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Your search keyword '"Yoichi Takizawa"' showing total 5 results
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5 results on '"Yoichi Takizawa"'

4. Enhancement of Activation and Hydrogen Storage Kinetics of TiFe(Mn) Using High-Pressure Sliding (HPS) Process.

Author

Zenji Horita, Yongpeng Tang, Motoaki Matsuo, Kaveh Edalati, Manabu Yumoto, and Yoichi Takizawa

Subjects
HYDROGEN storage, MATERIAL plasticity, STAINLESS steel, HYDROGENATION kinetics, INGOTS
Abstract

A titaniumiron intermetallic with minor addition of manganese (TiFe0.7Mn0.3) was processed by severe plastic deformation through highpressure sliding (HPS). A rectangular strip sample was embedded in stainless steel and strained under a pressure of 4 GPa at room temperature. The hydrogen storage kinetics and activation of the HPS-processed sample were significantly enhanced in comparison with the as-received ingot without the HPS processing. [ABSTRACT FROM AUTHOR]

Published
2023
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5. Creep Resistance of S304H Austenitic Steel Processed by High-Pressure Sliding

Author

Petr Kral, Jiri Dvorak, Vaclav Sklenicka, Zenji Horita, Yoichi Takizawa, Yongpeng Tang, Lubomir Kral, Marie Kvapilova, Pavla Roupcová, and Jakub Horvath

Subjects
Technology, Microscopy, QC120-168.85, austenitic steels, creep properties, severe plastic deformation, QH201-278.5, Engineering (General). Civil engineering (General), Article, TK1-9971, Descriptive and experimental mechanics, General Materials Science, Electrical engineering. Electronics. Nuclear engineering, TA1-2040
Abstract

Sheets of coarse-grained S304H austenitic steel were processed by high-pressure sliding (HPS) at room temperature and a ultrafine-grained microstructure with a mean grain size of about 0.14 µm was prepared. The microstructure changes and creep behavior of coarse-grained and HPS-processed steel were investigated at 500–700 °C under the application of different loads. It was found that the processing of S304H steel led to a significant improvement in creep strength at 500 °C. However, a further increase in creep temperature to 600 °C and 700 °C led to the deterioration of creep behavior of HPS-processed steel. The microstructure results suggest that the creep behavior of HPS-processed steel is associated with the thermal stability of the SPD-processed microstructure. The recrystallization, grain growth, the coarsening of precipitates led to a reduction in creep strength of the HPS-processed state. It was also observed that in the HPS-processed microstructure the fast formation of σ-phase occurs. The σ-phase was already formed during slight grain coarsening at 600 °C and its formation was enhanced after recrystallization at 700 °C.

Published
2022

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