简介：Newformssteelisfewandfarbetween.InthislectureIwillillustratethreediscoverieswhichhavethepotentialofmakingsignificantnewcontributionstotheapplicationsofsteelasanengineeringmaterial.Oneofthesediscoveriesdealswiththefirsteverbulknanostructuredmetalwhichcanbemadeonalargescale,cheaplyandwithpropertieswhicharesuperiortocarbonnanotubes.Thesecondisahighlyformablesteelwhosepropertiesarenotmatchedbyanyavailabletoday.Andthethird,aweldingmaterialwhichisdesignedtotransforminsuchawaythatresidualstressesareeliminatedfromjoints.

简介：Tubehydroformingtechnologyhasshowntheattentionoftheautomotiveindustryduetoitsadvantagesoverconventionalstampingandweldingmethods.Inthisstudy,thetubehydroformingprocessincludingtubebending,preformingandhydroformingprocessforanautomobilesubframeisanalyzedanddesignedbythesimulationsoftwareAutoFormofafiniteelementmethod(FEM)program.Aparametricstudyiscarriedouttoobtaintheeffectoftheformingparameterssuchasinitialtubesizeandloadingpathonthe...

简介：Withtheextensivelywideapplicationofadvancedhighstrengthsteels(AHSS)invariousfieldsfortheexcellentmechanicalproperties,theindustrialinterestonthedamageofAHSSisincreasingintherecentyears.Forthesemodernsteels,duetothecomplexmicrostructureandtherelevantdeformationmechanisms,thedamageconceptneedstobereexamined.Inthispaper,thedefinition,lengthscaleanddifferentmechanismsofdamageareintroduced.Bothexperimentalevaluationofdamageandthenumericaldamagemodelsarebrieflyviewedandcompared.Theapproachestoimprovethedamagetolerancearegivenintheframeworkofdamagetolerancedesignprinciple.

简介：Thisstudyresearchescoldrolledultrahighstrengthmartensiticsteelprocessedbywaterquenching.Itisfoundthatboththequenchingandoverageingtemperaturesgreatlyinfluencethemechanicalpropertiesofmartensiticsteel.Atensilestrengthof1500MPacanbeobtainedfrom0.2%C-1.8%Mnsteelbysoakingat840℃,quenchingat700℃andoverageingat200℃forseveralminutes.Thecontinuouscoolingtransformation(CCT)diagramrevealsthatfullmartensitecanbeobtainedatacoolingrateof100℃/sorhigher;andatacoolingrateof3-10℃/s,austenitebarelydecomposesat700℃.Forsteelwith0.2%carbonandlessmanganese,austenitedecompositionoccursbeforeitiscooledto700℃atacoolingrateof3-10℃/s,whichleadstolowertensilestrength.Itispossibletoreducethemanganesecontentofthe1500MPamartensiticsteelbyincreasingthequenchingtemperature.Toincreasethequenchingtemperature,thecontrolofflatnessduringwaterquenchingbecomesamajorconcern.

简介：AccordingtothecharacteristicsofPQFcontinuousrollingpass,therelationshipbetweenspreadcoefficient,wallthicknesscoefficientandelongationareanalyzed.Thesectionshapeoftubeineachstandoutlet,theefficientworkingradiusandtherotationalspeedofeachrollareobtained,therefore,thepassparametricdesigniscompleted.Athermal-mechanicalcoupledmodelofcontinuousrollingtube’sformingprocessisestablishedbythethree-dimensionalelasto-plasticfiniteelementmethod,thesectionshapeandareaoftubeineachstandoutletareforecasted,whichisusedtomodifythepass.Therollingforceofeachrollerispredicttoo,whichprovidesaguidanceforpassdesign.Inaddition,avisualsoftwareofPQFpassparametricdesignsystemonheavycalibreseamlesstubeisgeneratedwithVisualBasic.Theformingdimensionoftubeandtherollingforceofeachrolleraresuccessfullyobtained,bysimulatingtheformingprocessofacertainseriesheavycalibreseamlesstube.Thissystempossespracticalutilizationvalue.Byusingthissystem,thedevelopmentcycleofnewproductcanbeshortened,thereliabilityofpassdesigncanbeimproved,andtheenergyconsumptionofrollingmillandproductioncostcanbedecreased.

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简介：Thefirstdomestically-integratedlarge-scaleairseparationunit(ASU)withacapacityof60000m3/hwassuccessfullybuiltandputintooperationatBaosteel.Comparedwiththeelectricaldesignoftheimportedequipmentofthesametype,thisASUhasanelectricalprotectioninterlinkthatisindependentfromthedistributioncontrolsystem(DCS).Withthedesignideaofsimplicity,theASUfeaturesasimplifiedconfigurationandanaudioalarmsystemforelectricalfailures.Ithelpsreducethefailurerateoftheelectricalequipmentanddetectfailuresquicklyandaccurately.Itwilleffectivelyenhancesafeandstabilizedproduction.TheASUcannotonlyreducethecostofinvestment,butalsoensureasmoothandstablerunningofthewholeelectricalequipment.Thisstudyfocusesontheexperienceandunderstandingoftheunitdesignandcommissioning.