40Cr棒材不同显微组织的超声波衰减系数分析比较法

40Cr,,(,116023):,,,40Cr:;;;:TG115.28+5:A:100026656(2001)0420159203ANALYSISANDCOMPARISONOFULTRASONICATTENUATIONCOEFFICIENTSOF40CrCYLINDERSWITHDIFFERENTMICROSTRUCTURESLINLi,LIXi2meng,ZHANGJun2shan(DalianUniversityofTechnology,Dalian116023,China)Abstract:Themeasuringmethodoftheultrasonicattenuationcoefficientsofcylinderswasanalyzed.Moreover,theultrasonicattenuationswhichwerenotresultedfrommaterialswerestudiedundergivenconditions.Theultrasonicattenu2ationcoefficientsof40Crcylinderswithdifferentmicrostructureswereanalyzedandcompared.Keywords:Cylinder;Ultrasonicinspection;Attenuationcoefficient;Microstructure,,[1],,,,,,,40Cr11.1,:2000209204,MLRC=M+L+R+C(1)(1),,,L,RC,-(L+R+C)=ML,R,C,,M40Cr1.2,[2]1a,,95123420014NDTVol.23No.4Apr.2001©1995-2004TsinghuaTongfangOpticalDiscCo.,Ltd.Allrightsreserved.1(a)(b),[2],(1b),,=20lgB1B2-(L+R)2D(2)B1B2D,cm22.140Cr,D=500.5mm,L0=650.5mm,Ra=1.21.8m,,1140Cr1+(P+F)2(M)3+(M)2.22.5,510MHz,,V,(2kg),2,V(2),,2.3(1),D,LR,,l(3)C32.3.1D,B1/B2,;,B1/B2,[3]2.3.2LL36dB[2];,4Fe,(D=500.5mm),4Fe4nB=(D/a2)a061:40Cr©1995-2004TsinghuaTongfangOpticalDiscCo.,Ltd.Allrightsreserved.,2.3.3R(Z),RS,RB,,RB[2],RS,()2.3.4l,[3]2asin=(3),n,ln2nD=sin(4)(3)(4),ll2Dcaf(5)c,m/sf,Hz2.3.5CC,,Ra=1.21.8m,[4],,,,,,40Cr,,2.45f40Cr,f,,P+FMM,,f,PapadakisSAE4150640Cr540CrEPPapadakis,,[5],(a)P+F(b)M(c)M640Cr400(169)161:40Cr©1995-2004TsinghuaTongfangOpticalDiscCo.,Ltd.Allrightsreserved.//1999716,(5),3.3(a)(b)5,,(),,,198419864800,1994199610000199810,(4),,,,,,4,,,,:[1]GE.CFM256[Z].1997.[2].[J].,1997,(3):28.[3].[J].,1997,(3):25.(161)3,,,,,,,:[1]PapadakisEP.Physicalacousticsandmicrostructureofironalloy[J].IntMetRev,1984,29(1):1-23.[2]19,,.[M].:,1981.[3].ˆ“}[J].,1964,13(6):312-319.[4],.[M].:,1991.[5]PapadakisEP.Rayleighandstochasticscatteringoful2trasonicwavesinsteel[J].JofApplPhys,1963,34(2):265-269.961:©1995-2004TsinghuaTongfangOpticalDiscCo.,Ltd.Allrightsreserved.