Abstract
In the course of tempering ferritic and martensitic structures obtained after quenching with water, an isomorphous, ordered, metastable and transient phase of Fe3Si was observed in the form of spherical particles coherent with the matrix. Coarsening of the precipitate is controlled by bulk diffusion as in the model of Lifshitz and Wagner. If the temper is prolonged, the transient phase is reduced, to the benefit of an isomorphous phase in equilibrium with Laves’ Fe2Ti phase. A study was carried out on this precipitation in an iron-chromium ferritic matrix, an iron-manganese martensitic matrix and a two phased ferrite-martensite matrix of iron-chromium-manganese. The different cases were considered and the mechanical properties of the hardened alloys were examined. Observation by transmission electron microscopy showed that the variations can be explained by an interaction mechanism between the precipitate and the dislocations. It has been seen that at diameters less than a critical value, a shear mechanism exists in the ordered precipitate, followed, when the average diameter is greater, by an Orowan bypass mechanism. The type of fracture observed by scanning electron microscopy has been interpreted in terms of the mechanism.
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