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1、Tr.J.ofEngineeringandEnvironmentalScience23(1999),389{401.cTUB¨ITAK_OntheCreepStrength-RuptureDuctilityBehaviourof1.25Cr-0.5MoLowAlloySteelMehmetDEMIRKOL_FacultyofMechanicalEngineering,IstanbulTechnicalUniversity,_G¨um¨ussuyu80191,Istanbul-TURKEY_Received
2、23.12.1998AbstractItisimportanttoselectmaterialshavingbothhighstrengthandgoodductilityinmostengineeringapplications.Thisisalsotrueforhightemperatureproblemsandtherequirementofhighcreepstrengthaswellashighruptureductilityisofprimeconcern.Thecreepdataofferri
3、ticlowalloy1.25Cr-0.5Mosteel,whichisextensivelyusedinpipingsystemsoffossilpowerplants,hasshownlossofruptureductilityaftercertainexposuretimedependingonitsinitialmicrostructureandappliedstress.Thisunexpectedlossofductilityiscalledasruptureductilitytrough,an
4、dthisstudycoverstheattemptstoinvestigatethedependencyofcreepruptureductilityof1.25Cr-0.5Mosteelonmicrostructureandstress,inthetemperaturerangeof773-923K.Anempiricalrelationshipinexponentialcharacterwasdevelopedtopredicttherupturetimeleadingtoruptureductili
5、tytrough,dependingontemperatureandtheinitialstructureofsteel.Finally,aruptureductilitymapwasconstructedforeachsteelinvestigatedinthisstudy,inordertopresentrupturestrength-ruptureductilitydatainamoreappropriateway.KeyWords:LowAlloyFerriticSteel,RuptureDucti
6、lity,CreepStrength,RuptureDuctilityTrough,RuptureDuctilityMap.D¨us¨ukAlasml1,25Cr-0,5MoCeligininS¨ur¨unmeDayanmveS¨unekligiDavransUzerine¨Ozet¨Bircokm¨uhendislikuygulamasnday¨uksekdayanmves¨unekligibirliktesaglayanmalzemelerinsecimi¨oneml
7、idir.Budurumy¨uksekscaklkproblemleriicindegecerliolup,y¨ukseks¨ur¨unmedayanmves¨unekliginesahipmalzemelerinseciminedikkatedilmektedir.Ozellikletermiksantrallarnborusistemlerindeyaygn¨olarakkullanlanferritikved¨us¨ukalasml1.25Cr-0.5Moceligi
8、,uygulanangerilme,scaklkveicyapyabaglolaraks¨ur¨unmes¨unekligindebeklenmeyend¨us¨uslerg¨osterebilmektedir.Bucalsmada¨oncelikles¨ozkonusuceliklerdeg¨or¨ulenveS¨ur¨unmeS¨unekligiOluguolarakisimle
