Watch a Katana Bend When It Hits Liquid

Watch a Katana Bend When It Hits Liquid

In order to harden the edge of steel, swords are often heated until they’re impossibly hot and then quenched in liquid to rapidly cool down. This creates a much stronger grain structure in the steel which obviously leads to a much stronger sword. An interesting thing that happens during this quenching process is how the sword dramatically bends before it snaps back into shape (with a slight upward tilt).

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