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Morphology of cementite decomposition in an fe-cr-c alloy

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Abstract

Dissolution of spheroidal cementite in austenite at 910 °C has been studied by means of scanning and transmission electron microscopy. Three different morphologies of transformation have been observed. Most of the particles undergo a more or less homogeneous shrinkage. However, some of the particles transform to austenite by a Widmanstätten type of reaction, whereby austenitic plates form inside the cementite. It is also observed that some of the cementite transforms to M7C3 carbide and austenite by a eutectoid reaction. The results can be understood by considering the phase diagram and assuming that local equilibrium prevails at the phase interface during the reaction.

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Authors and Affiliations

  1. Division of Physical Metallurgy, Royal Institute of Technology, S-10044, Stockholm, Sweden

    ZI-Kui Liu (Graduate Student) & John ågren (Professor)

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  1. ZI-Kui Liu
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  2. John ågren
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Liu, ZK., ågren, J. Morphology of cementite decomposition in an fe-cr-c alloy. Metall Trans A 22, 1753–1759 (1991). https://doi.org/10.1007/BF02646499

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