著者
杉岡 奈穂子 北田 正弘 西嶋 雅彦
出版者
公益社団法人 日本金属学会
雑誌
日本金属学会誌 (ISSN:00214876)
巻号頁・発行日
vol.77, no.5, pp.185-191, 2013 (Released:2013-05-01)
参考文献数
15
被引用文献数
2

The metallurgical microstructure and mechanical properties of the spear blade manufactured in the Edo period have been investigated. The purpose of this work is to obtain metallographic data of the spear blade, and to clarify the manufacturing technique of the spear blade. The specimen examined was estimated to have been made from the end of the Muromachi period to the Edo period and has the signature of Shinano-no-Kami Minamoto Takamichi. The spear is 31 cm in length and 10.7 mm in maximum width. The metallurgical microstructure and nonmetallic inclusions of the spear blade are observed using an optical microscope. The carbon concentration is determined by chemical analysis. To evaluate the hardness, micro Vickers hardness (Hmv) is used. The microstructure is observed using an optical microscope and a scanning electron microscope (SEM). The concentration of nonmetallic inclusions is obtained by electron dispersive X-ray analysis (EDS).    A cross-sectional image of the spear after chemical etching shows a metal flow pattern formed by deformation, possibly created by hammering. The striped structure of layers of two types of steel containing different carbon contents stacked on top of each other was observed. The bright areas after etching corresponded to the edges and ridges of the spear, which were cooled rapidly, forming the martensite structure. The other dark areas consist of pearlite and α-Fe (ferrite) grains. Optical micrographs of near-edge areas contain pearlite and martensite grains, and core areas contain pearlite and α-Fe grains. The nonmetallic inclusions in the core steel consist of a few metal oxide particles and a glass matrix. There are Fe-Ti oxide grains in the glass matrix, and an unknown oxide particle adhering on the Fe-Ti oxide grain surface was also observed.

言及状況

外部データベース (DOI)

Twitter (7 users, 10 posts, 9 favorites)

https://t.co/ZNKrbxjZ8z 左の刃長11cmの 室町末ー江戸期の槍だと 丸鍛えと言う事だろうか
https://t.co/8asaFdG7h3 左の室町末ー江戸期の槍だとチタンは入るが 量は書いては無いだろうか
https://t.co/ZNKrbxjZ8z >刃の先端の焼き入れされている箇所のビッカース硬さの値は 600~700 を示し,内部の縞状組織の値は 300~400 であっ た.   日本の槍の刃も700HV等の硬度が有るが 斬撃時柄がしなって 逆側の刃は圧縮されないと言う事なのかだが
https://t.co/ZNKrbx1PUr > ビッカース硬さ(Hmv)は刃先が 600~700,中央部分 (芯部)は 300~400 である.   >著者の測定した鎌倉,室町,江戸期日本刀 の中には折れるのを防ぐために芯に極低炭素鋼を用いている ものもあり,芯のビッカース硬さは 100~160 程度で,
室町時代末期から江戸時代に制作された槍刀身の金属組織pdfもあるのでどうぞ。https://t.co/R02tUUJedb
鎗の金属組成を調べた報告があったのでメモ。 https://t.co/RCPfcJRhiu
槍(の刀身)は突くだけなので刀ほど折れにくさは要らない、と製法解析した話。 #今日の論文 『室町時代末期から江戸時代に製作された槍刀身の金属組織』 日本金属学会誌 Vol. 77 (2013) No. 5 p. 185-191 https://t.co/WkPNZCxbbu

収集済み URL リスト