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Compiled by Hatem Zurob from works done at McMaster University and LTPCM by:

Investigation of the Transformation in Fe-C-X Alloys Using Decarburization. Compiled by Hatem Zurob from works done at McMaster University and LTPCM by: Gary Purdy, Jinichiro Nakano, Andre Phillion, Chris Hutchinson, Yves Brechet and Armand Beche. . Decarburization Method .

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Compiled by Hatem Zurob from works done at McMaster University and LTPCM by:

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  1. Investigation of the Transformation in Fe-C-X Alloys Using Decarburization Compiled by Hatem Zurob from works done at McMaster University and LTPCM by: Gary Purdy, Jinichiro Nakano, Andre Phillion, Chris Hutchinson, Yves Brechet and Armand Beche.

  2. Decarburization Method. • Summary of Results: • Fe-C • Fe-C-Ni • Fe-C-Mn • Fe-C-Cr • Fe-C-Mo • Fe-C-Si and Fe-C-Si-Mn • Fe-C-Nb • Future Work.

  3. T %C 1. The Decarburization Method

  4. T %C

  5. The rate of interface motion is given by: This differential equation has an analytical solution of the form:

  6. > Ternary Alloys: ParaEquilibrium Limit.

  7. > Ternary Alloys: LENP Limit.

  8. 2. Summary of Results: • 2.1. Fe-C (diffusion coefficient). • 2.2. Fe-C-Ni (the LE-NP limit). • 2.3. Fe-C-Mn (possible transition). • 2.4. Fe-C-Cr (solute drag). • 2.5. Fe-C-Mo (dissipation are not created equal). • 2.6. Fe-C-Si and Fe-C-Si-Mn (combined effects). • 2.7. Fe-C-Nb (precipitation).

  9. 2.1. Binary Fe-C System:

  10. 2.2. Fe-C-Ni Decarburization Experiments (ideal case) Phillion, Zurob, Hutchinson, Guo, Malakhov, Nakano and Purdy, Metall Trans., 35A, 1237-1242, 2004. Fe-0.51C 775°C Fe-0.50C-0.97Ni 775°C PE LE LENP Fe-0.50C-1.66Ni 775°C Fe-0.38C-1.03Ni 800°C PE PE LENP LENP

  11. 1.95% 2.85% Fe-Ni diffusion couple: 775oC for 4 min. 1.89 +/- 0.33

  12. 2.3. Fe-C-Mn Decarburization Experiments Fe-0.57C-0.94Mn (wt. %) 775°C PE LENP Temperature (oC) 755°C 725°C PE PE LENP LENP H. S. Zurob, C. R. Hutchinson, Y. Brechet and G. R. Purdy, PTM’05.

  13. 2.4. Fe-C-Cr Decarburization Experiments Fe-0.58C-1.99Cr (wt. %) 850oC A. Beche, senior thesis.

  14. 2.4. Fe-C-Cr Decarburization Experiments Fe-0.58C-1.99Cr (wt. %) 825oC

  15. 2.4. Fe-C-Cr Decarburization Experiments Fe-0.58C-1.99Cr (wt. %) 806oC

  16. 2.5. Fe-C-Mo Decarburization Experiments 825°C 775°C 806°C C. R. Hutchinson, H. S. Zurob and Y. Brechet, Met Trans A.

  17. 2.6. Fe-C-Si Decarburization Experiments Fe-0.58C-0.88Si (wt. %): 806oC

  18. Fe-0.58C-0.88Si (wt. %): 775oC

  19. Fe-C-Si-Mn Decarburization Experiments Fe-0.61C-0.58Mn-0.31Si (wt. %): 775oC

  20. 2.7. Fe-C-Nb Decarburization Experiments 0.035%Nb T (K) x 10-3 Wt fraction of C

  21. Martensite Ferrite 2.7. Fe-C-Nb Decarburization Experiments 806oC, 0.55%C, 0.035%Nb

  22. Summary

  23. 3. Future Work: • Search for Transition in Fe-Mn-C at high temperatures. • More detailed investigation of the quaternary Fe-C-Mn-Si. • One more temperature in Fe-C-Cr. • Question: If we use 775oC, will precipitation be a problem? • Denitriding of Fe-N-Cr down to 675oC. • Question: will denitriding be controlled by N diffusion? How can we check?

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