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Study of the Eutectoid Transformation in Nodular Cast Irons in Relation to Solidification Microsegregation

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Abstract

Eutectoid transformation in cast irons may proceed in the stable or the metastable systems giving ferrite and graphite for the former and pearlite for the latter. The present work demonstrates that composition profiles across ferrite/pearlite boundaries are smooth and similar to those issued from the solidification step. No trace of long-range diffusion of substitutional solutes due to austenite decomposition could be observed. In turn, this ascertains that both stable and metastable transformations proceed with the product matrix—either ferrite or pearlite—inheriting the parent austenite content in substitutional solutes. This result sustains a physical model for eutectoid transformation based on the so-called local para-equilibrium which is commonly used for describing solid-state transformation in steels.

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Author information

Authors and Affiliations

  1. CIRIMAT, Université de Toulouse, Toulouse, France

    Alexandre Freulon, Jacques Bourdie & Jacques Lacaze

  2. GET, UMR 5563 CNRS, Université de Toulouse, Toulouse, France

    Philippe de Parseval

  3. Centre de Microcaractérisation Raimond Castaing, Université de Toulouse, Toulouse, France

    Philippe de Parseval & Claudie Josse

  4. Saint-Gobain Pont-à-Mousson, Pont-à-Mousson, France

    Jacques Bourdie

Authors
  1. Alexandre Freulon
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  2. Philippe de Parseval
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  3. Claudie Josse
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  4. Jacques Bourdie
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  5. Jacques Lacaze
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Corresponding author

Correspondence to Jacques Lacaze.

Additional information

Manuscript submitted March 10, 2016.

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Appendix

Appendix

The thermodynamic evaluation of the Fe-Sb phase diagram by Benyan Pei et al.[18] has been introduced in the available SSOL databank that was last updated in 1998. The only change made to this latter bank is the improvement of the Fe-C-Si system performed by Miettinen[19] to the earlier assessment by Lacaze and Sundman.[20] Owing to the very limited amount of antimony relevant for cast irons production (0.1 mass pct at most), it could be considered that appropriate calculations for Fe-C-Si-Sb alloys could be performed without further modifications. Figures A1 and A2 compare isopleth Fe-C sections of, respectively, the stable and metastable systems at 2.0 mass pct Si and 0 and 1 mass pct Sb. According to these figures, 1 mass pct antimony shifts slightly both the stable and metastable eutectoid ranges to higher temperature. The T α and T p reference temperatures used in the main text are shown in Figures A1 and A2, respectively.

Fig. A1
figure 13

Isopleth Fe-C section of the stable Fe-C-Si-Sb phase diagram at 2.0 mass pct Si and 0 and 1 mass pct Sb in the temperature range of the eutectoid transformation. The T α reference temperature for the alloy at 1 mass pct Sb is indicated with an arrow

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Fig. A2
figure 14

Isopleth Fe-C section of the metastable Fe-C-Si-Sb phase diagram at 2.0 mass pct Si and 0 and 1 mass pct Sb in the temperature range of the eutectoid transformation. The T p reference temperature is assumed to be on the extrapolation of the γ/α equilibrium line as indicated with an arrow for the alloy at 1 mass pct Sb

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Freulon, A., de Parseval, P., Josse, C. et al. Study of the Eutectoid Transformation in Nodular Cast Irons in Relation to Solidification Microsegregation. Metall Mater Trans A 47, 5362–5371 (2016). https://doi.org/10.1007/s11661-016-3692-3

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