論文

公開件数: 19 件
No. 掲載種別 単著・共著区分 タイトル 著者 誌名 出版者 巻号頁 出版日 ISSN DOI URL 概要
1 研究論文(学術雑誌)
共著
Quantitative phase fraction analysis of steel combined with texture analysis using time-of-flight neutron diffraction
Yusuke Onuki, Akinori Hoshikawa, Shigeo Sato, Toru Ishigaki & Toshiro Tomida
Journal of Materials Science

52/ 19, 11643-11658
2017/06/27
0022-2461
DOI 10.1007/s10853-017-1309-x

The accuracy of the phase fraction determined by time-of-flight neutron
diffraction measurement at iMATERIA was verified by preparing model samples
consisting of laminations of ferritic and austenitic stainless-steel sheets.
Rietveld texture analysis, based on 132 diffractograms, was employed as the
analysis method. The analyzed volume fractions of austenite agree with the
prepared fractions (0.61–49.3 vol%) with a maximum error of only 5%, relative
to the prepared fractions. This is due to the excellent fitting quality of the multidiffractogram-
based Rietveld refinement with consideration given to the textures
of both the major and minor phases. Although the quality of the texture
analysis for the austenite phase becomes poor, at\5 vol%, the consideration of
the textures improves the accuracy of the phase fraction determination. Also
described is how the textures affect the phase fractions, as determined by the
conventional diffraction method. It is clearly shown that texture cannot be
ignored in phase fraction analysis and, in turn, a reasonable consideration of the
texture realizes precision in the analysis.
2

中性子を利用した結晶方位の先端的評価技術の開発と今後の展望
小貫 祐介
まてりあ
公益社団法人 日本金属学会
55/ 3, 104-107
2016
1340-2625

URL

3 研究論文(国際会議プロシーディングス)
共著
Rapid Measurement of Texture of Metals by Time-of-Flight Neutron Diffraction at iMATERIA and its Applications
Y. ONuki, A. Hoshikawa, S. Sato, T. Ishigaki
Materials Science Forum
Trans Tech Publications
879, 1426-1430
2017
1662-9760
10.4028/www.scientific.net/MSF.879.1426

The authors have developed the texture measurement system at iMATERIA, which is the neutron diffractometers built in Materials and Life Science Experimental Facility (MLF) at J-PARC, Japan. The high flux of the incident beam and Time-Of-Flight method enabled the complete texture measurement within several minutes in case of steels. Since the neutron beam can transmit most of the materials, the measured texture represents the state of whole exposed volume. The multi-histogram analysis also enables to determine phase fractions in a multiphase material as well as the texture of each phase.
4 研究論文(学術雑誌)
共著
Rapid measurement scheme for texture in cubic metallic materials using time-of-flight neutron diffraction at iMATERIA
Yusuke Onuki,* Akinori Hoshikawa, Shigeo Sato, Pingguang Xu,Toru Ishigaki, Yoichi Saito, Hidekazu Todoroki and Makoto Hayashi
Journal of Applied Crystallography

49, 1579-1584
2016/10

10.1107/S160057671601164X
URL
A rapid texture measurement system has been developed on the time-of-flight neutron diffractometer iMATERIA (beamline BL20, MLF/J-PARC, Japan). Quantitative Rietveld texture analysis with a neutron beam exposure of several minutes without sample rotation was investigated using a duplex stainless steel, and the minimum number of diffraction spectra required for the analysis was determined experimentally. The rapid measurement scheme employs 132 spectra, and by this scheme the quantitative determination of volume fractions of texture components in ferrite and austenite cubic phases in a duplex stainless steel can be made in a short time. This quantitative and rapid measurement scheme is based on the salient features of iMATERIA as a powder diffractometer, i.e. a fairly high resolution in d spacing and numerous detectors covering a wide range of scattering angle.
5 研究論文(国際会議プロシーディングス)
共著
Stress and Strain Analysis in an Fe-Ga Alloy Single Crystal
T. Ikeuchi, S. Tsubaki, M. Imafuku, S. Fujieda, Y. Onuki, S. Suzuki
Materials Science Forum
Trans Tech Publications
879, 807-809
2017
1662-9760
10.4028/www.scientific.net/MSF.879.807


6 研究論文(学術雑誌)
共著
Rietveld Texture Analysis for Metals Having Hexagonal Close-Packed Phase by Using Time-of-Flight Neutron Diffraction at iMATERIA
Yusuke Onuki, Akinori Hoshikawa, Soichiro Nishino, Shigeo Sato, Toru Ishigaki
Advanced Engineering Materials
WILEY-VCH Verlag GmbH & Co. KGaA

2017/07/03
1527-2648
10.1002/adem.201700227

Texture is an important property especially for metallic materials having hexagonal close-packed crystal structure. In order to understand the overall property or change in the microstructure of materials, neutron diffraction is a powerful tool of investigation. In this study, we attempt to measure the textures of Ti–6Al–4V (mass%) alloy by using a time-of-flight neutron diffractometer, iMATERIA. The results indicate that the texture measurement for the hexagonal phase is possible with the same method as for cubic metals. The texture of cubic beta phase, whose volume fraction is several percent, can simultaneously be determined together with the hexagonal alpha phase.
7 研究論文(学術雑誌)
共著
Improvement of Magnetostrictive Properties of Fe-15mol%Ga Alloy by Texture Formation during High Temperature Uniaxial Compression Deformation
Y. Onuki, S. Fujieda, S. Suzuki, H. Fukutomi
ISIJ International
日本鉄鋼協会
57/ 4, 755-757
2017/04/01

10.2355/isijinternational.ISIJINT-2016-542
URL
The texture control of Fe–Ga solid solution alloy is examined by high temperature deformation, based on the previously suggested mechanism of high temperature deformation texture formation, “preferential dynamic grain growth (PDGG)”. As the result of uniaxial compression deformation of Fe-15 mol% Ga alloy at 1173 K, sharp alignment of <001> along the compression axis was observed. Microstructural observation by EBSD revealed that the <001> alignment was attributable to the growth of <001> oriented grains. The observed textures and microstructures were similar to those seen in the previous studies of Fe–Si alloys, in which the activation of PDGG was confirmed. Based on these facts, it is concluded that PDGG can be applied as a texture control technique for Fe–Ga alloy. The deformed sample showed larger saturation magnetostriction than the sample without deformation, indicating the effectiveness of the texture control by high temperature deformation.
8 研究論文(学術雑誌)
共著
圧延鋼板に対する中性子回折ラインプロファイル解析における散乱ベクトル方位の影響
塙健太,小貫祐介,轟秀和,齋藤洋一,鈴木茂,佐藤成男
X線分析の進歩
アグネ技術センター
48, 338-345
2017/03/31



We investigated the effect of the relationship between the scattering vector of neutron diffraction and the sample direction processed by cold-rolling on line-profile analysis. It was revealed that dislocation parameters became unstable when using a diffraction profile at the scattering vector parallel to the rolling direction. This is probably due to the inhomogeneous elastic strain caused by the distribution of the Poisson’s effect depending on the crystallographic orientation. On the other hand, the most ideal direction of the scattering vector for the line profile analysis is the normal direction of the rolled sheets. This is because the inhomogeneous elastic
strain and the residual strain was small in this direction. The contribution of austenite and ferrite phases in the duplex stainless steels to the work hardening was also investigated by estimating dislocation density. The dislocation density in the austenite phase was much higher than that in the ferrite phase. Consequently, the austenite phase is mainly responsible for the work hardening with the cold-rolling.
9 研究論文(学術雑誌)
共著
マクロ・ミクロスケール集合組織測定を併用したAZ31マグネシウム合金の室温変形機構の検討
小貫祐介、星川晃範、佐藤成男、石垣徹
軽金属

66/ 11, 628-633
2016/11/30

10.2464/jilm.66.628
URL
The authors measured texture change during uniaxial tensile deformation of extruded bar of AZ31 magnesium alloy by time-of-flight neutron diffraction and EBSD (electron backscatter diffraction). Texture measurement by neutron diffraction revealed the transition of tensile axis distribution in overall gauge volume during the deformation. The concentration of the tensile axis initially observed at 〈213̄0〉. With increasing strain, the dominant peak appeared at 〈9 1 ̄10 0〉 and the initial peak weakened. It was also found that the total density of 〈hki0〉 decreased during the deformation. EBSD showed activations of {101̄1} compression twinning and following double twinning. The twinned region were oriented away from the 〈hki0〉 orientation group. The amount of twinning gradually increased with increasing strain. On the other hand, the deformation of the matrix was achieved by slip deformation, resulting in the formation of the peak at 〈9 1 ̄10 0〉. Based on the above results, it was concluded that the reason for poor ductility of magnesium alloys may not be a lack of 〈c+a〉 slip but twinning and deformation concentration inside of the twins.
10
共著
Local stress development in polycrystalline Fe-17mol%Ga alloy under tensile loading e In situ measurement using synchrotron X-ray micro-beam
Yusuke Onuki , Shun Fujieda , Ryuji Ukai, Shigeo Sato, Masugu Sato, Kentaro Kajiwara, Shigeru Suzuki
Journal of Alloys and Compounds

653, 195-201
2015


URL

11 研究論文(国際会議プロシーディングス)
共著
Textures and Microstructures Formed in WE43 and AZ31 Magnesium Alloys during High
Speed Rolling and Their Formation Mechanisms
Y Onuki, K Hara, H Utsunomiya and J A Szpunar
IOP Conf. Series: Materials Science and Engineering

82
2015


URL

12 研究論文(国際会議プロシーディングス)
共著
Depletion of Manganese in the Surface Layers of Fe-Mn-Si Shape Memory Alloys by Annealing
Yusuke Onuki · Shun Fujieda · Kozo Shinoda · Hiroshi Ohtani · Tadakatsu Maruyama · Shigeru Suzuki
Defect and Diffusion Forum

363, 196-201
2015/05


URL

13

オーステナイト系ステンレス鋼中の加工誘起マルテンサイトの組織形態と磁気特性の相関
三浦 滉大, 小林 悟, 鎌田 康寛, 小貫 祐介, Szpunar Jerzy A.
日本金屬學會誌
The Japan Institute of Metals
78/ 10, 375-380
2014
0021-4876

URL
&nbsp;&nbsp;We have performed high-sensitivity magnetic measurements for tensile-deformed SUS304-type austenitic stainless steel to elucidate a relationship between morphology of martensite particles and structure-sensitive magnetic hysteresis properties. A monotonic increase of the volume fraction of martensite phase up to 14.3% through strain-induced martensitic transformation was observed, while coercivity exhibits a maximum at around 4.3% fraction. Measurements of coercivity varying the magnetic-field direction against tensile direction revealed anisotropy in angular dependence of coercivity that becomes weaker with the progress of plastic deformation. These observations were explained as due to a change of the size and anisotropy in shape of martensite phase with deformation.<br>
14 研究論文(学術雑誌)
共著
High-Speed Rolling of AZ31 Magnesium Alloy Having Different Initial Textures
Yusuke Onuki , Kenichiro Hara, Hiroshi Utsunomiya, Jerzy A. Szpunar
Journal of Materials Engineering and Performance

24/ 2, 972-985
2014/11/22


URL

15 研究論文(学術雑誌)
共著
Texture Development in Fe-3.0mass%Si during High-Temperature Deformation –Texture Control Based on Dynamic Grain Growth Mechanism
Y. Onuki, R. Hongo, K. Okayasu and H. Fukutomi
Acta Materialia

61, 1294-1302
2013


URL

16

Fe-3mass%Si合金の高温単軸圧縮変形中に生じる優先動的結晶粒成長による集合組織形成に及ぼすP添加の影響
小貫 祐介, 森 敬祐, 岡安 和人, 福富 洋志
鉄と鋼
The Iron and Steel Institute of Japan
99/ 3, 228-235
2013
0021-1575

URL

17 研究論文(国際会議プロシーディングス)
共著
Texture Development in Ferritic Steels during High Temperature Uniaxial Compression Deformation
[2] Y. Onuki, K. Okayasu and H. Fukutomi
Material Science. Forum
Trans Tech Publications
702-703, 810-813
2012


URL

18

Fe-3mass%Si合金の高温単軸圧縮変形による集合組織形成に及ぼす変形条件の影響
小貫 祐介, 岡安 和人, 福富 洋志
鉄と鋼
The Iron and Steel Institute of Japan
98/ 5, 177-183
2012
0021-1575

URL

19

Formation of {001} Fiber Texture in Fe-3mass%Si Alloy during Uniaxial Compression Deformation at Elevated Temperatures
ONUKI Yusuke, OKAYASU Kazuto, FUKUTOMI Hiroshi
ISIJ international
The Iron and Steel Institute of Japan
51/ 8, 1564-1565
2011/08/15
09151559

URL