Tohoku University and Hitachi, Ltd. have developed Ni-base and Co-base materials which withstand steam temperature around 800°C as coal-fired power plant materials and have produced trial models of large forgings and equipment. By optimal dispersion of metal compounds (Ni3Al, Co3(Al,W)), the research group has improved high-temperature strength of these materials and has reduced their casing defects. They have produced large forgings and equipment using large castings such as tubes of boiler and turbine rotor blade materials, by utilizing Ni-base materials they developed. They have confirmed that there is no macro segregation in these products and that the products can be produced on the normal production line. In addition, the group has also produced large forgings using Co-base materials, and has found that their manufacturability and high-temperature strength are compatible. Ni-base materials are expected to be applied to large-size components, and Co-base materials are expected to be applied to middle-size and high-strength components.

More information (Japanese)

[Contact]

Department of Metallurgy

Graduate School of Engineering, Tohoku University

Address: 6-6-2 Aoba Aramaki Aoba-ku Sendai, Miyagi, 980-8579, Japan

Assistant Professor Toshihiro Omori

TEL: +81-22-795-7323

e-mail：omori*material.tohoku.ac.jp (Replace * with @)

Professor Emeritus Kiyohito Ishida

TEL: +81-22-795-3984

e-mail：ishida*material.tohoku.ac.jp (Replace * with @)