Definition: Prehardening is a process used in casting and forging processes to improve the strength, hardness, and ductility of cast or forged metal. It involves adding a high temperature (around 400-500°C) at the beginning of the casting or forging process to enhance the strength and toughness of the material. This step is often performed after the initial cooling of the metal, which helps in achieving a higher melting point and reducing the risk of cracking during the casting or forging process.
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