学科分类
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35 个结果
  • 简介:Sprayingtestwereconductedtwicebeforesteelslabswereputintothefurnaceandtheeffectsoftheoxidationresistancecoatingwereinvestigatedandverified.Bycomparingthechangeofslabweight,rollingforceoftheroughingmill&finishingmill,thicknessofoxidefilmonthesurfaceslabsbyanXL-30SEMandacidpicklingspeedofslabswithandwithoutcoating,itwasfoundthattheoxidizationwasteinthefurnacedecreasedby40percentwiththeuseofthecoatingandthecorrespondingyieldcapacitycouldincreaseby0.2percentatleast.Besides,thethicknessofoxidescalefilmonhotrolledproductswasreducedby1.44micrometersandtheacidpicklingtimewasshortenedby6swiththecoatingtechnology,whilethetotalrollingforceofRM&FMdidnotchanged.Furthermore,theapplicationprospectofthistechnologywasalsodiscussedinthispaper.

  • 标签: 工业性试验 涂层技术 耐氧化性 喷雾试验 轧制力 粗轧机
  • 简介:Inthisstudy,theformabilityoftransformation-inducedplasticity(TRIP)steelisstudiedduringdeep-drawingprocesseswithpreforming.Theeffectsofpreformingontheminimumthicknessofcanareinvestigatedwithaconstitutivemodelaccompanyingstrain-inducedmartensitetransformationinprestraincondition.TheconstitutivemodelhasbeenimplementedintoABAQUS/UMATforanalysisofTRIPsteel-formingprocesses.TheresultsshowthatpreformingslightlyinfluencesthethicknessuniformityofTRIPsteel...

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  • 简介:Themicro-characteristicsofthestreakymarksandthecorrespondingsubstratesurfaceofgalvannealed(GA)steelsheetshavebeeninvestigatedusingSEMandFIB.Thestreakymarkareaseemstohavemanycavities,similartocraters,whichscatterlightandmakethesurfaceappeardarkerwhencomparedwiththesurroundingnormalarea.Moreover,itisfoundthattheirregularityordifferenceinsteelgrainsizetendstoaffectthesurfacequalityoftheGAsteelsheets.Duringalloying,thediffusionspeedofZn-Feonthegrainboundaryisfasterthanthatatthecenterofthegrain,whichresultsintheselectiveformationofcrater-likemorphologyinthecoatingareawithlargersteelgrains.DuetothecleargrainboundaryofIFsteel,apparentstreakymarkswillbeformedonthecoatin,iftheIFsteelsurfaceconsistsofrainsofirreularsize.

  • 标签: 晶粒尺寸效应 遗传标记 IF钢 基板 合金化热镀锌 表面质量
  • 简介:Withthecontinuousimprovementofproductqualityandfunction,thequalitycontrolofmoldsteelisbecomingincreasinglystricter.Argonprotectionisessentialforensuringcastingqualityduringingotcasting.Thedevelopmentofargonprotectioniningotcastingandtheproductionprocessofenclosedargonprotectionin40tlineisdiscussed,withparticularfocusgiventhefactorsaffectingtheflowofoxygenintheargonprotectioncoverarediscussed.Theinfluenceofsomerelatedfactorsontheoxygencontentisanalyzed.Onthebasisoftheonlinemeasurementsoftheoxygencontent,theoptimizedoperationalapproachesforimprovingtheeffectofargonprotectionaredeveloped.Thiscandecreasetheliquidsteelviasecondaryoxidation,andimprovethequalityoftheingots.

  • 标签: 氩气保护 铸坯 行为 产品质量 质量控制 铸件质量
  • 简介:TheeffectofaustenitedeformationonthepearlitemicrostructureofeutectoidsteelwasinvestigatedbyhotuniaxialcompressiontestsusingaGleeble1500thermo-mechanicalsimulator.Theresultsshowedthatthedeformationoftheaustenitephaseacceleratedthetransformationofpearlite,leadingtoasmallercolonysizeandasmallerinterlamellarspaceofpearlite;meanwhile,theorientationofpearlitelamellaebecamemoreheterogeneous,andthelamellarthicknessdecreased.Largerstrainofaustenitewasobservedtoacceleratethespheroidizationprocessofcarbideswithinpearlitecolonies.

  • 标签: 珠光体组织 热轧变形 共析钢 显微组织 单轴压缩试验 热模拟试验机
  • 简介:High-strengthsteelshavebeenwidelyappliedtoautomotivechassisparts.Inordertoformcomplexshapes,highholeexpansionratesandhighformabilityarerequired.Dualphase(DP)steelhasagoodformability,butapoorholeexpansionrate.Inthiscircumstance,anotherkindofsteelwhichhasamicrostructureofferrite-bainite,ratherthanferrite-martensite,hasbeenfoundtobeanalternativesolution.ItiscalledFBsteel.ThissteelwithSi,CandMnadditionsareappliedinthisstudy.Atwo-stepcooling...

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  • 简介:Aplate'sinternalqualityisverycritical,especiallyforboilersandhigh-pressurevessels.Theultrasonictest(UT)isthemaintypeofnon-destructiveflawdetectionforheavyplates,whichisimportantbecauseoneofthemainreasonsforplatedefectsisultrasonicflaws.Thisstudy,basedonBaosteel'spracticalexperienceinthemanufactureofheavyplates,elucidatesthecauseofdefectformationbyanalyzingultrasonicflawtestingmapsandusingspecialequipment,suchasthescanningelectronmicroscope,electronprobeandtheopticalmicroscope.Theauthorputsforwardthefollowingimprovementmeasures:①Ultrasonicflawsarecausedbycentralporosityandsegregation,[H]bubblesandinclusioninslabs.②Ultrasonicflawsaremorelikelytooccurinthebottomandtopofslabsratherthantheotherpositionsinthecastingsequence.Itisclearthatone-quarteroftheinnercamber'sthicknessisaccumulatedinclusion.③Itisclearthatoverheatinginthetundishandtheflowofthecastingmouldhaveaneffectonultrasonicflawscausedbyinclusions.④Softreductionimprovescentralporosityandsegregation,whichdecreasesthenumberofultrasonicflawsintheplate.

  • 标签: 连续浇铸程序 缺陷检测 重型板 炼钢技术
  • 简介:Ore-cokemixedchargingisapotentialtechniqueforoptimizingthechargingpattern.Recently,thechargingofsmall-sizedcoke(nutcoke)withtheferrousburdenlayerhasbeenappliedtoreducerawmaterialusageanddecreasecosts.Variousstudiesindicatethatmixingnutcokewithferrousburdencanenhancethereductionkinetics,improvethesofteningandmeltingproperties,andhaveapositiveeffectonthepermeability.Althoughmixedcharging,especiallytheadditionofnutcoketotheburdenlayer,hasbeenusedintheindustryforvariousreasons,themechanismsandsideeffectsforusingnutcokearenotwellunderstood,andthemixingratioremainslimitedinactualblastfurnaceoperation.High-temperatureexperimentalstudieswereconductedtoincreasetheunderstandingofthecomplexprocessofreduction,softeningandmeltingproperties,andpermeabilityinablastfurnacewhenmixingnutcokewithanorelayer.Theeffectofthenutcokemixingratioandnutcokesizewasinvestigatedundervariousreducingconditions.Todescribethereductionprocessesofburdenmaterials,numerousexperimentswereinterruptedatdifferentstagesofthereduction,andthecollectedmaterialswereexaminedbyusingimageanalysis.Thereductiondegreeofmixedcharging(ironoremixingwithnutcoke)wasimprovedwhenusingnutcokeatthetemperaturesof800℃andabove.Thereactionrateofore-nutcokemixedchargingwashigherthanthatofstandardchargingwithouttheuseofnutcoke.

  • 标签: 炼铁高炉 坚果 还原行为 充电模式 材料用量 熔融特性
  • 简介:Thisstudyexaminesmechanismsforprovidingnucleitoequiaxedgrainsintheweldsofpureferriticstainlesssteel(FSS).TheadditionofthealloyelementTitopureFSS439causestheprecipitationofTiN,whichcanbenefitthecolumnar-to-equiaxedtransition(CET)ofgastungstenarcwelding(GTAW).Meanwhile,theinitialmorphologyoftheprecipitates,theconcentrationmultiplicationsofTi,N,etc.ofFSS439shouldbecontrolledtoinducetheformationofCETduringtheshortweldingprocess.

  • 标签: 铁素体不锈钢 等轴晶 不锈钢焊接 晶形 FSS
  • 简介:ThehotrollingexperimentinvestigatesintotherelationshipbetweenthemicrostructuresandthemechanicalpropertiesofNb-TimicroalloyedsteelswithvariousTicontents.TheresultsindicatethattheeffectofthebainitefractionofNb-TimicroalloyedsteelsontheyieldstrengthofthesteelsisnotrelatedtoTicontent,whiletheslopeoftheHall-PetchrelationshipdecreaseswiththeincreaseofTicontent.Accordingly,theMisramodelfortheyieldstrengthofNb-Timicroalloyedsteelsismodified,andthefactorswhichcausethechangeintheslopeofHall-Petchrelationshiparediscussed.

  • 标签: 微合金化钢 屈服强度 钛含量 铌钛 力学性能 微观组织
  • 简介:Theeffectofannealingtreatmentonthemicrostructuresandmechanicalpropertiesofcold-sprayedNicoatingwasinvestigatedbyconductingmicro-hardnessandtensiletestsandusinganormalopticalmicroscope(OM),ascanningelectronmicroscope(SEM),atransmissionelectronmicroscope(TEM)andanelectronprobeX-raymicroanalyzer(EPMA).Theresultsshowthatfollowingtheincreaseoftheannealingtemperature,themicro-hardnessofcold-sprayedNicoatingdecreasesandtheelongationafterfractureincreases,whilethetensilestrengthincreasesbeforedecreasing.Thetensiledeformationandfracturebehaviorchangefromatypicalbrittlefracturetoahybridbrittleandductilefracture,thentoatypicalductilefailure.Itisfoundthatwhenannealedatanelevatedtemperature(e.g.900℃),thegrainstendtogrowabnormallywiththeoxidesspheroidizingandthedefectsagglomeratingattheinterfaces,causingthetensilestrengthreductionofthecold-sprayednickelcoating.Itisalsopointedoutthatthetensilestrengthofthecold-sprayedNicoatingcanbesignificantlyimprovedbytheappropriateannealingprocedures,buttheelongationafterfracturecannotbeclearlyincreasedbecauseitisdifficulttoeliminatethemaindefectsinthecoatingbythefollowingheattreatments.

  • 标签: 退火处理 力学性能 显微组织 冷喷涂 镍层 扫描电子显微镜
  • 简介:Textureevolutionofhigh-manganesetwining-inducedplasticity(TWIP)steels(Fe-16Mn-0.6C)duringcold-rollingisstudiedbymeansofquantitativeorientationdistributionfunction(ODF)analysis.Thicknessreductionsofthespecimensduringcold-rollingare10%,20%,30%,50%and65%,respectively.EvolutionoftextureisoftheBrasstype,whichistypicalforlow-stackingfaultenergy(SFE)materials.Thecontributionofdeformationtwinningtothedevelopmentoftextureisclearlyillustratedbythemonotonici...

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  • 简介:Cold-rolledmartensiticsteelsheetsproducedoncontinuousannealinglineswithwaterquenchingfacility,haveadvantagesofhighstrengthandlowalloyingelementcontents.Theseareingoodaccordancewiththetrendoflight-weightingandfuelsavingforautomotivesteel.Inthisarticle,acold-rolledmartensiticsteelisstudiedtoinvestigatetheeffectofannealingparametersonitsmechanicalproperties.Itisfoundthatthequenchingtemperatureandtheslowcoolingspeedaswellastheoverageingtempe...

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  • 简介:Thechargingpatternmayaffectblastfurnacepermeability,cokeratio,andthefreedomtoselectlow-graderawmaterials.Ore-cokemixedchargingisapotentialtechniqueforoptimizingthechargingpattern.Inrecentyears,chargingsmall-sizedcoke(nutcoke)intotheburdenlayerhasbeenappliedtosaverawmaterialsanddecreasecost.Althoughmixedcharging,especiallyaddingnutcokeintotheburdenlayer,mayhavemanyadvantages,themechanismsandsideeffectsofnutcokeusearenotwellunderstood,andthemixingratioisstilllimitedinindustrialblastfurnaceoperation.Inthisstudy,thestatusofmixedcharging,especiallynutcokeusedinblastfurnaces,wasinvestigated.Acoldflowmodelwasestablishedtostudythepermeabilityofthepackedbedintheblastfurnace"dryzone"underdifferentconditionswiththeaimofbetterunderstandingthemechanismsofmixingcokeandnutcokeintotheburdenlayer.Theeffectofcokesize,mixingcokeratio,layernumbers,andgasflowrateonthepressuredropofthepackedbedwasinvestigated.Theexperimentalresultsshowthatmixingthenutcokeintheorelayersdecreasesthepressuredroptodifferentextentsdependingonmixingratio.

  • 标签: 焦炭填充床 螺母 高炉 实验 透气性 混合比例
  • 简介:TheeffectofCe,LaandmischmetalonthesolidificationstructureofFe-36Niinvaralloywasinvestigated.Theresultsshowthatgreatamountsofhigh-meltingpointcompounds(Ce2O3,La2O2Sand(Ce,La)2O2S)respectivelyformedinthealloywiththeadditionofCe,Laormischmetal.Basedonthetheoryoflatticemisfit,thelatticemisfitbetweenthe(0001)surfacesofCe2O3,Ce2O2SandLa2O2Sand(100)surfaceofFe-36Niinvaralloywere6.21%,5.77%and5.42%,respectively,whicharerelativelylow.Therefore,Ce2O3,La2O2Sand(Ce,La)2O2Scouldserveasthecoreofheterogeneousnucleation,improvetheequiaxedgrainratio,reducetheequiaxedgrainsizeandrefinethesolidificationstructureofalloy.

  • 标签: 因瓦合金 混合稀土 凝固组织 非均质形核核心 催化能力 晶格失配
  • 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:Abstract:Inordertounderstandtheeffectofthesolidificationstructureontheformabilityofultralowcarbonferriticstainlesssteel(FSS),thisworkstudiestheridgingphenomenonandthedeep-drawingpropertyindetailandtheresearchmethodwasX-raydiffraction(XRD)andscanningelectronmicroscope(SEM)technique.Theresultshowsthatthecolumnargrainspecimenhadahigherridgingheightthantheequiaxedgrainspecimen,whichwasmainlyattributedtotheformationofgraincoloniesinthecolumnargrainspecimen.Afterfinalrecrystallizationannealing,theequiaxedgrainspecimenobtainedahigh-intensityγ-fibertextureandanexcellentdeep-drawingproperty.

  • 标签: 铁素体不锈钢 深冲性能 凝固结构 超低碳 起垄 扫描电子显微镜
  • 简介:Recrystallizationtextureofsteelplateisaffectedbysubstitutionsolidsolutionandinterstitialsolidsolution.Thisarticlefinishedtexturetestandstampingtestaboutlowcarbonaluminiumkilledsteel,IFsteel,phosphorusstrengthensteel,Si-Mn-Pstrengthensteel.Itcanbefoundthatallkindsofsteelhassimilarintensity{111}textureinpermanentφ=45°aboutlevel10.Interstitialsolidsolutionsteelhad{101}textureandsubstitutionsolidsolutionsteelhad{112}texture.Basedonrecysstallizationprincipleandstampingtest,theeffectofsolutiononrecrystallizationtextureisdiscussed.Itpointoutthatinterstitialsolidsolutionimpediment{111}textureformingandcausedto{101}textureremainedinsteel.Thephenomenonstrengthenanisotropicpropertyandreductionstampingproperty.Similartosubstitutionsolidsolution,itwouldimpediment{111}texturetoo,but{101}texturechangedto{112}texture.

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