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ID:32023468
大小:10.70 MB
页数:83页
时间:2019-01-30
《金属材料的高温蠕变特性-研究》由会员上传分享,免费在线阅读,更多相关内容在教育资源-天天文库。
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
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