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Carbide precipitation during stage I tempering of Fe-Ni-C martensites

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Abstract

Microstructural changes which accompany the first stage of tempering have been studied by transmission electron microscopy (TEM) and electrical resistometry in two Fe-Ni-C alloys that form platelike martensite. The ε-carbide transition phase in these alloys adopts a platelike shape with a habit plane near {012=α. Electron diffraction data indicate that the carbide may be partially ordered, resulting in orthorhombic symmetry, and therefore, this phase is designated as ε′- carbide. The carbide particles contain a fine internal substructure which appears to represent an internal accommodation deformation (faulting) on the carbide basal plane. Detailed analysis of the kinematics of carbide precipitation suggests that the observed habit plane and accommodation deformation permit an invariant-plane strain transformation which minimizes elastic strain energy. The apparent selection of only a limited number of possible orientation variants is explained in terms of the symmetry of the parent martensitic phase, which is known to undergo spinodal decomposition prior to the nucleation of the transition carbide. The martensitic substructure is not found to exert any significant influence on this overall precipitation behavior.

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formerly with the Massachusetts Institute of Technology

formerly with the Massachusetts Institute of Technology

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Taylor, K.A., Olson, G.B., Cohen, M. et al. Carbide precipitation during stage I tempering of Fe-Ni-C martensites. Metall Trans A 20, 2749–2765 (1989). https://doi.org/10.1007/BF02670168

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  • DOI: https://doi.org/10.1007/BF02670168

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