Search

Your search keyword '"Nobuyuki Tanaka"' showing total 34 results
Start Over Author "Nobuyuki Tanaka" Publisher japan society of mechanical engineers
34 results on '"Nobuyuki Tanaka"'

9. Subcritical-crack growth behavior for carbon steel in high-temperature pure water

Author

Takashi Saito, Kunio Hasegawa, Kazumi Suzuki, Masaaki Kikuchi, and Nobuyuki Tanaka

Subjects
Materials science, Carbon steel, Mechanical Engineering, Metallurgy, technology, industry, and agriculture, chemistry.chemical_element, Welding, Paris' law, engineering.material, law.invention, chemistry, Mechanics of Materials, law, engineering, General Materials Science, Growth rate, Stress corrosion cracking, Composite material, Base metal, Carbon, Stress intensity factor
Abstract

Subcritical-crack growth rates for carbon steels in high-temperature pure water are obtained from fatigue and constant load tests. The test specimens, made of STS 42 and 49 carbon steel pipes are CT type and surface-cracked flat plate-type. The experimental environment is saturated pure water at 288°C and 7.8 MPa pressure. The subcritical-crack growth rates are influenced by several factors; the fatigue crack growth rate, da/dN in water is accelerated by low frequency and high stress ratio. The da/dN in water from a trapezoial load wave and for welded metal is less than from a triangular wave and for base metal. In addition, the da/dN in water at 150°C and in a steam environment is lower than in water at 288°C. The growth rate, da/dN, in the thickness and the width directions is almost equivalent to the results of the surface-cracked flat plate specimens. The curve of the crack growth rate, da/dt, is obtained from the constant load test. The threshold value of the stress intensity factor for stress corrosion cracking for STS base and welded metal of carbon steels is relatively large when compared with the sensitized Type 304 stainless steel and other carbon steels.

Published
1990
Full Text
View/download PDF

32. ICONE15-10331 Study on Corrosion Resistance of Glass Lining and Gold Plating in High Temperature Sulfuric Acid for Thermochemical Hydrogen Production IS Process

Author

Hirokazu Suwa, Atsuhiko Terada, and Nobuyuki Tanaka

Subjects
Soda-lime glass, Materials science, Gold plating, Alloy, Metallurgy, Sulfuric acid, engineering.material, Corrosion, chemistry.chemical_compound, chemistry, engineering, Inert gas, Base metal, Hydrogen production
Abstract

In the framework of the HTTR (High Temperature Engineering Test Reactor) project, Japan Atomic Energy Agency has been conducting R and D on thermo-chemical Iodine-Sulfur (IS) process for large scale hydrogen production. Since the IS process constitutes corrosive environments, screening of the materials of construction is very important. Corrosion resistance of lining materials, were examined in 47, 75, 90wt% sulfuric acid for 5 hours at temperatures ranging from 200degC to 400degC under inert gas pressure of 2 MPaG. Gold plating materials showed good corrosion resistance irrespective of the base metal, Alloy B2 and SUS304. Soda glass for glass lining material was corroded in 47wt% sulfuric acid at 200degC. However, it showed good corrosion resistance in 75wt% sulfuric acid at 300degC and in 90wt% sulfuric acid at 400degC. (author)

Published
2007
Full Text
View/download PDF

Catalog

Books, media, physical & digital resources
See catalog results