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连铸小方坯横向裂纹的测定技术.docx

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连铸小方坯横向裂纹的测定技术 Title:DeterminationTechniquesforTransverseCracksinContinuousCastingBillets Abstract: Continuouscastingisanessentialprocessinthesteelindustry,producingsemi-finishedproductssuchasbilletsthatareusedinvariousdownstreamprocesseslikerollingandforging.Thequalityandintegrityofthesebilletsareofutmostimportance,asanydefectscansignificantlycompromisethestructuralintegrityandmechanicalpropertiesofthefinalproducts.Transversecracksincontinuouscastingbilletsareonesuchdefectthatcanleadtocatastrophicfailureduringsubsequentprocessing. Thispaperaimstoreviewanddiscussthevariousdeterminationtechniquesusedtodetectandmeasuretransversecracksincontinuouscastingbillets.Thetechniquescanbebroadlyclassifiedintonon-destructivetesting(NDT)anddestructivetestingmethods.Bothqualitativeandquantitativetechniqueswillbecoveredtoprovideacomprehensiveunderstandingofthetopic. 1.Introduction -Backgroundoncontinuouscastingprocessandthesignificanceofbilletquality -Overviewoftransversecracksincontinuouscastingbilletsandtheirimpact 2.Non-DestructiveTestingMethods 2.1.VisualInspection -Visualinspectionisthesimplestandmostbasictechniqueusedtodetecttransversecracks -Discussthelimitationsandchallengesassociatedwithvisuallyinspectingbillets 2.2.UltrasonicTesting(UT) -PrincipleandworkingofUTtechniqueindetectingtransversecracks -DifferenttypesofUTsuchaspulse-echoandthrough-transmissiontechniques 2.3.EddyCurrentTesting(ECT) -PrincipleofECTanditsapplicationinidentifyingtransversecracks -AdvantagesofECT,suchashighsensitivityandrapidinspectionspeed 2.4.MagneticParticleTesting(MPT) -IntroductiontoMPTanditssuitabilityfordetectingsurfacediscontinuities,includingtransversecracks -Typesofmagneticparticlemethods,suchasdrypowderandwetsuspensiontechniques 3.DestructiveTestingMethods 3.1.Metallography -Explanationofmetallographictechniques,includingsamplepreparationandmicroscopicexamination -Detailedanalysisoftransversecracksusingmetallography 3.2.TensileTesting -Conductingtensiletestsonbilletspecimenstoevaluatethei