martensite

Definition

The superhero form of steel that appears when iron and carbon are heated then rapidly cooled, creating a hard, strong crystalline structure. Named after German metallurgist Adolf Martens, this phase transformation is what gives hardened steel its edge—literally. It's basically what happens when metal gets a shock treatment and comes out tougher for it.

Example Usage

The blacksmith quenched the blade rapidly to form martensite, giving the sword its legendary hardness.

Source: Metallurgical terminology

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