Study of strength and toughness in Japanese sword produced from Tamahagane steel by Tatara process

Yaso, Muneo; Takaiwa, T.; Minagi, Y.; Kanaizumi, Tsuyoshi; Kubota, K.; Noda, Yasutoshi; Das, Abhimanyu; Morito, Shigekazu; Ohba, Takayoshi

doi:10.1504/ijmpt.2011.044913

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2013

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“…Japanese sword is a treasure of Japan and has long history since 6th century [1,2]. It has been well known in the world that Japanese sword has good cutting property, hardness and toughness and shows beautiful appearance in shape and wavy pattern on the surface.…”

Section: Introductionmentioning

confidence: 99%

Study of Metallurgy and Mechanical Property on Japanese Sword

Yaso¹,

Minagi²,

Takaiwa³

et al. 2013

MSF

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Japanese sword has finer grain size and lath martensite in the microstructure of sharp edge amazingly. Nowadays these structures are considered to be one of the ideal structure at which are greatly aimed to strengthen or improve toughness of steels. Though the carbon content of its sharp edge is 0.70 mass %, there are no lenticular martensite and no micocracking in that area. As a result of bending test by actual sword specimen, one sword was finally bent, the other sword was broken. However it is found the sharp edge in Japanese sword has such a large bending strength 2500, 4600MPa respectively as modern, high performance tool steels and the difference of crack propagation under bending depends on the microstructure distribution and the grain size in cross section of Japanese sword.

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Section: Introductionmentioning

confidence: 99%