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Your search keyword '"Muroga, Takeo"' showing total 118 results
Start Over Author "Muroga, Takeo" Journal fusion engineering and design
118 results on '"Muroga, Takeo"'

26. Deformation and fracture behaviour, and thermal stability of ODS-Cu/ODS-Cu and SUS/ODS-Cu joints fabricated by advanced brazing technique

Author

TOKITANI, Masayuki, HAMAJI, Yukinori, HIRAOKA, Yutaka, MASUZAKI, Suguru, TAMURA, Hitoshi, NOTO, Hiroyuki, TANAKA, Teruya, MUROGA, Takeo, SAGARA, Akio, and the FFHR Design Group

Subjects
ODS-Cu, Divertor, Nuclear Energy and Engineering, Brazing, Mechanical Engineering, Deformation behavior, General Materials Science, Thermal stability, Fracture behavior, Civil and Structural Engineering
Abstract

A joint of oxide dispersion strengthened copper alloy (ODS-Cu; GlidCop®), i.e., GlidCop®/GlidCop® joint and a joint of stainless steel (SUS) and GlidCop®, i.e., SUS/GlidCop® joint were prepared by using the advanced brazing technique (ABT). Deformation and fracture behavior, and thermal stability of these joints were investigated by means of three-point bending test, scanning electron microscope (SEM) and energy dispersive X-ray spectroscopy (EDS). Firstly, in the case of the GlidCop®/GlidCop® joint, plastic deformation occurred predominantly in the diffusion layer with lower hardness. The fracture proceeded approximately at the center of the diffusion layer. In the case of the SUS/GlidCop® joint, on the other hand, plastic deformation occurred widely in the bulks, GlidCop® and SUS near the interfaces between the bulk and the bonding layer. The fracture proceeded mainly along the interface between the bonding layer and the bulk GlidCop®, and substantially along the interface between the bonding layer and the bulk SUS. Secondly, influences of 2nd-step heat on the GlidCop®/GlidCop® and SUS/GlidCop® joints were examined from viewpoints of microstructure and mechanical strength. Almost no obvious changes in the width of the diffusion layer (GlidCop®/GlidCop® joint) or the bonding layer (SUS/GlidCop® joint), and in the element distribution in these layers after the 2nd-step heat were recognized. In addition, any obvious changes in the shape of stress-strain curve and yield strength were not recognized for both joints.

Published
2022

44. Tensile properties of F82H steel after aging at 400-650 degrees C for 1000-30,000 h

Author

Nagasaka, Takuya, Tanaka, Takuya, Muroga, Takeo, and Sagara, Akio

Abstract

The present study conducted tensile tests on F82H steel after aging at 400–650 °C for 1000–30,000 h, and discusses the process for change in tensile properties during the long-term aging, combined with previous study for 100,000 h aging. The limit for aging time to keep tensile strength is more than 100,000 h for 400 and 500 °C aging, 10,000 h for 550 °C, 3000 h for 600 °C, and less than 1000 h for 650 °C. While, no degradation of ductility was detected after all the aging examined. Regression analyses were performed with Hollomon-Jaffe parameter and Lambda parameter on the degradation of tensile strength during aging, and prior tempering in the heat treatment before the aging. Lambda parameter analysis successfully derived a master curve to describe the tensile strength after the long-term aging.

Published
2018

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