简介:Thedependencesofradiationinduceddefectsonirradiationtemperatureupto700℃at15dpaandonirradiationdoseupto85dpaatroomtemperaturehavebeeninves-tigatedbytheheavyionirradiationandthepositronannihilationlifetimespectroscopyfortheCLAM.Avoidsizepeakisobservedat~500℃wherethevacancyclustercontains9vacanciesandhasanaveragediameterof0.59nm.Thesizeofthevacancyclustersincreaseswiththeincreaseofirradiationdoseatroomtemperature,andthevacancyclusterat85dpaconsistsof9vacanciesandreachesasizeof0.60nmindiameter.TheabsolutevaluesofthevoidsizeatthepeakandtheincreaseofvoidsizewithdoseintheCLAMsteelarenegligiblecomparedtothoseofthenormalstainlesssteels,indicatingthattheCLAMsteelhasgoodradiationresistantproperty.
简介:微观结构变化的特征被XRD和TEM分析的使用与亚稳的奥氏体为钢(ZG0Cr13Mn8N)在麻蚀(CE)期间调查。结果证明标本的表面层的微观结构由α'-martensite,组成在CE前的亚稳的奥氏体和一些ε-马氏体。CE显然在表面上增加脱臼密度和直或平面的脱臼,并且导致γ->ε,ε->α'和γ->α'马氏体的转变。
简介:ReviewonthedevelopmentofrefractoriestechnologyinChina'sironandsteelindustryduringtheperiodof"theninthfive-yearplan"hasbeenmade.Somesugges-tionsandopinionsonthefuturedevelopmentofrefractoriesscienceandtechnologyinChinahasbeenputforward,includingfullutilizationofdomesticrichresourcesofrefrac-toryrawmaterialstodevelopsophisticatedsyntheticrefrac-toryrawmaterialswithChinesecharacteristicsandtheR&Donhigh-techrefractoryproductsformeetingtherequire-mentofthedevelopmentofnewmetallurgicaltechnology.
简介:High-strengthsteelshavebeenattractingmoreandmoreattentionofpeople,Unfortunately.deteriorationofductilitylimitedtheirapplications.Tosolvethisproblem,anano-structuredstainlesssteelsheetisdevelopedtocombinehighstrengthandhighductility.Processingofthesurfacemechanicalattritiontreatment(SMAT)wasintroducedtoobtainanano-grainlayeronthedoublesurfaceofthestainlesssteelsheet.Themicrostructureofthenanostructuredsteelsheetischaracterizedbyanalternatedistributionofcoarsegrainedlayerandnanocrystallinelayer.Thenthedualsurfacenano-crystallizedstainlesssteelsheetswereco-warmrolledat500℃.Theexperimentalresultsrevealthatthemechanicalpropertiesofthenanostructuredsteelexhibithighyieldstrengthintherangeof700-950MPaandtensilestrengthhigherthan930MPa.Moreover,elongationtofracturereachesto15%-48%,togetherwithauniformelongationstabilizedto13%-45%.
简介:Electropulsing-inducedrecrystallizationanditseffectonmechanicalpropertiesoforientedsiliconsteelstrips(Fe-3.0%Si)werestudiedbyopticalmicroscopy,scanningelectronmicroscopyandelectronback-scatterdiffraction.Theresultsindicatedthatelectropulsingacceleratedrecrystallization,anddecreasedthetemperatureofrecrystallization.Electropulsingfavorsrefinementofthegrainstructureofthealloy.Effectsofelectropulsingonstrengthandelongationofthealloywerediscussedfromthepointviewofdislocationdynamics,microstructuralchanges,andelectropulsingkinetics.
简介:Shakingtabletestsofa1:10scalearchmodelperformedtoinvestigatetheseismicbehaviorandresistanceofconcretefilledsteeltubular(CFT)archstructuresaredescribedinthispaper.TheEl-CentrorecordandShanghaiartificialwavewereadoptedastheinputexcitation.Theentiretestprocesscanbedividedintothreestagesdependingonthelateralbraceconfigurations,i.e.,fully(five)braced,twobracesremoved,andallbracesremoved.Atotalof46tests,startingfromtheelasticstatetofailurecondition,havebeenconducted.Thenaturalvibrationfrequencies,responsesofacceleration,displacementandstrainweremeasured.Fromthetestresults,itisdemonstratedthattheCFTarchstructuresarecapableofresistingseveregroundmotionsandthatCFTarchesofferacrediblealternativetoreinforcedconcretearches,especiallyinregionsofhighseismicintensity.
简介:ThereareabundantnaturalgasresourcesinwesternChina,butmanyoilandgasfieldsarerichinchloridion,sulfuretedhydrogen,carbondioxideandothercorrosivemedium,whichhavestrongcorrosivitytopipeline.Onegasfieldpossessesabundantnaturalgaswithgreatpressure,andthechloridionconcentrationinthewaterseparatedfromgasisabout10%,sothemediumhasgreatcorrosivity.Inordertoensurethesafetyofthepipeline,about13kmlengthpipelineandtheinternalpipesofagastreatmentplantthatpurifiesgasabout12billioncubicmeterayeararemadeof2205duplexstainlesssteel(2205DSS).2205DSShasmanycharacteristicsinweldingwithcomplexweldingprocess;andbecauseofhighqualityrequirementsfortheconstructionofnaturalgaspipelineandrestrictionofon-siteconditions,thesiteweldingisverydifficult.Aroundtheengineeringapplication,alargenumberofexperimentalresearcheshavebeencarriedoutonthematerialmicrostructure,propertiesandweldability.Finallyweldedjointswhichconformtotherequirementsofstandardareobtained,contributingtothefirstlarge-scaleapplicationofthismaterialinthefieldofoilandgaspipelines.Consideringtheengineeringapplicationandthelatestresearchdevelopment,theweldingandkeyfactorsaffectingthejointpropertiesof2205DSSpipesaresummarizedandanalyzed.
简介:SeveralkindsofslidenozzleplatesuchasAl2O3-C-ZrO2,MgO,Al2O3,Spinel-CandAl2O3-CSNplateforhighoxygensteelusedinBaoSteelhavebeenanalysed,theappearanceandsizeoftheSNplateafterusinghavebeenmeasured.TheAl2O3-CSNplatehaslongerservicelifeincastinghighoxygensteel,andthewearmechanismofdifferentSNplatesisdiscussed.
简介:Steelhasbeenusedasatraditionalwheelmaterialsforalongtime.Before1980’s,over90%wheelsweremadeofsteels.Then,theyieldstrengthofwheelsteelsincreasedgraduallyfrom240-350MPato600MPaorhigher.Theadvancedhighstrengthsteelsbecomethemainwheelmaterials.Since1990’s,DP600hasbeenbroadlyappliedinsteelwheelsoversea.However,therewaslittleresearchofapplicationofhighstrengthsteelwheels(especiallywheeldisc)indomesticwheelindustrial.Inpresence,DP600steelwheelisonlydevelopedinFAWSHbyusingimportedCKD.OtherdomesticsteelwheelmanufacturersdidlittleworkonhighstrengthDP600wheeldiscs.BaosteelwheelsCo.Ltd.isthefirstdomesticcompanyproducingDP600steeldiscsandhasbecometheleadingcompanyinproductionofhighstrengthwheel.BecauseofthehighstrengthofDP600,itsformability,springback,andwrinklehavebecomethekeysofthesuccessfulapplicationofDP600steel.Inthispaper,themetallurgicalandmechanicalpropertiesarefirstlyintroducedandformationproblemsofDP600aredescribedcomparedtotraditionalsteels.Secondly,FLDanalysishasbeendone.Wrinkleandmorespringbackarerecognized.Tosolvetheseproblems,anoptimizedsolutionisdesignedandthegoodresultisobtained.ThetesthasshownthatthefatiguepropertyofsteelwheeldiscsmadebyDP600havebeengreatlyimproved.
简介:Sinceithasexcellenttensilestrength,thequenchingandpartitioning(Q&P)treatedsteelhasbeenwidelyacclaimed.SomeresearchediscurrentlybeingconductedonQ&Psteel,butQ&Ptechniquesandrelatedmechanismshavebeenmostlyresearchbasedonconventionaltransformation-inducedplasticity(TRIP)steel.ThisstudyresearchestheeffectofMnonthepropertiesofQ&Psheetsteel.TwokindsofsteelsheetwithdifferentlevelsofMncontent(1.46%Mnand2.75%Mn)areinvestigated.Afterbeingfullyannealed,thesteelsheetswerequenchedtoatemperaturebetweenMsandMf.Allocationtreatmentthencausedthecarbontobepartitionedintotheremainingaustenite.Themicrostructureandtensilepropertieswereanalyzed.TheresultsshowthattheincrementofMncontentcanincreasethestabilityofthesteelanddecreasethesensitivityofthequenchingtemperature(QT).TheresultsalsoindicatethatincreasingthelevelofMncaneffectivelysuppresstheformationofbainite.
简介:Themicro-characteristicsofthestreakymarksandthecorrespondingsubstratesurfaceofgalvannealed(GA)steelsheetshavebeeninvestigatedusingSEMandFIB.Thestreakymarkareaseemstohavemanycavities,similartocraters,whichscatterlightandmakethesurfaceappeardarkerwhencomparedwiththesurroundingnormalarea.Moreover,itisfoundthattheirregularityordifferenceinsteelgrainsizetendstoaffectthesurfacequalityoftheGAsteelsheets.Duringalloying,thediffusionspeedofZn-Feonthegrainboundaryisfasterthanthatatthecenterofthegrain,whichresultsintheselectiveformationofcrater-likemorphologyinthecoatingareawithlargersteelgrains.DuetothecleargrainboundaryofIFsteel,apparentstreakymarkswillbeformedonthecoatin,iftheIFsteelsurfaceconsistsofrainsofirreularsize.
简介:Thispapershallshowaneconomicfeasibleapproachtoimplementgreenhousegas(GHG)reductionmeasuresintosteelcompanies.ThegoaltoimproveenergyconsumptionisdirectlylinkedtothereductionofGHGemissionsandthereforedirectlyincorrelationwiththeeconomicviability.Abaselinescenariooftheconsideredreferencesystemandoftherespectivereferenceyearhastobedefined,mappedandanalysed.Inasecondstepananalysisofthesameoperationusingavailableandprospectedbestavailabletechnology(BAT)processesiscarriedouttogenerateabasisforabenchmarksystem.TheidentifiedreductionpotentialsarereportedandtheGHGemissionreductionsareputintorelationtotheinvestmentcostofthenewprocesstechnologies/processadaptiontobeimplemented.ThiseconomicfeasibilitycalculationisnecessarytorealiseacostefficientGHGreductionroadmapimplementationintothecompany’sbusinessoperations.TheGHGreductionroadmapisdevelopedusingtheabatementcurveconcepttogetanindicationof'lowhangingfruits'andforestablishingasequenceforimplementingcarbonemissionreductionsmeasures.ThescopeofthatapproachcanbeextendedbyincludingfurtherimportantenvironmentalparameterslikeNOx,SO2,CO,dust,heavymetalemissionsinairaswellasproductionresidues.ThatgivesintheendabroaderpictureandmorestartingpointstoimprovetheoverallenvironmentalperformanceofsteelproducingcompaniesbeyondtheGHGemissionsandenergyconsumption.
简介:Problemsencounteredintheproductionoflownickelausteniticstainlesssteelhavebeenstudied.Theseproblemsprimarilyincludethechangestothemicrostructureoftheslabduringtheheatingprocess,theformationandremovalofdeformation-inducedmartensiteduringcoldrolling,andtheeffectsoftheannealingprocessonthesurfaceoxidestructure.Areasonablemanufacturingprocesshasbeenproposedonthebasisoftheresearchresultsandhighqualitycold-rolledstripsoflownickelausteniticstainlesssteelhavebeenproduced.
简介:Thesurfacetreatmenttechnologycanimprovethecorrosionresistanceofsteelsheetsandincreasethevalueofsteelapplication.ThesurfacetreatedsteelsheetsinBaosteelincludezincgalvanizedsteelsheets,singalvanizedsteelsheets,chromiumgalvanizedsteelsheets,andcolourcoatingsteelsheetswiththeapplicationintheareafromconstructiontoautomobiles,appliance,package,etc.Thedevelopment,applicationandmanufacturingtechniqueoftheseproductshavebecomethecorecompetitionpowerofBaosteel.ThearticlereviewsthedevelopmentsofsurfacetreatedsteelsheetsandsurfacetreatmenttechnologiesinBaosteelin10years,especiallyhotdipgalvanizedhighstrengthsteelproductsusedinvehicles.ThearticlealsolooksforwardintofurtherdevelopmentsofsurfacetreatmentsteelproductsandtechnologiesinBaosteel,whichwillfocuson:①thenewproductsofhotdipgalvanizedadvancedhighstrengthsteels;②moreenvironmentalfriendlyproductsorfunctionalcoatingproducts;③thedevelopmentofsurfacetreatmenttechnologiestomeettherequirementofhighersurfacequalityinthemarcket;④newtypeofsurfacetreatmentandcoatingtechnologies.
简介:GlowdischargeplasmanitridingofAISI304austeniticstainlesssteelhasbeencar-riedoutfordifferentprocessingtimeunderoptimumdischargeconditionsestablishedbyspectro-scopicanalysis.ThetreatedsampleswereanalysedbyX-raydiffraction(XRD)toexplorethechangesinducedinthecrystallographicstructure.TheXRDpatternconfirmedtheformationofanexpandedaustenitephase(γN)owingtoincorporationofnitrogenasaninterstitialsolidsolu-tionintheironlattice.AVickersmicrohardnesstesterwasusedtoevaluatethesurfacehardnessasafunctionofindentationdepth(μm).Theresultsshowedclearevidenceofsurfacechangeswithsubstantialincreaseinsurfacehardness.