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The growth of acicular ferrite in Fe-Mn Annika Borgenstam

The growth of acicular ferrite in Fe-Mn Annika Borgenstam. Fe - 0.92, 1.81, 3.67, 5.54, 7.60 mass% Ni Fe – 0.99, 1.98, 3.92, 5.66 mass% Cr Fe – 0.71, 1.69, 2.60, 5.46 mass% Mn Fe - 0.27, 0.51, 1.00, 2.00 mass% V Fe - 0.5, 0.99, 2.01, 3.01 mass% Mo Carburized Isothermal heat treatment

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The growth of acicular ferrite in Fe-Mn Annika Borgenstam

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  1. The growth of acicular ferrite in Fe-Mn Annika Borgenstam

  2. Fe - 0.92, 1.81, 3.67, 5.54, 7.60 mass% Ni Fe – 0.99, 1.98, 3.92, 5.66 mass% Cr Fe – 0.71, 1.69, 2.60, 5.46 mass% Mn Fe - 0.27, 0.51, 1.00, 2.00 mass% V Fe - 0.5, 0.99, 2.01, 3.01 mass% Mo Carburized Isothermal heat treatment Microstructure studied by LOM Measurements of the composition gradients with ASEM Experimental work

  3. Carbon content Distance from surface The gradient technique Distance from surface

  4. Measurement of the carbon gradient with ASEM

  5. Correlation between micro-hardness and carbon content for 2% Mn

  6. 1%Mn 725oC

  7. 6% Mn 350oC

  8. Temperature as function of critical carbon content in Fe-Mn alloys

  9. Growth controlled by: Constant thermodynamic barrier Carbon diffusion Paraequilibrium conditions • One model for lengthening of • Widmanstätten ferrite, upper bainite and lower bainite

  10. Comparison of experimental data with WBs 0.71% 1.69% 2.60%

  11. Critical temperature for Fe-Mn alloys with 0.1 mass% C

  12. Critical temperature as function of Mn content for Fe-Mn alloys with 0.1 mass% C

  13. Critical temperature as function of Mn content for 0.1 mass% C compared with WBs calculation

  14. Critical temperature as function of Mn content for Fe-Mn alloys with 0.2 mass% C

  15. Critical temperature as function of Mn content for 0.2 and 0.6 mass% C compared with WBs calculation

  16. The themodynamic barrier

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