Crystallographic Structure Study of a Japanese Sword Masamitsu made in the 1969 using Pulsed Neutron Imaging

Crystallographic Structure Study of a Japanese Sword Masamitsu made in the 1969 using Pulsed Neutron Imaging

Kazuma Ohmae, Yoshiaki Kiyanagi, Hirotaka Sato, Kenichi Oikawa, Anh Hoang Pham, Kenichi Watanabe, Yoshihiro Matsumoto, Takenao Shinohara, Tetsuya Kai, Stefanus Harjo, Masato Ohnuma, Shigekazu Morito, Takuya Ohba, Akira Uritani, M. Ito

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Abstract. Energy-resolved neutron transmission imaging technique using an accelerator-driven pulsed neutron source and a time-resolved two-dimensional detector can obtain the Bragg-edge transmission spectrum at each pixel. In this technique, crystallographic information can be visualized over a wide area of a sample. We used this method to investigate the crystallographic information of a modern Japanese sword produced by Masamitsu in 1969. As a result, shifting and broadening of the (110) Bragg-edge was confirmed at the cutting-edge side. It is evidence that the martensite phase exists at the cutting-edge side as a result of the quenching process. By comparing with results of the old Japanese swords, it is found that the martensite region in the modern Japanese sword is wider or deeper than one in the old swords. In addition, we can see strongly preferred orientation of the crystal grains at the boundary between the martensite phase on the cutting-edge side and the ferrite phase on the back-edge side.

Keywords
Japanese Sword, Masamitsu, Martensite, Crystallographic Structure, Pulsed Neutron Imaging, Bragg-Edge Transmission, RITS Code

Published online 1/5/2020, 6 pages
Copyright © 2020 by the author(s)
Published under license by Materials Research Forum LLC., Millersville PA, USA

Citation: Kazuma Ohmae, Yoshiaki Kiyanagi, Hirotaka Sato, Kenichi Oikawa, Anh Hoang Pham, Kenichi Watanabe, Yoshihiro Matsumoto, Takenao Shinohara, Tetsuya Kai, Stefanus Harjo, Masato Ohnuma, Shigekazu Morito, Takuya Ohba, Akira Uritani, M. Ito, Crystallographic Structure Study of a Japanese Sword Masamitsu made in the 1969 using Pulsed Neutron Imaging, Materials Research Proceedings, Vol. 15, pp 227-232, 2020

DOI: https://doi.org/10.21741/9781644900574-35

The article was published as article 35 of the book Neutron Radiography

Content from this work may be used under the terms of the Creative Commons Attribution 3.0 licence. Any further distribution of this work must maintain attribution to the author(s) and the title of the work, journal citation and DOI.

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