金属材料的高温蠕变特性-研究

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1、太原理工大学硕士研究生学位论文Ⅳ匝TALMATERIALOFHIGH—TEMPERATUI之ECREEPCHARACTEIUSTICSI之ESEARCHABSTRACTInthepetrochemical，metallurgy，machineryandotherindustries，alargenumberofmetalcomponentsundertheconditionsofhightemperature，highpressure，strongcorrosive，oncethesebearingmemberaccidentaldamagewillleadtodisastrousconseq

2、uencesandcausehugeeconomiclosses．Therefore，thesafetyandreliabilityoftheequipmentmustbeputforwardhigherrequirements．Andlong-termhightemperature，highpressure，thesebearingmemberwillfaceaspecialchallenge--high-temperaturecreep．Forexample，forthestainlesssteelpipelong-termworkunderhigh—temperature，hi．ghpr

3、essure，creepbehaviordeterminesthelifeofthepipelineanditssafetyandreliability．Butduetotheorganization，chemicalcompositionandthermalphysicalpropertiesbetweenthemetalmaterialstherearelargerdifferences，SOdifferentkindshavedifferentcreeppropertiesofsteel．Forexample，betweenthecreepperformanceoflowalloyste

4、elandstainlesssteelisabigdifference．Sothestudyofmaterialhightemperaturecreeppropertyisparticularlyimportant．Atpresent，thecreepcharacteristicsofcreepteststudyandfiniteelementnumericalanalysisoftwo．Themostcommonlyusedtestmethodistheuniaxialcreeptensiletest．Butbecauseofitslimitations，researchersalsopro

5、posed¨Cryo—Cracking”method，microsampletechnology，anewmethodtosolvetheuniaxialtensilecreeptensiletestingsupplies，demandingspecimenpreparation，butstilltime—consuming．Incomparison，thefiniteelementanalysisisnotonlylow—cost，short—consuming，highprecision，andhasasolidtheoreticalfoundation．III太原理工大学硕士研究生学位论

6、文Therefore，IusethecommonlyusedsteelofhighstrengthlowalloysteelQ345Randausteniticstainlesssteel304twochemicalindustryastheresearchobject，throughthefiniteelementanalysissoftwaretosimulatethehi曲temperaturecreeppropertiesofthem．Thespecificcontentsareasfollows：1．Theuseofmetalmaterialsviscoelasticmechanic

7、alanalysisofhigh-temperaturecreepofbothsteelanditscomponents．Gettheviscoelasticconstitutiveequationsofthetwokindsofmetalmaterialsanditscomponents2．Throughthefiniteelementmodelofthetwomaterials，obtaine