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Improvement of reduced activation 9%Cr steels by ausforming

Hoffmann, J.; Rieth, M.; Commin, L.; Fernández, P.; Roldán, M.

Abstract (englisch):
Forimprovedperformanceofthecomponentsinafusionreactor,anincreasedapplicationtemperatureforstructuralmaterialssuchas9%Crreducedactivationsteelsiscrucial.Theimprovementofthecurrentgenerationof9%Crsteels(i.e.EUROFER)isoneoftheaimsofthecurrentEUROfusionprogrammeforadvancedsteels.Thegoalofthisworkistodeterminethemosteffectivethermo-mechanicaltreatmentofreducedactivationferriticmartensiticsteelswithrespecttohigh-temperaturestrength.Compatibilityofthesetreatmentswithindustrialproductionprocessesisessential.Inthepresentstudy,twodifferentbatchesofEUROFER-2werepreparedwithathermo-mechanicaltreatment.Thematerialsweresolutionannealedat1250°Candthenslowlycooledtotherollingtem-perature,whichwasvariedbetween600and900°C.Hot-rollingwasperformedintheausteniteregimewithasubsequentrapidcoolingtoformtheferritic-martensiticstructure.Thecharacterizationofthematerialswasdoneinas-rolledstateandafterasubsequenttemperingat750°C.ThematerialscharacterizationwasperformedbytensileandCharpyimpacttestsusingminiaturizedspecimens.Themicrostructurewascharacterizedbyscanningelectronmicroscopy(SEM)backscatterim-agesandelectronbackscatterdiffraction(EBSD)maps.Alltheresultswerecomparedtothoseofconven-tionallyprocessedEUROFER-2alloys.Thefirstresultsshowagainintensilestrengthofapproximately50MPaattemperaturesabove600°CcomparedtoconventionallytreatedEUROFERalloys.Microstructuralinvestigationsrevealafineandhomogeneousdistributionofthemartensiticlaths,whiletheprioraustenitegrainsareaboutoneorderofmagnitudelarger.Thiscanbeexplainedbytheexceptionallyhighaustenitizationtemperaturecomparedtotheas-receivedstate.

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Volltext §
DOI: 10.5445/IR/1000064243
Originalveröffentlichung
DOI: 10.1016/j.nme.2015.12.001
Scopus
Zitationen: 19
Coverbild
Zugehörige Institution(en) am KIT Institut für Angewandte Materialien - Angewandte Werkstoffphysik (IAM-AWP)
Publikationstyp Zeitschriftenaufsatz
Jahr 2016
Sprache Englisch
Identifikator ISSN: 2352-1791
urn:nbn:de:swb:90-642433
KITopen-ID: 1000064243
HGF-Programm 31.40.03 (POF III, LK 01)
Erschienen in Nuclear materials and energy
Band 6
Seiten 12–17
Schlagworte Fusion; EUROFER; Thermo-mechanical treatment Creep strength; Mechanical properties
Nachgewiesen in Scopus
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