The heating of iron (or another iron-based metal such as steel) to a temperature at which it changes crystal structure from ferrite to austenite.

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  • martemper — verb To subject (steel) to a heat treatment involving austenitization followed by step quenching (at a rate fast enough to avoid the formation of ferrite, pearlite or bainite), used to produce martensite under relatively low stress …   Wiktionary

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