Hardening
Metallurgy (Heat Treatment): This involves heating steel or aluminum to specific temperatures, followed by rapid cooling (quenching) in oil, water, or gas to increase strength.
Tempering: Often, hardened metal is too brittle, requiring a second, lower-temperature heating process (tempering) to improve toughness.
Case Hardening: A technique that hardens only the surface of a metal component, such as gears or shafts, leaving a tougher core.
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