たたら製鉄と鍛錬による小刀の製作

概要

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Iron sand mined from Mukaihama beach in the city of Akita was applied to make "Tamahagane" based on combined use of the "Tatara-buki" and "Oroshigane" process. The Tamahagane was applied to make a small knife based on hot forging process. Initially, the iron sand was washed in water and dressed magnetically to rise iron content of the sand. After that, the iron sand was smelted by means of the "Tatara-buki" process to produce Tamahagane with lower phosphorous and sulfur contents. The Tamahagane was obtained in a 10.4% yield which was lower than that of 26% in usual process. The reason was considered to be due to high concentration of SiO_2 in the dressed iron sand. The Tamahagane showed a mixed structure of ferrite and pearlite. Finally, the Tamahagane was forged at about 1100K to make a small knife which was about 3mm in thickness and 80mm in length. It was available to use as a fruit knife, though the microstructure was macroscopically non uniform.
秋田大学の論文