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Thread: Japanese swordsmith quenches sword blade - GIF

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    Jon
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    Notice that the thinner edge cooled quicker & drew the curve the reverse of what we expect, then as the heavier back cools it draws the curve back to what we expect.
    Amazing display! Imagine the stresses involved!

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    And thats why they crack so often!

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    PJs
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    Excellent display of differential heat treatment typical to Japanese swordsmith's to achieve a Sori curve seen here. A clay is used to protect and create the beautiful Hamons and holds the temperature of the thicker spine to cool slower. What happens metallurgicaly is kind of magical in just a few seconds as the edge shrinks the grain then relaxes as the spine begins to cool.

    To think this was figured out so long ago with a lot of practice with rudimentary tools and knowledge (but good iron rich sand), a lot of testing and fractures and warps is what makes the people who made/make them so amazing and excellent tools and weapons.
    ‘‘Always do right. This will gratify some people and astonish the rest.’’
    Mark Twain

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    Carpenter & blacksmith Philip Davies's Avatar
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    Notice the even colour throughout! I wonder whether that water is brine and whether it is at room temperature?


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