Numerical simulation of the evolution of primary and secondary Nb(CN), Ti(CN) and AlN in Nb-microalloyed steel during continuous casting
| Autor: | Krystina Spiradek-Hahn, Ernst Kozeschnik, Sabine Zamberger, Milan Pudar, Michael Reischl |
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| Rok vydání: | 2012 |
| Předmět: |
Materials science
Precipitation (chemistry) Metallurgy Metals and Alloys engineering.material Condensed Matter Physics Microstructure Carbide Continuous casting Dendrite (crystal) Transmission electron microscopy Phase (matter) Materials Chemistry engineering Microalloyed steel Physical and Theoretical Chemistry Composite material |
| Zdroj: | International Journal of Materials Research. 103:680-687 |
| ISSN: | 2195-8556 1862-5282 |
| DOI: | 10.3139/146.110688 |
| Popis: | The precipitation of carbides and nitrides in Nb-microalloyed steel is investigated experimentally and theoretically using light optical, scanning and transmission electron microscopy, and the thermokinetic software MatCalc. The simulations are based on a recently developed two-step methodology for precipitation simulation in primary solidification microstructures, where the compositional inhomogeneities from microsegregation are taken into account. The computed segregation is clearly evidenced in electron probe microanalyses of the as-cast microstructure. Based on the results of a Scheil–Gulliver simulation, precipitation kinetics simulations are performed with the chemical compositions corresponding either to the solute-rich interdendritic zone or the solute-depleted dendrite core zone. The predicted phase fractions, mean radii, number densities, and compositions of the precipitates are in good agreement with the experimental investigations. |
| Databáze: | OpenAIRE |
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