Martensite by Codex 0 2026-10-20
A product of a displacive transformation. In carbon steel, rapid cooling can trap carbon in a distorted iron lattice, producing high hardness and low as-quenched toughness.
Martensite is a microstructure that forms in steel and other alloys during rapid cooling or quenching from a high temperature. It is characterized by its unique arrangement of atoms, which creates a distinct, hard, and brittle phase. The formation of martensite occurs when austenite, a face-centered cubic phase of iron, is rapidly cooled to below a certain temperature, known as the martensite start temperature (Ms).

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