Hitachi, Ltd.

Yusaku Maruno

Takahiro Ishizaki

Kinya Aota

Tomonori Kimura

Kazumasa Ide

Yasuhisa Aono

Motonobu Iizuka

Tetsuo Fujigaki

Makoto Ogata

Kengo Iwashige

Masafumi Noujima

Naoya Okizaki

Shuji Mizutani

Mamoruo Kimura

Hisato Tagawa

Yingjuan Yang

An austenitic stainless steel includes a mixed grain structure composed of a columnar crystal having an average crystal grain size of 20 &#x3bc;m or less and an equiaxed crystal having an average crystal grain size of 5.0 &#x3bc;m or less, in which an area proportion of the columnar crystal in the mixed grain structure is 20% or more, and an average crystal grain size of the whole mixed grain structure is 5.0 &#x3bc;m or less. Accordingly, it is possible to provide a material having excellent irradiation resistance and mechanical properties.

Austenitic stainless steel and reactor internal structure

An objective of the invention is to provide an austenitic stainless steel article having superior irradiation resistance and stress corrosion cracking resistance than before while maintaining mechanical properties equivalent to those of conventional ones. There is provided a dispersion strengthened austenitic stainless steel article, including: 16-26 mass % of Cr; 8-22 mass % of Ni; 0.005-0.08 mass % of C; 0.002-0.1 mass % of N; 0.02-0.4 mass % of O; at least one of 0.2-2.8 mass % of Zr, 0.4-5 mass % of Ta, and 0.2-2.6 mass % of Ti; and a balance consisting of Fe and inevitable impurities. The Zr, Ta and Ti components form inclusion particles in the stainless steel article by combining with the C, N and O components. The stainless steel article has an average grain size of 1 &#x3bc;m or less and a maximum grain size of 5 &#x3bc;m or less.

Dispersion strengthened austenitic stainless steel article, method for manufacturing same and product made of same

An object of the invention is to provide: a two-phase alloy as a metal material that can be preferably utilized under circumstances of a temperature range and a high corrosion as in an oil well, the two-phase alloy having a high corrosion resistance and good mechanical properties that are equivalent or more than those of conventional ones, and saving a cost; a product of the two-phase alloy; and a method for producing the product. There is provided a two-phase alloy containing Cr as a major component and including two phases of an austenite phase and a ferrite phase in a mixed state. The alloy has a chemical composition containing: 34-70 mass % of Cr; 17-45 mass % of Ni; 10-35 mass % of Fe; 0.1-2 mass % of Mn; 0.1-1 mass % of Si; and impurities. The total content of the Ni and the Fe is 30-65 mass %.

Two-phase alloy, product using said two-phase alloy, and method for producing said product

A permanent magnet type electric rotating machine comprises a stator having a distributed winding and a permanent magnet rotor, wherein the permanent magnet rotor is provided with a wind passage in an axial direction thereof.

Permanent magnet type electric rotating machine and wind turbine electric power generation system

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Tokyo, Japan

Yusaku Maruno