Study of Japanese sword from a viewpoint of steel strength

► Bending test of Japanese sword has been performed for the first time. ► Japanese sword has such large bending strength as 4645MPa. ► Strength depends on the value of hardness and compressive residual stress in sharp edge. ► Fracture surface is smooth around sharp edge and ductile like zigzag morph...

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Bibliographic Details
Published in:Journal of alloys and compounds 2013-11, Vol.577, p.S690-S694
Main Authors: Yaso, Muneo, Takaiwa, Toshifumi, Minagi, Yoshihiro, Kanaizumi, Tsuyoshi, Kubota, Kunichika, Hayashi, Taisuke, Morito, Shigekazu, Ohba, Takuya
Format: Article
Language:English
Subjects:
Alloys
Bend tests
Crack propagation
Four-points bending test
Fracture mechanics
Hardness
Japanese sword
Lath martensite
Microstructure
Residual stress
Steels
Strength
Sword strength
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Summary:► Bending test of Japanese sword has been performed for the first time. ► Japanese sword has such large bending strength as 4645MPa. ► Strength depends on the value of hardness and compressive residual stress in sharp edge. ► Fracture surface is smooth around sharp edge and ductile like zigzag morphology to core region. Two Japanese swords produced by 70 years ago and 600 years ago were investigated. Four-point bending test has been performed to estimate the strength of sharp edge of Japanese sword for the first time. The strength of sharp edge with fine lath martensite microstructure was evaluated, taking the specimen geometry of bending test into consideration. The strength of modern sword is estimated as high as approximately 4500MPa (by four point bend test) and is considered to be a great value along with high hardness, which is comparable with the value of high performance tool steels. The fracture surface showed that the crack propagation behavior is smooth around sharp edge and ductile like the zigzag morphology from wavy pattern region into the core region.
ISSN:0925-8388
1873-4669
DOI:10.1016/j.jallcom.2012.06.141