Improvement of reduced activation 9%Cr steels by ausforming
Hoffmann, J. 1; Rieth, M.
1; Commin, L. 1; Fernández, P.; Roldán, M.
1 Karlsruher Institut für Technologie (KIT)
1; Commin, L. 1; Fernández, P.; Roldán, M.1 Karlsruher Institut für Technologie (KIT)
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.
| Zugehörige Institution(en) am KIT | Institut für Angewandte Materialien – Angewandte Werkstoffphysik (IAM-AWP) |
| Publikationstyp | Zeitschriftenaufsatz |
| Publikationsjahr | 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) Materialentwicklung |
| Erschienen in | Nuclear materials and energy |
| Verlag | Elsevier |
| Band | 6 |
| Seiten | 12–17 |
| Schlagwörter | Fusion; EUROFER; Thermo-mechanical treatment Creep strength; Mechanical properties |
| Nachgewiesen in | Scopus Dimensions |
| Globale Ziele für nachhaltige Entwicklung |