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Tempering  

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  • Tempering is a process of heat treating, which is used to increase the toughness of iron-based alloys. Tempering is usually performed after hardening, to reduce some of the excess hardness, and is done by heating the metal to some temperature below the critical point for a certain period of time, then allowing it to cool in still air. (Materials Mechanics Ontology)

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https://purls.helmholtz-metadaten.de/evoks/sdv/tempering

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