奥氏体不锈钢的应力腐蚀-研究

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1、大连理工大学专业学位硕士学位论文AbstractItisanurgencyprojectofdevelopmentalstudyingwhichismechanicalequipmentofpetrochemicalproduction，especiallythestresscorrosionofpressurevessel，seekinganeffectivemethodofprotectingequipment，extensionofuselife．Thecharacterstatementstheprotectioncountermeasuresof

2、mechanicalequipmentsofthestresscorrosionthroughchemicalequipmentfortheeffectsofstresscorrosioncrackingmechanismandtheresearchandanalysis．TheresultsofanalysishavesomeguidingsignificanceforensuringChemicalequipmentsmoothoperationofthesafety，Improvetheequipmentservicelifetime，improve

3、thelevelofequipmentplaysanimportantroleinOperationandManagement，atthesametime，thechemicalequipmentdesign，materialselection，manufacturingandprocessing．Characterandcauseofthecrackingaccidentofausteniticstainlesssteelpipeteejointconnectedwithdeemphasizingcolumnwasstudied．Theresultssh

4、owedthattheruptureisTrancrystallinecleavagecrackingbyhydrogenembittermentbasically，i．e．catholicstresscorrosioncracking．Hydrogenconvectionovenintotheoverheatedroomabovethemainreasonsforcrackingfurnacetubeasfollows：theexistenceofmediumionCI，weldingnormstoohot(sensitiveareaofthelarge

5、r,highervalueofresidualstress)，theuseofnon-Ti，Nb，etc．elementsofthestabilizationofsingle．phasetype18-8austeniticstainlesssteelpipesandSOon．HydrogenFurnaceTubescrackintofocusonthefirstpossessionofthesmallheatshouldringarea(sensitizationlargerareasandresidualstressregion)，aC1ionstres

6、scorrosioncracking．TowerofmethaneexportsfromthreepiecesofbrokenpipecausedbyhydrogenembittermentessentiallyTrangranularcleavage—typecrack,thatis，typeofstresscorrosiondamagetothecathode．Itiscausedbyfollowingfactorsmainly：solutionheattreatmentathightemperatureWaSnotperformedaRerformi

7、ng，SOthatabove30％austeniticstructureof18-8typemetstable．m-奥氏体不锈钢的应力腐蚀研究austeniticstainlesssteelweretransformedintomartensiteS1bmctIll．e．Mediumwithoutthedesulphurizationformethane，withmoreH2S；ahigherresidualstress，organizationalstressandstressconcentration；materialdefects，iSthemain

8、reasonfortheaboveproblems．朋1reeli