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Martensite

Type of steel crystalline structure / From Wikipedia, the free encyclopedia

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Martensite is a very hard form of steel crystalline structure. It is named after German metallurgist Adolf Martens. By analogy the term can also refer to any crystal structure that is formed by diffusionless transformation.[1]

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Martensite in AISI 4140 steel
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0.35% carbon steel, water-quenched from 870 °C