A metastable iron phase supersaturated in carbon that is the product of a diffusionless transformation from austenite.

Martensite is a microconstituent or structure in quenched steel characterized by an acicular or needle-lie pattern on the surface of polish. It has the maximum hardness of any of the structures resulting from the decomposition products of austenite.

See also: Ausforming, Austenite, Martempering.

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Subjects: Materials