.CSCalsousesthefreewareSTAN2.0asatoolforvisualizingandsimulatingmaterialflowsandstocks.CasestudiesofgreenhousegasesMFAforintegratedsteelworksareconducted.Theresultsshowedthatthecarboncontentofhot-metalisanimportanthiddenflowforbalanceanalysis,andthedifferentGHGemissionscenariosandmitigationactionscenariosareassessed.Inaddition,theIron-makingGHGI/OMFAModel,basedonworldsteelGlobalSteelSectorApproach(GSSA),isdevelopedforcalculatingtheCO2andenergyintensityofcokemaking,sintering,andBFprocesses.ThisMFAmodelwasusedtoanalyzetheCO2reductionpotentialforiron-makingprocess.ThecasesconductedforMFAapplicationsatCSCweresuchasgreenhousegas,zinc,etc.Inthefuture,CSCisgoingtodevelopa'CSCEnvironmentManagementandDecisionSupportingSystem'whichcombineMFA,LCA(lifecycleassessment),andenvironmentriskassessment.Thissupportingsystemexpectstopromotingenergyefficiencyandbestresourceuse,supportingenvironmentpolicymaking,creatingenvironmentalinformationvalue,etc.

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  • 简介:Inthisstudy,theeffectsofstandoffdistance(SoD)onthesupersonicflowfields(includinggasandparticleflowfields)duringcoldgasdynamicspraying(CGDS)areinvestigatedbymeansofcomputationalfluiddynamics(CFD).Thevariationofvelocity,temperature,pressureanddensitywithdifferentSoDiselucidatedthroughtheanalysisofthedistributionpropertiesoftheflowfields.Itisfoundthattheshockwavesinfrontofthesubstrateremarkablyinfluencethegasandparticleflowfields.Thewavesystemofexpansionwavesandpressurewavescomeintobeingcontinuously.ThevelocityofgasreachesthesupersonicspeedatthepositionoftheMachdisc,whileitdecreasessharplywhenthegasflowcrossestheMachdisc.TheoptimalSoDsare40mmfor1μmparticlesand50mmforboth5μmand22μmparticles.

  • 标签: 超音速流场 气体动力学 喷涂距离 防区外 冷喷涂 气体速度
  • 简介:A0.02%Cplaincarbonsteelanda0.11%CNb-modifiedsteelweretestedincompressionintheaustenitetemperaturerange.Thecriticalstrainsfortheinitiationofdynamicrecrystallizationweredeterminedfromthe41stress-straincurvesobtained,usingthedoubledifferentiationmethod.Theworkhardeningbehavioruptothecriticalstrainwasanalyzedwiththeaidofadislocationdensitymodelandtheworkhardeningparametersrandhwerederivedinthisway.Theseparameterswereusedtomodeltheausteniteflowcurvesbeyondthecriticalstrain,i.e.intheabsenceofdynamicrecrystallization.Thenetsofteningattributabletodynamicrecrystallizationwasdefinedasthedifferencebetweenthecalculatedworkhardeningcurveandtheexperimentalflowcurve.ThesofteningdataareexpressedintheformofAvramikinetics.UsingthedependencesoftheworkhardeningparametersandAvramikineticparametersonZ,theZener-Hollomonparameter,itisshownhowtheflowcurvespertainingtoindustrialrollingconditionscanbemodeled.

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  • 简介:Aphysicalmodelwithmercuryasanalogwasdevelopedtoinvestigatetheinfluencesofelectromagneticstirring(EMS)onflowfieldinslabcontinuouscastingwhenthesubmergedentrynozzle(SEN)wascloggedwithdifferentcloggingrates(0,10%,25%,and50%).TheflowfieldinmoldunderdifferentEMScurrents(0,40A,and60A)wasmeasuredbyanultrasonicDopplervelocimeter.Theresultsprovedthattheflowfieldinthemoldwasatypicaldoublerollstructureundernon-cloggingSEN.AstheSENcloggingrateincreased,theflowfieldstructurewastransformedfromadoublerolltoasymmetryflow.Whenthecloggingratereached50%,theupcirculationdisappearedonthecloggedside.Thezoneunderthemeniscusnearthenarrowfacewasanon-flowingarea.EMScouldcorrectbiasflowcausedbySENcloggingandimprovethesymmetryoftheflowfieldduringSENclogging.

  • 标签: 浸入式水口 水口堵塞 电磁搅拌 内流场 下模 多普勒测速仪
  • 简介:采用相变点测量、金相组织观察和力学性能测定,研究了不同正火温度对60mm厚Q345E钢板组织和性能的影响。结果表明:910℃×60min正火处理后,钢板组织更为均匀,晶粒更为细化,力学性能优越,达到国标要求。

  • 标签: Q345E 正火 厚板
  • 简介:应用Gleeble-3800热模拟试验机对E36-T板坯在700~1050℃温度区间进行了拉伸试验,绘出温度与断面收缩率的关系曲线,得出700~920℃为脆性区,因此矫直温度应避开此区间。利用扫描电镜断口观察和金相分析,确定不同温度区间塑性降低的原因。

  • 标签: E36-T板坯 热模拟 高温塑性 裂纹
  • 简介:本文介绍了运用VN微合金化技术生产高强韧性钢板Q460E的工艺,对其冶炼、轧制工艺进行了阐述,同时也对其它微合金技术生产这一产品的优缺点进行了对比,指出VN微合金化技术开发高强韧性钢板Q460E的优势所在,最终按照VN微合金化工艺进行试验,成功生产出合格的Q460E产品,将这一技术应用于工业生产,所生产的1200余吨产品也全部合格,成功解决了采用其它微合金化技术生产Q460级产品所存在的产品表面质量问题。

  • 标签: VN微合金化 Q460E 高强韧性钢板
  • 简介:Thecoilingtemperatureofthehotstriprollingprocessplaysanimportantroleinstripqualitycontrol.Thenewly-builtlaminarflowcoolingcontrolsystemwasindependentlydevelopedbyBaosteel.L2conductstotallydynamiccontrol(L1onlyexecutestheresultfromL2,anddoesnotconductanydynamiccontrol).Thesystemhasmanyadvantages,suchasquickreal-timecontrol,accuratemodelcalculation,quickresponseafterself-adaptation,etc.Comparedwiththe2050mmhotstriprollingline,thenewsystemcansatisfythestrictcoolingrequirementsofhighstrengthsteel,siliconsteelandheavyplatesbecauseofitsnewly-developedtechnologiesofcoolingratecontrol,stripcoolingbysectionsandproportion-integral-differentialcoefficient(PID)feedbackfuzzycontrol.

  • 标签: 薄片 冷却控制 炼钢技术 冶炼技术
  • 简介:Intwin-rollstripcastingprocess,transportphenomenaoffluidinthemoltenpooldirectlyaffecttheprocessstabilityandthequalityofproducts.Inordertoelucidatethefundamentaltransportphenomenaintwin-rollcasting,acommercialsoftwarecalledProCASTwasemployedtosimulatethetransientfluidflowandlevelprofilebehaviorsduringtheearlystageoftheprocessinthisstudy.Thecoupledsetofgoverningdifferentialequationsformass,momentumandenergybalanceweresolvedwiththefiniteelementmethodandthetransientfreesurfaceproblemwastreatedwithavolumeoffluids(VOF)approach.Theeffectofdifferentdeliverysystemsconfigurationonflowpattern,levelprofileinthepoolwasstudiedandanalyzedinthispaper.Thenewwedgemetaldeliverysystemshavebeenoptimizedforthetwin-rollstripcaster.Itwasshownthatnewtypemetaldeliverysystemshadapreferableeffectontheuniformdistributionoffluidandlevelfluctuationinthepool.Thesimulationresultsalsoprovideavaluablebasisfortheoptimizationofdeliverysystemandprocessparametersduringtheinitialpouringstage.

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  • 简介:Bymeansofthenumericalsimulationmethod,themathematicalmodelofinclusionsmovementinthemoldisestablishedundertheconditionofausteniticandferriticstainlesssteelslabproduction.Accordingtothesimulationresults,themainzonesforinclusionparticlesaccumulationwerefoundandmanyfactorsthataffectedfloating-upprobabilityofinclusionparticleswereidentified.Thesefactorsincludetheinclusionparticlesize,thecastingspeedandtheslabwidth,etc.Itisbelievedthattheinclusionparticlesizeisthekeyoneamongthesefactors.

  • 标签: 非金属夹杂物 连铸板坯 数值模拟方法 凝固 数学模型 生产条件
  • 简介:TheeffectofdeformationconditionsondynamicrecrystallizationbehaviorofNb,V,Timicroalloyedhigh-strengthstructuralsteelwasinvestigatedviahigh-temperaturesinglepassreductiontestsonaMMS-300thermomechanicalsimulator,withmathematicalmodelsestablishedforflowstressduringhotdeformation.Theresultsshowthatthedeformationresistancedecreaseswiththeincreaseoftemperatureandisinpowerfunctionrelationshipwiththetemperature.Meanwhile,itincreaseswiththeincreaseofstrainrateandisinlog-logrelationshipwiththestrainrate.Thedynamicrecrystallizationactivationenergyoftestedsteelwasdeterminedtobeabout329.55kJ/mol,295.31kJ/molatpeakandsteadystates.Thepredictionmodelsdevelopedforflowstressindicatedthattheyareingoodagreementwithexperimentalresults.

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  • 简介:Inparticulatematerialtransfersystems,traditionalsheartestbasedsteadystateanalysiscanprovidesomeinsightintothestrengthofthebulkmaterialandsubsequentresistivefrictionalforcesduringflow.Forfastflowingtransferpoints,dynamicflowconditionsdominateandadditionalmodellingtechniquesarerequiredtoimprovedesignguidance.Theresearchpresentedshowstheevolutionofadesignsolutionwhichutilisestwodistinctprocesses;acontinuummethodandadiscreteelementmethod(DEM).Initially,theinternalstructureofdensegranularflow,downverticalandinclinedpipeswasinvestigatedusingatwinsensor,12electrodeelectricalcapacitancetomographydevice.Subsequently,DEMsimulationswereconductedusingthecommercialsoftware,PFC3D.Initially,twoparticletypesandtheirflowbehaviourswereanalysed:plasticpelletsandsand.Thepipeanglewasvariedbetween0°and45°tothevertical.Forboththeplasticpelletsandthesand,goodqualitativeagreementwasfoundwiththespatialparticleconcentrationanalysis.Generally,theflowhadadenseparticleregionatitscorewiththeparticleconcentrationreducingawayfromthiscore.Asexpected,at0°,thecorewascentrallylocatedwithinthepipeforboththeplasticpelletsandsand.Atpipeangles5°orgreater,thedensecoreofparticleswaslocatedonornearthepipewall.Averageflowvelocityanalysiswasalsoconductedusingtheresultsofwallfrictiontestanalysis.ThevelocitycomparisonsalsoshowedgoodagreementbetweentheECTimageanalysisandtheDEMsimulations.Subsequently,theDEMmethodwasusedtoanalyseacomplextransfersystem(orchute)withthecontinuummethodprovidingcomparativeflowanalysiswiththeDEMflowanalysis.

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  • 简介:本文简述了酒钢HRB500E抗震带肋钢筋的研发过程,对其冶炼、轧制工艺做了较详细论述,给出试验结果,并就研发中存在的问题进行了分析。

  • 标签: HRB500E 抗震带肋钢筋 冶炼轧制工艺
  • 简介:介绍了南钢开发E36N高强船板的主要技术思路和关键工艺控制。通过对炼钢工艺的严格控制,得到了较高纯净度、内部质量较好的连铸坯;通过微合金化、合理的控轧控冷和正火工艺,得到了组织较细化的E36N钢板,具有优良的综合力学性能,满足供货要求。

  • 标签: E36N 高强度船板 控轧控冷 正火
  • 简介:通过对GK1E-3258机车水锤险肇事故处理过程的描述,分析了这起故障的特征及原因,给出了这类故障的判断、处理方法及预防措施。

  • 标签: 柴油机 水锤 示功阀 甩车 喷水
  • 简介:本文介绍了酒钢风电工程用Q345E中厚板的生产实践经验,主要对不同微合金化工艺及产品性能、生产过程中出现的问题、用户使用情况等做了较详细的说明。

  • 标签: 风电工程 Q345E 生产实践
  • 简介:分析总结了1720E浊度仪在综合废水处理站中用于废水监测方面的经验,并针对出现的问题提出了解决方案。

  • 标签: 1720E浊度仪 废水监测 应用