循环氢压缩机组主汽轮机轴失效分析

:1999212230;:2000205208:,,1976,11122(11100083)(21125001),,,.TG17219A1002-6495(2001)0120060203FAILUREANALYSISOFTURBINEAXESOFACIRCULATORYHYDROGENCOMPRESSORDONGChaofang1,LIXiaogang1,CHENHua1,YANGLi2,WANGHanjun2(11UniversityofScienceandTechnologyBeijing,Beijing100083)(21ResearchInstituteofJinXiRefinery,Jinxi125001)ABSTRACTThefailureofaturbineaxeswasinvestigatedbysclerometer,opticalmicroscopy,SEM,andmechanicsanalyses.Ithasbeenfoundthatthesurface-machiningnick,whichresultedinstressconcentration,whichinducedinitiationandgrowoffatiguecracks,andfinallyruptureoftheaxes.Ac2cordingtotheexperimentresults,measurestopreventthefatiguefailurehavebeensuggested.KEYWORDSturbineaxes,fatigue,fracture,failureanalysis,,1581m/min,370,3.2MPa.,,245mm(120mm70mm),1.,,,.1.3248MPa,[1]:HV0.3S(1)b(MPa)0134HV(2)S970MPa,b1127MPa.,[2],,,.CrMoMn,SCM2230CrMoA.,,,.1,3:(a)()45:(b)90(,,;(c),.Fig.1Themicrographyoffailedpiston13120011CORROSIONSCIENCEANDPROTECTIONTECHNOLOGYVol113No11Jan12001,,(1),.45,(a)45.,[3].190,,,[3].,.(2),.3.a,b,.ab,,.Fig.2SEMmorphologysurfacemachiningnick(46),,..,,,(45).4520mm,,,45,.(),,,.,(),.2.,.2114,:P1;T;P2,,2194105N,P1=2194105N.L=R2-R1,H,2R1.,:=5119MPa,1=7814MPa.[3]:Fig.3SEMmorphologyoffatiguestriationinthefractureextendedarea.(a)9,(b)8161:Fig.4Thestresssketchmapofturbineaxes=21+42=13013MPa(3)212Goodman[4],(-1)(S)(b)[5]:-1=0125(S+b)(4)S970MPa,b1127MPa,,Sb.,S539MPa,b=784931MPa.S=833MPa,S=931MPa.-1=441MPa.213(Kt)[2]:Kt=/(5)[2]:Kt=d[bdctg(dd)](6)-(0.01mm);b-(0.04mm);d-(0.02mm).Kt10.7.,,.(r)(m)(Kf),Kf=r/nr=1+q(Kt-1)(7),q,q[2]q=0.3.:Kf=4.21.441MPa10418MPa.,m10418MPa,3040MPa.,74%,,,.,,,.214,,.8MPa,55,75cm.[6]:CH=APH2e-H/RT(8)A1,H5732cal,0.35.D02.010-3cm2/s,xt:t=x2/D0(9)33d,,.,,,,.3:,;,;:,,.:1..:,1987.2,,..:,1988.3..:,1992.4..:,1988.5,,..:,1987.6..:,1988.2613