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The tempering of iron- carbon martensite; dilatometric and calorimetric analysis

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Abstract

The aging behavior of iron-carbon martensite (1.13 wt Pct C) between -190 °C and 450 °C was investigated by quantitative analysis of the corresponding changes in volume and enthalpy. A method to determine activation energies of the occurring solid-state transformations by performing non-isothermal measurements of some physical property of the specimen has been described. Martensitic specimens were prepared by carburizing pure iron and quenching in brine and liquid nitrogen. The dilatometric and calorimetric experiments were supplemented with microhardness measurements. At least five different stages of structural change can be distinguished, which are quantitatively analyzed in terms of their effects on volume and enthalpy: (i) transformation of retained austenite into martensite (between −180 and −100 °C); (ii) redistribution of carbon atoms (below 100 °C); (iii) precipitation of transition carbide (between 80 and 200 °C); (iv) decomposition of retained austenite (between 240 and 320 °C); and (v) conversion of transition carbide into cementite (between 260 and 350 °C).

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Authors and Affiliations

  1. Laboratory of Metallurgy, Delft University of Technology, Rotter-damseweg 137, 2628, AL Delft, The Netherlands

    Liu Cheng, C. M. Brakman, B. M. Korevaar & E. J. Mittemeijer

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  1. Liu Cheng
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  2. C. M. Brakman
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  3. B. M. Korevaar
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  4. E. J. Mittemeijer
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Cheng, L., Brakman, C.M., Korevaar, B.M. et al. The tempering of iron- carbon martensite; dilatometric and calorimetric analysis. Metall Trans A 19, 2415–2426 (1988). https://doi.org/10.1007/BF02645469

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  • DOI: https://doi.org/10.1007/BF02645469

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