Specialized metallurgical processes – compositions for use therei – Compositions – Consolidated metal powder compositions
Reexamination Certificate
2003-09-26
2010-02-16
King, Roy (Department: 1793)
Specialized metallurgical processes, compositions for use therei
Compositions
Consolidated metal powder compositions
C075S232000, C075S244000
Reexamination Certificate
active
07662207
ABSTRACT:
The invention provides a super hard and tough, nano-crystal austenite steel bulk material having an improved corrosion resistance, and its preparation process.The austenite steel bulk material comprises an aggregate of austenite nano-crystal grains containing 0.1 to 2.0% (by mass) of a solid solution type nitrogen, wherein an oxide, nitride, carbide or the like of a metal or semimetal exists as a crystal grain growth inhibitor between and/or in said nano-crystal grains.For preparation, fine powders of austenite steel-forming components, i.e., iron and chromium, nickel, manganese, carbon or the like are mixed with a substance that becomes a nitrogen source. Mechanical alloying (MA) is applied to the mixture, thereby preparing nano-crystal austenite steel powders having a high nitrogen concentration. Finally, the austenite steel powders are consolidated by sintering by means of spark plasma sintering, rolling or the like.
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Current Advances in Materials and Processes, vol. 13, No. 3, (2002), pp. 362 to 363.
Harumatsu Miura, “Mechanical Alloying ni yori Sakusei shita Kochiso Nano Kessho Austentite Stainless-ko Funmatsu no Neddan Koka Seikei Katei deno Chisso no Kyodo”, Current Advances in Materials and Processes, vol. 15, No. 3, (2002), pp. 454 to 457.
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Harumatsu Miura,, Preparation of Nanocrystalline High-Nitrogen Stainless Steel Powders by Mechanical Alloying and Their HotCompaction, Materials Transactions, vol. 42, No. 11, (2001), pp. 2368 to 2373.
Miura H et al, “Composition Dependence of Microstructure of Mechanically Alloyed Powders and Their Compacts of High Nitrogen CR-MN Steels”, Materials Transactions, Jim, Sendai, JP, vol. 40, No. 9, Sep. 1999, pp. 907-910.
Katsumura Munehide
Miura Harumatsu
Miyao Nobuaki
Mizutani Masaru
Oda Kazuo
King Roy
Mai Ngoclan T
Nano Technology Institiute, Inc.
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