Kinetics of inclusion precipitation during steel solidification
| Autor: | Jean Lehmann, Manuel Bobadilla, Philippe Rocabois, Henri Gaye |
|---|---|
| Rok vydání: | 1999 |
| Předmět: |
Supersaturation
Materials science Precipitation (chemistry) Metallurgy Metals and Alloys Nucleation Oxide chemistry.chemical_element Slag 02 engineering and technology 021001 nanoscience & nanotechnology 020501 mining & metallurgy chemistry.chemical_compound 0205 materials engineering chemistry visual_art visual_art.visual_art_medium Inclusion (mineral) 0210 nano-technology Tin Stoichiometry |
| Zdroj: | Steel Research. 70:356-361 |
| ISSN: | 0177-4832 |
| Popis: | The precipitation of non-metallic inclusions (complex oxides, sulphides, nitrides ...) during steel solidification is analysed using the multiphase equilibrium code CEQCS and a nucleation and growth model. The CEQCSI code is based in part on the Irsid slag model, and it provides an evaluation of the composition of inclusions formed at equilibrium, as well as guidelines for industrial treatments in order to reach desirable compositions in semi-killed steel grades. The nucleation and growth model can be applied to the formation, during steel solidification, of stoichiometric compounds or liquid oxide inclusions. Two particularities of this kinetic model are that nucleation and growth are treated simultaneously, and they compete in consuming the supersaturation at each moment, and that a mixed controlled growth model transport/interfacial kinetics at the precipitate/liquid steel interface is considered. The predicted size distribution of TiN precipitates formed in two steel grades is in good agreement with the results of laboratory experiments. In the case of liquid oxide precipitation, the lirst calculations indicate that the composition of inclusions can be significantly different from that of inclusions assumed to precipitate under equilibrium conditions. |
| Databáze: | OpenAIRE |
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