A video showing a 1095 knife blade cooling from above critical temperature. As the metal cools the crystalline structure changes. When the crystalline structure changes heat is released causing the metal to get hot again. This is called recalescence.
The opposite reaction, decalescence, occurs as you heat metal. The red hot metal will turn black as the crystalline changes forms. When you see these shadows you know the metal has reached critical temperature.
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29 сен 2024