The steel of Japanese sword is refined from a special sponge steel(tamahagane) by a sequence of forge-folding processes. Compared toordinary carbon steel, the steel of Japanese sword usually does not havea uniform distribution of carbon content. The carbon content of Japanesesword varies both locally and globally (Fig.1). Therefore, it is necessaryto find a method for local measurement of carbon content in Japanesesword for quantitative evaluation of its microstructure.
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