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1、Int.J.FatigueVol.20,No.2,pp.145±154,1998Ó1998.PublishedbyElsevierScienceLtd.AllrightsreservedPrintedinGreatBritain0142±1123/98/$19.00+.00PII:S0142-1123(97)00098-4FailureanalysisandpreventioninSCCandcorrosionfatiguecasesKenjiroKomaiDepartmentofMechanicalEngineeri
2、ng,KyotoUniversity,606-01Yoshida-honmachi,Sakyo-ku,Kyoto,JapanFailurecasesconcerningstresscorrosioncracking(SCC)andcorrosionfatigue(CF)havebeensurveyed,andtheoveralltrendofthecasesandcorrectingmeasuresweresummarized.60%ofSCCoccurredinstainlesssteels,andspecialat
3、tentionshouldbepaidwhenstainlesssteels,aboveallausteniticstainlesssteels,areused.InmostcasesofSCC,residualstressinducedbyweldingandchlorideenvironmentwereimportant,andthetimetoSCCfailurewas1to2years.ThemostimportantcorrectivemeasureinSCCcaseswasmaterialchange.Ha
4、lfofthestresssourcesinCFcasesweremechanicalstress,butspecialattentionmustbepaidthattheremaining45%,whichwerecausedbyresonanceand/orvibrationandcyclicthermalstress.ThemostimportantcorrectivemeasureinCFcaseswasstructuralmodi®cationtolowerthestressconcentrationandd
5、esignstress.Ó1998ElsevierScienceLtd.(Keywords:failureanalysis;stresscorrosioncracking;corrosionfatigue)INTRODUCTIONThecharacteristicfeaturesofSCCcaseswithrespecttothematerialcategoryaresummarizedasfollows.CollectionsoffailurecasesandtheiranalysesperformWithcarbo
6、nsteels,anumberofcaseswerefoundintwotasks.Firstly,theyprovideapracticalopportunitypressurevessels,tubes,pipesandendplateofshells.toemploystateofthearttechnology.Secondly,theyMostlivestofailureswerelessthan2years,butancontributetofundamentalresearchactivitiesbyin
7、dicat-accidentoccurredafter10yearsuse.Asforenviron-ingunexpectedin¯uentialfactorsinlaboratoriesaswellmentalfactors,alkalineandhydrogenenvironmentareasdictatingthefuturetrendofengineeringresearch.concerned.ThecrackingwasfoundattemperatureThoughfailurecasescausedb
8、yenvironmentalfac-rangelowerthan50°Caswellastherange50±torsarewidespread,onlyasmallnumberhavebeen150°C.Mostofthestresssourceswereresidualstressespublished.Inthepresen
