Hot tear segregations as quality decisive factor for advanced steel ...

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Outline of presentation Advanced steel grades: A challenge for processmetallurgists Macro- and mesosegregation in continuous casting On the nature of hot tear segregations: Formation andconsequence on product quality Physical simulation of HTS-formation Numerical prediction of HTS-formation in slab casting:Concept and example SummaryHTS-Analysis of Casting Processes by Numerical and Physical SimulationBoundary conditionsHeat transfer (Mold)Measurement, ModelsCastingmachineLayout, steel grades,casting parametersPre-ProcessingThermophysicalpropertiesCATD-packagesHeat transfer(Secondary cooling)Nozzle measuring standMetallurgical modelse.g. Hot tearing:- Prediction of accumulated strain- Prediction of HTS-propability1D- and 2Dsolver,transientmodelsCommercialsoftwarepackagesPostprocessingPierer, R., S.C. Michelic and C. Bernhard: AISTech 2012, Atlanta, USA
Case study: slab casting of two steel grades, hard and soft coolingin the first secondary cooling zoneSteel AC Si Mn P S N Cr Ni0,17 0,43 1,54 0,015 0,007 0,0001 0 0Steel BC Si Mn P S N Cr NiSteel 0,15A; Hardcooling 0,015vs. Softcooling 1,109 0,008 0,007 0,0001 Steel B; 0Hardcooling 0vs. Softcooling120120Shell Thickness [mm]100806040Steel AShell Thickness [mm]100806040Steel B2020Stahl A - Hard - 0 MisAligStahl A - Soft - 0 MisAlig00,0 0,1 0,2 0,3 0,4 0,5 0,6 0,7 0,8 0,9 1,0Accumulated Strain [%]Stahl B - Hard - 0 MisAligStahl B - Soft - 0 MisAlig00,0 0,1 0,2 0,3 0,4 0,5 0,6 0,7 0,8 0,9 1,0Accumulated Strain [%]PRICM8 Bernhard 25Outline of presentation Advanced steel grades: A challenge for processmetallurgists Macro- and mesosegregation in continuous casting On the nature of hot tear segregations: Formation andconsequence on product quality Physical simulation of HTS-formation Numerical prediction of HTS-formation in slab casting:Concept and example Summary
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