National Research Institute for Metals

Hitachi, Ltd.

Michio Yamazaki

Hiroshi Harada

Shizuo Nakazawa

Toshihiro Yamagata

Yozo Kawasaki

Katsuyuki Kusunoki

Minoru Koizumi

Kiminori Sugauchi

The present invention provides a technique suitable for configuration management of a network for which the number of logical network layers can be set. A network management apparatusreceives an address definition information file defining logical hierarchical structure of an IPv6 network, from an operator through a definition information reception unit. A configuration analysis unitgenerates management tables defining hierarchical relationships of logical networks, based on the address definition information file and IP addresses collected respectively by an information collection unitfrom network elements belonging to the IPv6 network, and registers the management tables into a management DB unit

Network management apparatus and network management method

A gamma-prime precipitation hardening nickel-base yttria particle-dispersion-strengthened superalloy having a composition consisting essentially, by weight %, of 3.5 to 6.0 % of Al, 7.0 to 10.0 % of Co, 8.0 to 10.5 % of Cr, 0.5 to 1.5 % of Ti, 4.0 to 6.5 % of Ta, 7.0 to 9.0 % of W, 1.5 to 2.5 % of Mo, 0.02 to 0.2 % of Zr, 0.001 to 0.1 % of C, 0.001 to 0.02 % of B, 0.5 to 1.7 % of Y.sub.2 O.sub.3 and the balance being Ni. It has an excellent high-temperature creep rupture strength and a good corrosion resistance at high temperatures.

Gamma-prime precipitation hardening nickel-base yttria

A heat-resistant Ni-base single crystal alloy, suitable as a material for blades and vanes of gas turbines or jet engines, consists of, by weight, 5 to 10% of Co, 5 to 10% of Cr, 9 to 15% of W, 1 to 5% of Mo, 4.5 to 6% of Al, 5 to 10% of Ta, and the balance substantially of Ni with the total proportion of W, Mo and Ta being 17 to 24%, and is produced by directional solidification of a melt of the above-specified composition, followed by solution treatment and aging treatment.

Heat-resistant Ni-base single crystal alloy

A gamma-prime precipitation hardening nickel-base yttria particle-dispersion-strengthened superalloy having a composition consisting essentially of, by weight, 3.0 to 6.0% of Al, 8.5 to 10.9% of Co, 3.9 to 7.5% of Cr, 0.5 to 1.2% of Ti, 3.6 to 6.3% of Ta, 11.4 to 13.3% of W, 0.02 to 0.2% of Zr, 1.3 to 2.6% of Mo, 0.001 to 0.1% of C, 0.001 to 0.02% of B, 0.5 to 1.7% of yttria (Y.sub.2 O.sub.3), not more than 0.8% of O and the balance being Ni and having a structure composed of coarse recrystallized grains with a GAR of at least 20 and a short axis diameter of at least 0.5 mm, said alloy being produced by mechanically mixing a nickel carbonyl powder, element powders of Co, Cr, Ta, W and Mo, alloy powders of Ni--Al, Ni--Ti--Al, Ni--Zr and Ni--B, and a fine yttria powder in amounts to provide said composition, sealing the mixed powder into an extrusion can, extruding it, and subjecting the extruded material to zone annealing heat-treatment while its maximum temperature is within the range from its hardness softening temperature to its solidus temperature.

A nickel-base single crystal superalloy having high creep rupture strength at high temperatures, said superalloy being obtained by subjecting a single crystal alloy having a composition consisting essentially of, by weight,

Nickel-base single crystal superalloy and process for production thereof

Nickel-base alloys having superior creep strength and resistance to hot corrosion are disclosed.

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Zushi, Japan

Michio Yamazaki