On the Impact of Microsegregation Model on the Thermophysical and Solidification Behaviors of a Large Size Steel Ingot
Abstract
:1. Introduction
2. Microsegregation Models
- Straight liquidus and solidus lines of the concerned phase diagram (i.e., a constant partition coefficient k connecting the slope of solidus and liquidus together);
- A constant diffusion coefficient;
- A plate-like or cylindrical dendrite geometry;
- A single phase in the solid (an abrupt occurrence of δ-ferrite/γ-austenite transformation);
- A parabolic () or linear local solid/liquid interface advance velocity ().
3. Material and Methods
3.1. Experimental and Modeling Processes
3.2. Determination of Fourier Number α
3.3. Determination of Thermodynamic Properties
4. Results and Discussions
4.1. SDAS and Back-Diffusion Parameter
4.2. Impact of Microsegregation Model on Thermophysical Properties
4.3. Impact of Microsegregation Model on Solidification Behavior
5. Conclusions
Author Contributions
Funding
Acknowledgments
Conflicts of Interest
References
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Microsegregation Model | Solute Concentration at the Solid/Liquid Interface ωS | Solid Fraction fS |
---|---|---|
Lever Rule | ||
Scheil-Gulliver Model | ||
Brody-Flemings Model | ||
Clyne-Kurz Model | ||
Kobayashi-Ohnaka Model |
Steel/Regions | C | Si | Mn | S | Cr | Mo | P | Ni | Fe |
---|---|---|---|---|---|---|---|---|---|
Nominal | 0.36 | 0.4 | 0.85 | 0.0023 | 1.82 | 0.45 | 0.01 | 0.16 | Balance |
Region 1 | 0.37 | 0.4 | 0.86 | 0.001 | 1.92 | 0.44 | 0.013 | 0.17 | Balance |
Region 2 | 0.38 | 0.4 | 0.86 | 0.001 | 1.93 | 0.45 | 0.014 | 0.17 | Balance |
Region 3 | 0.44 | 0.42 | 0.86 | 0.001 | 1.89 | 0.44 | 0.015 | 0.17 | Balance |
Region | TS (°C) | TL (°C) | d2 (μm) | tf (s) | α |
---|---|---|---|---|---|
1 | 1428.5 | 1493.1 | 366 | 509 | 10.57 |
2 | 1426.5 | 1492.8 | 474 | 1017 | 12.60 |
3 | 1414.2 | 1486.7 | 536 | 1307 | 12.66 |
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Zhang, C.; Jahazi, M.; Isabel Gallego, P. On the Impact of Microsegregation Model on the Thermophysical and Solidification Behaviors of a Large Size Steel Ingot. Metals 2020, 10, 74. https://doi.org/10.3390/met10010074
Zhang C, Jahazi M, Isabel Gallego P. On the Impact of Microsegregation Model on the Thermophysical and Solidification Behaviors of a Large Size Steel Ingot. Metals. 2020; 10(1):74. https://doi.org/10.3390/met10010074
Chicago/Turabian StyleZhang, Chunping, Mohammad Jahazi, and Paloma Isabel Gallego. 2020. "On the Impact of Microsegregation Model on the Thermophysical and Solidification Behaviors of a Large Size Steel Ingot" Metals 10, no. 1: 74. https://doi.org/10.3390/met10010074