Method for preparing nitrogen-contained ODS (oxide dispersion strengthened) nickel-free austenite alloy by mechanical alloying process

A mechanical alloying and ODS technology, which is applied in the field of preparing nitrogen-containing ODS nickel-free austenitic alloys by mechanical alloying, can solve the problems of high cost, complicated equipment, and difficult process control, and achieve high sphericity and high density , the effect of uniform composition

Inactive Publication Date: 2012-12-19
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
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Problems solved by technology

The general disadvantages of these methods are com...

Method used

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Experimental program
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Effect test

Embodiment 1

[0022] The raw materials used in the experiment are pure metal powder of Fe, Cr, Mn, W, Ti, Al and nano Y 2 o 3 Powder, the purity of the powder used is greater than 99.9%. Among them, the particle size of Fe, Cr, Mn, Ti, Al powder is -200 mesh, the average particle size of W powder is 2 μm, Y 2 o 3 The average particle size of the powder is 30 nm. The above powder is distributed according to the composition ratio (Cr: 18%, Mn: 20%, W: 1.5%, Al: 2.5%, Ti: 0.5%, Y 2 o 3 : 0.4%, the balance is Fe) respectively weighed and mixed and put into the ball mill jar, and filled with nitrogen after vacuuming, the pressure of filling nitrogen is 0.5atm. The ball milling time is controlled to 60h. The actual nitrogen content of the powder is 0.52% measured by the falling gas pulse infrared thermal conductivity method (ASTME1019-2003); the nitrogen-containing ODS nickel-free austenitic stainless steel is obtained after hot isostatic sintering of the mechanically alloyed powder. The s...

Embodiment 2

[0024] The raw materials used in the experiment are pure metal powder of Fe, Cr, Mn, W, Ti, Al and nano Y 2 o 3 Powder, the purity of the powder used is greater than 99.9%. Among them, the particle size of Fe, Cr, Mn, Ti, Al powder is -200 mesh, the average particle size of W powder is 2 μm, Y 2 o 3 The average particle size of the powder is 30 nm. The above powder is distributed according to the composition ratio (Cr: 17%, Mn: 22%, W: 2%, Al: 4%, Ti: 0.75%, Y 2 o 3: 0.6%, the balance is Fe) respectively weighed and mixed and put into a ball mill jar, and filled with nitrogen after vacuuming, the pressure of filling nitrogen is 1atm. The ball milling time is controlled as 30h. The actual nitrogen content of the powder is 0.35% measured by the falling gas pulse infrared thermal conductivity method (ASTME1019-2003); the nitrogen-containing ODS nickel-free austenitic stainless steel is obtained after hot isostatic sintering of the mechanically alloyed powder. The sintering...

Embodiment 3

[0026] The raw materials used in the experiment are pure metal powder of Fe, Cr, Mn, W, Ti, Al and nano Y 2 o 3 Powder, the purity of the powder used is greater than 99.9%. Among them, the particle size of Fe, Cr, Mn, Ti, Al powder is -200 mesh, the average particle size of W powder is 2 μm, Y 2 o 3 The average particle size of the powder is 30 nm. The above powder is distributed according to the composition ratio (Cr: 19%, Mn: 21%, W: 1.75%, Al: 3%, Ti: 1.0%, Y 2 o 3 : 0.0.35%, and the balance is Fe) Weigh and mix them respectively and put them into the ball mill jar, vacuumize and fill with nitrogen, the pressure of filling nitrogen is 0.75atm. The ball milling time is controlled to 90h. The actual nitrogen content of the powder is 0.78% measured by the falling gas pulse infrared heat conduction method (ASTME1019-2003); the nitrogen-containing ODS nickel-free austenitic stainless steel is obtained after hot isostatic pressing of the mechanically alloyed powder. The si...

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Abstract

The invention discloses a method for preparing nitrogen-contained ODS (oxide dispersion strengthened) nickel-free austenite alloy by a mechanical alloying process, which comprises the following steps of: mixing pure metal element powder of Fe, Cr, Mn, W, Ti and Al and nanometer Y2O3 powder in the following mass ratio: 17-20% of Cr, 18-22% of Mn, 1.5-2.5% of W, 2-4% of Al, 0.5-1.0% of Ti, 0.3-0.6% of Y2O3 and the balance of Fe; loading into a ball-milling tank of a horizontal planetary high-energy ball mill; after the is vacuumized, filling the ball-milling tank with high-purity nitrogen; controlling the pressure at 0.1-1atm; carrying out ball milling for 30-90 hours, wherein the ball mill is shut down for 1 hour in every five hours of ball milling; obtaining the ODS nickel-free austenite alloy powder of which the nitrogen content is 0.1-0.8%; and sintering to obtain the ODS nickel-free austenite alloy. According to the nickel-free austenite alloy, the solid solution strengthening of nitrogen and oxide dispersion strengthening can be simultaneously realized, and the service capability of the nickel-free austenite stainless steel under the high-temperature environment can be improved to a great extent.

Description

[0001] Technical field: [0002] The invention belongs to the technical field of oxide dispersion strengthened (Oxide Dispersion Strengthened, ODS) alloy preparation, and in particular provides a mechanical alloying of oxide, nitrogen, pure metal powder or pre-alloyed powder through high-energy ball milling to obtain a near-spherical Nitrogen-containing ODS nickel-free alloy powder, which is compacted by hot isostatic sintering. A method for preparing nitrogen-containing ODS nickel-free austenitic alloy by mechanical alloying. [0003] Background technique: [0004] Austenitic stainless steel has become one of the candidate materials for the fuel cladding of fourth-generation nuclear reactors, such as supercritical water-cooled reactors, due to its good comprehensive mechanical properties, excellent corrosion resistance, oxidation resistance, and easy processing. However, the high-temperature mechanical properties and high-temperature creep resistance of austenitic stainles...

Claims

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Application Information

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IPC IPC(8): C22C33/02C22C38/38
Inventor 周张健许迎利王曼陈万华
Owner UNIV OF SCI & TECH BEIJING
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