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1、AcceptedManuscriptFailureanalysisofagasturbinenozzleZ.Mazur,A.Hernandez-Rossette,R.Garcia-Illescas,A.Luna-RamirezPII:S1350-6307(07)00152-5DOI:10.1016/j.engfailanal.2007.10.009Reference:EFA937Toappearin:EngineeringFailureAnalysisReceivedDate:2August2007RevisedDate:8October2007
2、AcceptedDate:12October2007Pleasecitethisarticleas:Mazur,Z.,Hernandez-Rossette,A.,Garcia-Illescas,R.,Luna-Ramirez,A.,Failureanalysisofagasturbinenozzle,EngineeringFailureAnalysis(2007),doi:10.1016/j.engfailanal.2007.10.009ThisisaPDFfileofanuneditedmanuscriptthathasbeenaccepted
3、forpublication.Asaservicetoourcustomersweareprovidingthisearlyversionofthemanuscript.Themanuscriptwillundergocopyediting,typesetting,andreviewoftheresultingproofbeforeitispublishedinitsfinalform.Pleasenotethatduringtheproductionprocesserrorsmaybediscoveredwhichcouldaffectthec
4、ontent,andalllegaldisclaimersthatapplytothejournalpertain.ACCEPTEDMANUSCRIPTFailureanalysisofagasturbinenozzleZ.Mazur,A.Hernandez-Rossette,R.Garcia-Illescas,A.Luna-RamirezInstitutodeInvestigacionesEléctricasAv.Reforma113,Col.Palmira62490Cuernavaca,Morelos,MéxicoTel:52-777-362
5、3811Fax:52-777-3623834E-mail:mazur@iie.org.mx1ACCEPTEDMANUSCRIPTFailureanalysisofagasturbinenozzleAbstractThefailureanalysisofthe70MWgasturbinefirststagenozzlemadeofcobalt-basealloyFSX-414ispresented.Thenozzleexperiencecracksindifferentvaneairfoilsectionsassistedbybasealloyde
6、gradationduetoanoperationathightemperature.Adetailedanalysisofallelementswhichhadaninfluenceonthefailureinitiationwascarriedout,namely:decreasingofalloyductilityandtoughnessduetocarbidesprecipitationingrainboundaries;graingrowing(coarsening)andvaneairfoilstresslevel.Itwasfoun
7、dthatthevanecrackinitiationandpropagationwasdrivedbythermalfatiguemechanism.Thevanecrackinitiationandpropagationwereduetofatiguemechanismwhichwasfacilitatedbygrainboundariesbrittlenesscausedbyformationofcontinuousfilmofcarbidesongrainboundaries,grainscoarsening,andhighthermal
8、stresslevel.Keywords:Failureanalysis;Thermalfatigue;Gasturbinefailur
