ᐇ㦂ሗ࿌᭩ᵝᘧ䠄୍⯡฼⏝ㄢ㢟䞉ᡂᯝබ㛤฼⏝䠅㻌䠄 䈜ᮏሗ࿌᭩䛿ⱥㄒ䛷グ㏙䛧䛶䛟䛰䛥䛔䚹䛯䛰䛧䚸⏘ᴗ฼⏝ㄢ㢟䛸䛧䛶᥇ᢥ䛥䜜䛶䛔䜛᪉䛿᪥ᮏㄒ䛷グ㏙䛧䛶䛔䛯䛰䛔䛶䜒⤖ᵓ䛷䛩䚹 䠅㻌Experiental R eport Report㻌MLFmExperimental

承認日Dateof Approval
2016.6.8
ᥦฟ᪥Dateof Report㻌

承認者Approver Takenao Shinohara

2016.05.10
提出日Date of Report 2016.6.7

ㄢ㢟␒ྕ㻌 Project No.㻌⿦⨨㈐௵⪅ Name of responsible person㻌

2015A0151

Takenao Shinoharaᐇ㦂ㄢ㢟ྡ㻌 Title of experiment㻌
Nondestructive study of traditional Japanese forged iron
artifacts using pulsed neutron imaging for evaluating
crystallographic texture and microstructure and investigating
their manufacturing techniquesᐇ㦂㈐௵⪅ྡ㻌 Name of principal investigator㻌⿦⨨ྡ Name of Instrument/䠄BL No.䠅㻌
BL22
ᐇ᪋᪥ Date of Experiment㻌
11/06/2015䡚11/12/2015㻌

Manako Tanakaᡤᒓ㻌 Affiliation㻌
Tokyo University of the Arts㻌
ヨᩱ䚸ᐇ㦂᪉ἲ䚸฼⏝䛾⤖ᯝᚓ䜙䜜䛯୺䛺䝕䞊䝍䚸⪃ᐹ䚸⤖ㄽ➼䜢䚸グ㏙䛧䛶ୗ䛥䛔䚹䠄㐺ᐅ䚸ᅗ⾲ῧ௜䛾䛣䛸䠅㻌
Please report your samples, experimental method and results, discussion and conclusions. Please add figures andtables for better explanation.
㻝㻚㻌 ヨᩱ Name of sample(s) and chemical formula, or compositions including physical form.㻌
(1) Japanese matchlock gun, Fe, solid(2) Fragments of Japanese matchlock gun, Fe, solid(3) Fragments of Japanese matchlock gun, Fe, solid(4) Fragments of Japanese sword manufactured by the Mino school, Fe, solid(5) Fragments of Japanese sword manufactured by the Mino school, Fe, solid(6) Fragments of Japanese sword manufactured by the Mino school, Fe, solid(7) Fragments of Japanese sword, Fe, solid(8) Reproduction sample of Japanese sword, Fe, solid(9) Reproduction sample of Japanese sword, Fe, solid㻌㻌㻞㻚㻌 ᐇ㦂᪉ἲཬ䜃⤖ᯝ㻌 䠄ᐇ㦂䛜䛖䜎䛟䛔䛛䛺䛛䛳䛯ሙྜ䚸䛭䛾⌮⏤䜢グ㏙䛧䛶䛟䛰䛥䛔䚹䠅㻌
Experimental method and results. If you failed to conduct experiment as planned, please describe reasons.㻌 㻌䛆Experimental method䛇The experiment was carried out by the pulsed neutron imaging using the TOF method (Fig.1) and alsoby neutron CT at J-PARC/MLF BL22. A 2D-PSD, nGEM (the spatial resolution: 800μm, detection area:10cm×10 cm), was used to get the spatial dependent TOF data and CCD camera was used for CT.
䛆Results䛇
Although there was a trouble at J-PARC
and a postponement of the experiment,
the experiment itself was conducted asplanned. First, we analyzed Fragmentsof Japanese swords manufactured byFig.1.㻌 Experimental layout of the pulsed neutron1㻞㻚㻌 ᐇ㦂᪉ἲཬ䜃⤖ᯝ䠄䛴䛵䛝䠅㻌 Experimental method and results (continued)
the Mino school, reproduction sample of Japanese sword by the pulsed neutron imaging. One of theaim of the experiment was to compare the results by nondestructive methods using pulsed neutron withthe results by destructive methods and to accumulate the fundamental data of crystallographic
information for the systematic measurement of Japanese iron artifacts in the future. The microstructureof the fragments of Japanese sword manufactured by the Mino school were already observed by optical
microscope. Those swords show distinctive features of microstructure as shown in Fig.2. Now we arejust in the middle of analyzing the data obtained from pulsed neutron TOF methods and checking how
detailed information on microstructure such as and strain, and carbon content can be got by Bragg
edge analysis.
Secondly, we analyzed fragments of Japanese swords manufactured by the Mino school, reproduction
sample of Japanese sword, and the whole area of Japanese matchlock gun, and so on by using
neutron CT. Our results so far have proved the efficacy of the pulsed neutron imaging methods, but wethought that to carry out the neutron CT experiment is also very useful to grasp the inner structure andmetallurgical characteristics three-dimensionally. Fig.3 and Fig.4 show obtained neutron CT image ofJapanese swords manufactured by the Mino school and Japanese matchlock gun. By comparing theneutron CT images and the microscopic images, it became clear that by using neutron CT, we canidentify the differences of the carbon content (α-Fe and perlite) and the area and the depth of thequenching (martensite) of Japanese swords, and the conjugation method of Japanese matchlock gun
due to the light and shade nondestructively. On the other hand, because of the spatial resolution,differences of the carbon content in a very small area (Fig.2 (b)) could not be identified this time. In thefuture, we would like to experiment again using higher resolution neutron CT.
(a)

(b)

difference of thecarbon content

Fig,2 Optical microscope of the fragments of Japanese sword
manufactured by the Mino school.

(a)

(b)

Fig.3 Neutron CT of the fragments of Japanese sword

Fig.3 Neutron CT of Japanese matchlock gun

manufactured by the Mino school (the same samples as Fig.2).
2