無取向電工鋼熱精軋相變及其對(duì)板形的影響研究

無取向電工鋼熱精軋相變及其對(duì)板形的影響研究無取向電工鋼熱精軋相變及其對(duì)板形的影響研究

摘要：在本文中，我們探討了無取向電工鋼熱精軋過程中相變的特征及其對(duì)板形的影響。首先介紹了無取向電工鋼的一般應(yīng)用以及熱軋、精軋等加工工藝，重點(diǎn)分析了熱軋過程中鋼材的組織變化和相變特征，并根據(jù)實(shí)驗(yàn)結(jié)果分析了精軋過程中產(chǎn)生的新的組織變化和相變特征。接著，我們?cè)敿?xì)闡述了熱軋溫度、保溫時(shí)間、冷卻方式等因素對(duì)無取向電工鋼晶粒組織和相變的影響，并對(duì)相變時(shí)鋼材內(nèi)部各成分的變化進(jìn)行了分析。最后，我們研究了精軋過程中硬度、力學(xué)性能、板形等因素與相變的關(guān)系，并探究了不同加工參數(shù)下產(chǎn)生的板形變化規(guī)律。

關(guān)鍵詞：無取向電工鋼；熱精軋；相變；板形；精度。

Abstract:Inthispaper,weexploredthecharacteristicsofphasetransformationinthehotprecisionrollingprocessofnon-orientedelectricalsteelanditsinfluenceonplateshape.Firstly,thegeneralapplicationofnon-orientedelectricalsteelandprocessingtechnologysuchashotrollingandprecisionrollingareintroduced.Thefocusisonthechangesofsteelmicrostructureandphasetransformationduringthehotrollingprocess,andthenewmicrostructurechangesandphasetransformationcharacteristicsduringtheprecisionrollingprocesswereanalyzedbasedonexperimentalresults.Then,weelaboratedtheeffectsofhotrollingtemperature,holdingtime,coolingmethodandotherfactorsonthegrainstructureandphasetransformationofnon-orientedelectricalsteel,andanalyzedthechangesofeachcomponentinsidethesteelduringphasetransformation.Finally,westudiedtherelationshipbetweenhardness,mechanicalproperties,plateshapeandphasetransformationduringprecisionrolling,andexploredthevariationlawofplateshapeunderdifferentprocessingparameters.

Keywords:non-orientedelectricalsteel;hotprecisionrolling;phasetransformation;plateshape;precisionNon-orientedelectricalsteelisanimportantmaterialusedintheproductionofelectricalmachines,transformersandotherelectricalequipment.Duringtheproductionprocessofnon-orientedelectricalsteel,hotprecisionrollingisacrucialstepthataffectsthequalityofthefinalproduct.Thephasetransformationandmicrostructurechangesthatoccurduringhotprecisionrollingsignificantlyaffectthemechanicalpropertiesandplateshapeofthesteel.

Thephasetransformationofnon-orientedelectricalsteelduringhotprecisionrollinginvolvesthetransformationofaustenitetoferriteandpearlite.Thistransformationisaccompaniedbychangesinthechemicalcompositionandmicrostructureofthesteel.Thechemicalcompositionofnon-orientedelectricalsteeltypicallyincludessilicon,aluminum,andcarbon,withvaryinglevelsofotherelementssuchasmanganese,sulfur,andphosphorus.Duringthephasetransformationprocess,thesteelundergoeschangesincrystalstructureandelementalcomposition,resultinginchangesinmechanicalpropertiessuchashardness,ductility,andstrength.

Thephasetransformationofnon-orientedelectricalsteelisdirectlyrelatedtotheplateshapeandmechanicalpropertiesofthefinalproduct.Theplateshapeisinfluencedbyanumberoffactors,includingtheprocessingparametersusedduringprecisionrolling,theinitialmicrostructureofthesteel,andthedegreeofdeformationduringrolling.Themechanicalpropertiesofthesteelarealsoaffectedbythesesamefactors,aswellasbythephasetransformationthatoccursduringrolling.

Tobetterunderstandtherelationshipbetweenphasetransformation,plateshapeandmechanicalpropertiesduringhotprecisionrollingofnon-orientedelectricalsteel,itisimportanttoanalyzethechangesthatoccurineachcomponentofthesteelduringthetransformationprocess.Bystudyingthesechangesindetail,itispossibletodevelopadeeperunderstandingofthemechanismsthatgoverntheproductionofhigh-qualitynon-orientedelectricalsteel,andtooptimizetheprocessingparametersthatareusedduringprecisionrollingDuringhotprecisionrollingofnon-orientedelectricalsteel,thesteelundergoesacomplextransformationprocessthatinvolvesanumberofdifferentphysicalandchemicalchanges.Thesechangesincludetheformationofnewphases,thegrowthandredistributionofexistingphases,alterationsincrystalstructureandgrainorientation,andchangesinmechanicalpropertiessuchasductilityandstrength.Inordertounderstandthesechangesandtooptimizetheproductionprocessforhigh-qualitynon-orientedelectricalsteel,itisimportanttobreakthemdownandanalyzeeachcomponentindetail.

Thetransformationprocessbeginswiththeheatingofthesteeltoahightemperature,typicallybetween1100and1300°C.Atthistemperature,thesteelisinafullyausteniticstate,meaningthatitconsistsentirelyofFCC(face-centeredcubic)crystalstructures.Asthesteelisintroducedtothehotrollingprocess,itundergoesanumberofphysicalchangesthataredrivenbyacombinationofheatandmechanicaldeformation.

Onekeychangethatoccursduringhotprecisionrollingistheformationofnewphasesinthesteel.Asthesteelisheatedanddeformed,itundergoesaprocessknownasrecrystallization,whichinvolvestheformationofnew,strain-freegrainsthatarefreeofdefects.Thisprocessiscrucialforproducinghigh-qualitynon-orientedelectricalsteel,asstrain-freegrainshavebettermagneticpropertiesthangrainsthatcontaindefectssuchasdislocationsandgrainboundaries.

Anotherimportantchangethatoccursduringhotprecisionrollingisthegrowthandredistributionofexistingphasesinthesteel.Asthesteelisdeformedandheated,thegrainswithinitundergochangesinsizeandshape,andmayalsobecomeelongatedorflattened.Additionally,certainphaseswithinthesteelmaybecomemoreconcentratedordispersed,leadingtochangesinmagneticandmechanicalproperties.Bycarefullycontrollingthesechangesandoptimizingprocessingparameterssuchasrollingspeedandtemperature,itispossibletoproducenon-orientedelectricalsteelwithhighlyuniformpropertiesandlowlevelsofmagneticanisotropy.

Finally,thehotprecisionrollingprocessalsohasasignificantimpactonthemechanicalpropertiesofthesteel.Asthesteelisdeformedandheated,itundergoeschangesinbothductilityandstrength,withtheformerincreasingandthelatterdecreasingasaresultofrecrystallizationandgraingrowth.Bycarefullycontrollingthesepropertiesandoptimizingrollingparameters,itispossibletoproducenon-orientedelectricalsteelwithhighlevelsofductilityandtoughness,aswellasexcellentmagneticproperties.

Inconclusion,thehotprecisionrollingprocessplaysacriticalroleintheproductionofhigh-qualitynon-orientedelectricalsteel.Bycarefullyanalyzingthechangesthatoccurineachcomponentofthesteelduringthetransformationprocess,itispossibletooptimizeprocessingparameters,improvemagneticproperties,andenhancemechanicalperformance.Additionally,ongoingresearchintotheunderlyingmechanismsofthiscomplexprocesscanleadtofurtheradvancementsintheproductionofnon-orientedelectricalsteel,ultimatelybenefitingindustriesrangingfrompowergenerationtoconsumerelectronicsOneareaofongoingresearchintheproductionofnon-orientedelectricalsteelisthedevelopmentofneworimprovedcoatings.Coatingsareappliedtothesurfaceofelectricalsteeltoimproveitsresistancetocorrosionandoxidation,aswellastoprovideinsulationbetweenindividualsheetsofsteelinamotorortransformercore.Currentcoatingstypicallyconsistofinorganiccompoundssuchassiliconoraluminumoxide,butthesematerialscanbebrittleandpronetocrackingordelaminationunderstressorhightemperatures.

Recenteffortsinthisfieldhavefocusedonthedevelopmentoforganiccoatings,whichoffergreaterflexibilityanddurability,aswellasthepotentialforimprovedmagneticproperties.Organiccoatingscanbederivedfromavarietyofsources,includingpolymers,resins,andcarbon-basedmaterials,andcanbetailoredtoprovidespecificpropertiessuchasimprovedadhesion,thermalstability,orelectricalinsulation.Whileorganiccoatingshaveshownpromiseinlaboratorytests,furtherresearchisneededtodeterminetheirlong-termperformanceinreal-worldapplications.

Anotherareaofinterestintheproductionofnon-orientedelectricalsteelistheuseofalternativemanufacturingprocesses,suchaspowdermetallurgyoradditivemanufacturing.Thesemethodsofferseveraladvantagesovertraditionalsteelmakingprocesses,includinggreatercontrolovermaterialcompositionandmicrostructure,aswellasthepotentialforreducedwasteandenergyconsumption.Powdermetallurgyhasalreadybeenusedtoproducehigh-performanceelectricalsteelswithimprovedmagneticproperties,andadditivemanufacturingtechniquessuchas3Dprintingarebeingexploredasawaytoproducecustomizedmagneticcomponentswithcomplexgeometriesandoptimizedproperties.

Overall,theproductionofnon-orientedelectricalsteelisacomplexandconstantlyevolvingfield,drivenbytheneedforhigh-performancematerialsinawiderangeofindustrialapplications.Ongoingresearchinthisfieldisfocusedonoptimizingexistingprocesses,developingne