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Magnetic imaging study of a grain-oriented electric steel using polarized pulsed neutrons

廣井 孝介; 篠原 武尚; 林田 洋寿*; Parker, J. D.*; 及川 健一; Su, Y.; 甲斐 哲也; 鬼柳 善明*

no journal, , 

Grain-oriented (GO) electric steels are widely used in electromagnetic devices and are key materials that determine their performance. Since the magnetic properties of a GO steel are closely related to its magnetic domain structure, observation of the domain is important for understanding and improving its magnetic properties. In this presentation, we introduce our magnetic imaging method using polarized pulsed neutrons and show some results observing an internal magnetic domain structure of a GO steel sheet.

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Engineering materials studies using pulsed neutron diffraction at J-PARC

Harjo, S.; 川崎 卓郎; 相澤 一也; Gong, W.*

no journal, , 

Current status of The Engineering Materials Diffractometer TAKUMI in J-PARC and two research-examples will be introduced. First example is martensite phase stress and the strengthening mechanism in TRIP. The stress evolution in the constituent phases including martensite were directly measured. The stress contribution from martensite to the strength increased with increasing applied true strain, where that from bainitic ferrite was almost unchanged and that from austenite decreased, demonstrating directly that the deformation induced martensitic transformation contribute to the increase in strength. Second example is work hardening, dislocation structure and load partitioning in a lath martensite steel containing 0.22 mass% carbon. Redistributions of the stress and dislocation densities/arrangements occurred in two lath packets: soft packet, where the dislocation glides are favorable, and hard packet, where they are unfavorable.

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Microstructural characterization of a Japanese sword using neutron diffraction

Harjo, S.; 川崎 卓郎; 篠原 武尚; Grazzi, F.*

no journal, , 

Japanese swords are paid great admiration in the world as the honour of classical technology and of the beautiful art. A mapping measurement using pulsed neutron diffraction (ND) with time-of-flight (TOF) method is suitable for the non-destructive microstructural studies in Japanese swords because of the high penetration ability of neutron and the simultaneous measurement of multiple Bragg peaks. The microstructural observation in a Japanese sword made in Keicho era (1596-1615) was performed by an ND mapping using TAKUMI, a TOF neutron diffractometer for engineering materials studies at J-PARC. The distributions of phase, lattice constant, residual strain, phase fraction, dislocation density and crystallite size were evaluated from the ND patterns. The details will be reported.

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