※ 半角英数字
 年 ~ 
検索結果: 9 件中 1件目~9件目を表示
  • 1


Initialising ...



Initialising ...


Initialising ...


Initialising ...


Initialising ...


Initialising ...


Initialising ...


Initialising ...



Neutron Bragg-edge transmission imaging for microstructure and residual strain in induction hardened gears

Su, Y. H.; 及川 健一; 篠原 武尚; 甲斐 哲也; 堀野 孝*; 井戸原 修*; 三阪 佳孝*; 友田 陽*

Scientific Reports (Internet), 11, p.4155_1 - 4155_14, 2021/02

 被引用回数:11 パーセンタイル:73.3(Multidisciplinary Sciences)

A time-of-flight Bragg-edge neutron transmission imaging was used to investigate the microstructure and strain distributions in a gear hardened by a newly developed two-step induction-heating method: precursor (Sample 1) and final product (Sample 2). The edge- position and edge-broadening were determined and mapped with high spatial resolution, which enabled us to confirm the two-dimensional distributions of the microstructure and residual strain. A deep hardened layer was made for Sample 1 in which martensite was formed on the entire teeth and the outer peripheral portion of the gear body. Sample 2 was subjected to double induction-hardening, where a tempered martensite was formed as the thermal refined microstructure between a fine-grained martensite at the tooth surface and a ferrite-pearlite microstructure at the core. The relationship between edge-broadening and the Vickers hardness described by a linear equation was employed to derive the elastic residual strain. The residual strain map for Sample 2 revealed that a steep compressive strain was introduced into the fine-grained martensite at the tooth surface by the super rapid induction- heating and quenching process. The reversal of tension was speculated to occur below 2 mm from the tooth tip, and the strain was almost zero in the core region.


Intergranular strains of plastically deformed austenitic stainless steel

鈴木 賢治*; 菖蒲 敬久

E-Journal of Advanced Maintenance (Internet), 10(4), p.9 - 17, 2019/02



Development of inservice inspection method for graphite components by micro-indentation technique in the HTTR

石原 正博; 相原 純; 奥 達雄*

Proc. of 14th Int. Conf. on Structural Mechanics in Reactor Technology, 2, p.455 - 462, 1997/00




石原 正博; 奥 達雄*

日本機械学会論文集,A, 62(602), p.2305 - 2309, 1996/00




國富 一彦; 菱田 誠; 田中 利幸

日本原子力学会誌, 26(1), p.44 - 46, 1984/00

 被引用回数:0 パーセンタイル:0.3(Nuclear Science & Technology)



Experimental studies of 4-inch pipe whip test under BWR LOCA conditions

栗原 良一; 植田 脩三; 磯崎 敏邦; 宮崎 則幸; 矢野 歳和; 加藤 六郎; 宮園 昭八郎

Nucl.Eng.Des., 76(1), p.23 - 33, 1983/00

 被引用回数:8 パーセンタイル:68.42(Nuclear Science & Technology)



The Redidual strain of polycrystalline graphite, 2; Relationship between the strain and the energy dissipated during compression tests

衛藤 基邦

Journal of Nuclear Materials, 57(2), p.205 - 211, 1975/02




The Residual strain of polycrystalline graphite, 1; Its stress dependence and the irradiation effect

衛藤 基邦; 奥 達雄

Journal of Nuclear Materials, 57(2), p.198 - 204, 1975/02



Strain and microstructure distributions around a fatigue crack tip by neutron Bragg-edge imaging and diffraction

Su, Y. H.; Parker, J. D.*; 篠原 武尚; 及川 健一; 甲斐 哲也; Gong, W.; Harjo, S.; 川崎 卓郎; 相澤 一也; 鬼柳 善明*

no journal, , 

Fatigue damage is known as one of the major concerns in maintaining the integrity of large-scale engineering components. The nonlinear strain/stress distribution around a fatigue crack tip has a great impact to understand the fatigue and crack growth behavior of engineering component. We consider that it is possible to reveal local variations in strain and microstructure around a fatigue crack tip throughout the thickness of the material by using the non-destructive Bragg-edge imaging and diffraction probes. To investigate the influence of austenitic and ferritic phases on the changes in the strain and microstructure of steels during cyclic fatigue, we selected a typical single austenite stainless steel SUS304 and a duplex stainless steel SUS329J4L. The fatigue tests on the compact-tension samples were conducted with a servo-hydraulic fatigue testing machine. The pulsed Bragg-edge imaging experiment on the fatigued samples was performed at BL22 RADEN in MLF/J-PARC. The time-of-flight neutron diffraction strain mapping was performed at BL19 TAKUMI in MLF/J- PARC. Two-dimensional maps of inhomogeneous residual strain and microstructure for the samples, which had been under different fatigue loading conditions, were determined by Bragg-edge spectral analysis. The obtained Bragg-edge imaging results were quantitatively compared with those determined by diffraction. Surface strains measured by digital image correlation during the fatigue tests will also be presented.

9 件中 1件目~9件目を表示
  • 1