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Title:
NANO-CRYSTAL AUSTENITIC STEEL BULK MATERIAL HAVING ULTRA-HARDNESS AND TOUGHNESS AND EXCELLENT CORROSION RESISTANCE, AND METHOD FOR PRODUCTION THEREOF
Document Type and Number:
WIPO Patent Application WO/2004/029312
Kind Code:
A1
Abstract:
A nano-crystal austenitic steel bulk material which comprises an aggregate of austenitic nano crystal grains containing 0.1 to 2.0 mass % of nitrogen of solid solution type, wherein it further comprises an oxide, nitride, carbide or the like of a metal or metalloid between the above nano crystal grains and/or inside of the grain as a substance inhibiting the growth of the crystal grain; and a method of producing the above steel bulk material, which comprises admixing fine powders of iron and a component for forming an austenitic steel such as chromium, nickel, manganese or carbon together with a nitrogen source, subjecting the resultant mixture to mechanical alloying (MA), to prepare a nano-crystal austenitic steel powder having a high nitrogen concentration, and then subjecting the austenitic steel powder to a massing and forming treatment by spark plasma sintering, rolling or the like. The nano-crystal austenitic steel bulk material exhibits ultra-hardness and toughness and also excellent corrosion resistance.

Inventors:
Miura, Harumatsu (6-5-13-203, Nogami Takarazuka-Shi, Hyogo, 665-0022, JP)
Miyao, Nobuaki (20-19, Narita-higashimachi Neyagawa-Shi, Osaka, 572-0001, JP)
Ogawa, Hidenori (2-7-27, Shojyaku Settsu-Shi, Osaka, 566-0023, JP)
Oda, Kazuo (3032-5, Oaza-nago Abuch, Abu-Gun Yamaguchi, 759-3622, JP)
Katsumura, Munehide (477-22, Takamatsu-Cho Takamatsu-Shi, Kagawa, 761-0104, JP)
Mizutani, Masaru (2-56-12, Denenchofu Oota-Ku, Tokyo, 145-0071, JP)
Application Number:
PCT/JP2003/012343
Publication Date:
April 08, 2004
Filing Date:
September 26, 2003
Export Citation:
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Assignee:
NANO TECHNOLOGY INSTITUTE, INC (2233, Aza-Kajigahara Oaza-Chint, Hagi-Shi Yamaguchi, 758-0011, JP)
Miura, Harumatsu (6-5-13-203, Nogami Takarazuka-Shi, Hyogo, 665-0022, JP)
Miyao, Nobuaki (20-19, Narita-higashimachi Neyagawa-Shi, Osaka, 572-0001, JP)
Ogawa, Hidenori (2-7-27, Shojyaku Settsu-Shi, Osaka, 566-0023, JP)
Oda, Kazuo (3032-5, Oaza-nago Abuch, Abu-Gun Yamaguchi, 759-3622, JP)
Katsumura, Munehide (477-22, Takamatsu-Cho Takamatsu-Shi, Kagawa, 761-0104, JP)
Mizutani, Masaru (2-56-12, Denenchofu Oota-Ku, Tokyo, 145-0071, JP)
International Classes:
B22F1/00; B22F3/00; B22F9/00; C22C33/02; (IPC1-7): C22C33/02; B22F1/00; B22F3/24; C21D6/00
Foreign References:
JPH1088289A1998-04-07
JPH1143748A1999-02-16
EP1234894A12002-08-28
Other References:
HARUMATSU MIURA: 'Mechanical alloying ni yori sakusei shita Kochiso Nano Kessho Austenite stainless-ko Funmatsu no Nekkan Koka Seikei Katei deno Chisso no Kyodo' CURRENT ADVANCES IN MATERIALS AND PROCESSES vol. 15, no. 3, 2002, pages 454 - 457, XP002977418
HARUMATSU MIURA: 'Mechanical Alloying ni Yotte sakusei shita Kochiso Stainless-ko Funmatsu no Austenite-ka to Koka seikei' CURRENT ADVANCES IN MATERIALS AND PROCESSES vol. 13, no. 3, 2000, pages 362 - 363, XP002977419
HARUMATSU MIURA: 'Preparation of nanocrystalline high-Nitrogen Stainless Steel Powders by Mechanical Alloying and Their HotCompaction' MATERIALS TRANSACTIONS vol. 42, no. 11, 2001, pages 2368 - 2373, XP002977420
See also references of EP 1555332A1
Attorney, Agent or Firm:
Murata, Yukio (TOKYO-CHIZAI PATENT OFFICE, Kita-yaesu Bldg. 3rd Floor 2-11, Nihonbashi 3-Chom, Chuo-Ku Tokyo, 103-0027, JP)
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