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,(,100022):Q235,5N14;,:;;;;:TG115.28:A:100026656(2002)0920391204ULTRASONICNONDESTRUCTIVEEVALUATIONOFTHEGRAINSIZEOFLOWCARBONSTEELCHENJian2zhong,SHIYao2wu(SchoolofMaterialsScienceandEngineering,BeijingPolytechnicUniversity,Beijing100022,China)Abstract:TherelationshipbetweenthevelocitiesofultrasoniclongitudinalwavesandtheaveragegraindiametersoflowcarbonsteelQ235wasstudied.Thegrainsizesoftestpartswerechangedbyheattreatment.Theresultsindicatedthatthereexistedfairlygoodlinearitybetweenthegrainsizesandlongitudinalwavevelocitieswhenthemeasurementsweredonewith5N14probeandthegrainsizeofalowcarbonsteelcouldbeevaluatedwhenproperprobeandfrequencywereselectedtomeasurethevelocityoflongitudinalwaves.Keywords:Ultrasonicinspection;Grainsize;Lowcarbonsteel;Ultrasonicprobe;Velocity(),,,,,,,,,Burkle[1]Kopec[2],,:2001209219:(50075004);(2962004)[3],,,;,[4],Ambardar[5],,Smith[6],,,2,,Nicoletti[7],Lott[8]Wang[9],20%[10],19324920029NDTVol.24No.9Sep.2002©1995-2004TsinghuaTongfangOpticalDiscCo.,Ltd.Allrightsreserved.Wang[9],Palanichamy[10]Ambardar[5],,Ahn[11],Lorentz(EMAT)Q235,,5N14,Q2351Q2351025mm25mm90mm1,,,1Q235minmin185045610004529006071000753900120810506049504591050120595012010105024022.1,,,5N14,5MHz,37MHz,20mm20mm80mm20mm20mm,A20MHz,,,,1,1NE1,NE4,L,f,vv=2L(4-1)f(NE4-NE1)(1),,2.5P20,2.5MHz,24MHz2.2,,,L,NM,ŠD[12]ŠD=1.75NLM(2)22mŠDŠDŠDŠD184.264176.77278.910351.32107.15213.88293.33126.46233.39322.92.325N14,y=kx+b(3)kb293:©1995-2004TsinghuaTongfangOpticalDiscCo.,Ltd.Allrightsreserved.23(a)(b)(c)(d)2Q2355N14Q2355N14,,,,1mm,3km/smmbmkm/smmbm1-70.61505918.93-64.03595920.72-20.61435916.94-83.77305924.36080m/s2b,,[9,10]32.5P20,,;,10MHz,,,,Q235,(a)(b)3Q2352.5P20393:©1995-2004TsinghuaTongfangOpticalDiscCo.,Ltd.Allrightsreserved.,,,,,,,,1,,,3(1)5N14Q235,,,,1mm,6080m/s(2)2.5P20,,Q235:[1]BurkleWS.Measurementofultrasoniclongitudinalwaveattenuation[J].MaterialsEvaluation,1984,42(3):262-263.[2]KopecB,HanakV.Usingultrasonicattenuationmea2surementstoinvestigateanomaliesinthestructureofrail2wayaxles[J].NDTInternational,1984,17(5):265-268.[3],.[J].,1980,2(4):26-28.[4],.[J].,1982,4(2):1-7.[5]AmbardarR,MuthuMT,PathakSD,etal.Effectofporosity,porediameterandgrainsizeonultrasonicatten2uationinaluminumalloycastings[J].INSIGHT,1995,37(7):536-543.[6]SmithRL.Theeffectofgrainsizedistributiononthefrequencydependenceoftheultrasonicattenuationinpolycrystallinematerials[J].Ultrasonics,1982,20(5):211-214.[7]NicolettiD,AndersonA.Determinationofgrain2sizedis2tributionfromultrasonicattenuation:transformationandinversion[J].JournaloftheAcousticsSocietyofAmeri2ca,1997,101(2):686-689.[8]LottLA,MalikRK.Ultrasonicinspectabilityimprove2mentsinaustenitestainlesssteelweldsafterthermal2me2chanicalprocessing[J].MaterialsEvaluation,1983,41(5):738-742.[9]WangW,RokhlinSI,LippoldJC,etal.Relationshipbetweenultrasonicmeasurementsandmicro2structuralcharacteristicsoftype308stainlesssteelwelds[J].Ma2terialsEvaluation,1989,47(12):1388-1395.[10]PalanichamyP,JosephA,JayakumarT,etal.Ultra2sonicvelocitymeasurementsforestimationofgrainsizeinausteniticstainlesssteel[J].NDT&EInternational,1995,28(3):179-185.[11]AhnB,LeeSS,HongST,etal.Applicationofthea2cousticresonancemethodtoevaluatethegrainsizeoflowcarbonsteels[J].NDT&EInternational,1999,32(2):85-89.[12].[D].:,1990.2003,,,,16,5.00,30:42407,,:357:200090:0212656871212254,216:021265680330://CYJI.chinajournal.net.cn:[e-mail]493:©1995-2004TsinghuaTongfangOpticalDiscCo.,Ltd.Allrightsreserved.