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Burning Blade
Dec 05, 2016

"Hardening [2]" the last fire forging sequence. Knife by using clay, powdered charcoal and whetstone powder out of burning Blade (やきばつち,

Yakibatsuchi), forming the body with burning blade mound. Blade with soil is thin, picks and thick with the Earth. Basically, the burning blade edge of the distribution can be represented by the finished product shows some clue. Burning blade soil composition and the different schools have different modulation methods. Good body will be put to the fire of 750 c-760. Knife judge according to the experience by the color of the flame temperature, if temperatures exceed 800 degrees or more, it could affect the strength of the sword. After a specific time, Cutler will put the knife into water cooling, the other a hardening process. This step knife becomes harder and sharper, heat expands leading blade bending arc, knife surface to generate a very strong "Maddens Crystal" or "hemp fields in bulk" (Martensite). What Maddens Crystal (the hemp fields in bulk), in short, that is, high-temperature crystal structure as a result of chilling, carbon atoms are locked in the grain and produce "metastable" (Metastable) State, so there is a great deal of internal tension between crystals, resulting in "hard" effect. After this step in the blade with the face boundary produces granular pattern like a sand sprinkled, Japanese known as boiling (に え, Nie). Overall, these little white spots form of white fog lines, known as the Xiong (におい, Nioi) is appreciating Japan knife an important basis for quality.

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