Microstructural Observation on Materials of the Japanese Sword under Fold-Forging Process

Go Takami; Takuya Ohba; Shigekazu Morito; Ananda Kumar Das

doi:10.4028/www.scientific.net/MSF.654-656.134

Paper Titles

650°C Long-Term Structure Stability Study on 18Cr-9Ni-3CuNbN Heat-Resistant Steel
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In Situ TEM and APT Analysis on the Dislocations Associated with Solute Carbons in Strain-Aged Low Carbon Pipeline Steels
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In Situ Observation of Microstructure Evolution in Low Carbon Bainite Steels Isothermally Held Below A₁ Temperature
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Isothermal Martensitic Transformation in a Sensitized SUS304 Stainless Steel under Magnetic Field
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Microstructural Observation on Materials of the Japanese Sword under Fold-Forging Process
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Evidence of Lath Martensite in High-C Japanese Sword Produced from Tamahagane Steel by Tatara Process
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Colored Metallography Study of Bainite Steel Used for High Speed Railway Crossing
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Relationship between Particle Size and Martensitic Transformation in an Fe-30at%Ni Alloy
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Spheroidization Behavior of Cementite in a High Carbon Steel
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Microstructural Observation on Materials of the Japanese Sword under Fold-Forging Process

Abstract:

The Japanese sword is produced from a special kind of steel called tamahagane, using a forge-fold operation repeated several times. The purpose of this study is to clarify the development of microstructures with successive forge-fold operations using tamahagane. Specimens under several stages of sword making have been investigated with optical microscopy, scanning electron microscopy and electron probe micro analysis methods. Microstructures have been found to be a combination of ferrite and pearlite with a lot of nonmetallic inclusions. The ferrite bands become finer and among other inclusions Fe2SiO4 takes a spherical shape with increasing recurrence of forge-fold operations.