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Process for producing oxide dispersion strengthening ferrite type alloy by using chemical dipping method

A dispersion strengthening and oxide technology, applied in the field of neutron breeder reactor fuel cladding, can solve the problems of cold working anisotropy, high recrystallization annealing temperature, etc., achieve excellent room temperature and medium temperature tensile properties, and improve cold processed finished products The effect of uniform rate and grain size

Inactive Publication Date: 2005-09-07
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a method for manufacturing oxide dispersion strengthened ferrite ODS alloy by chemical infiltration method, which solves the problems of cold working anisotropy and high recrystallization annealing temperature that cannot be solved by mechanical alloying method

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0010] Actual production of Fe-11.5Cr-1.5W-0.4Ti-0.35Y by CSM method 2 o 3 alloy.

[0011] Melt pure Fe-Cr alloy, W, and Ti elements in a vacuum induction furnace (50Kg) to form a qualified master alloy, and use a nitrogen atomization device to prepare master alloy powder. 3 ) 3 ·6H 2 O solution impregnated the pre-alloyed powder, placed at room temperature for 4 hours, dried to become wetted powder, and kept the wetted powder at 400°C for 1.5 hours under the protection of hydrogen to make Y(NO 3 ) 3 ·6H 2 O decomposes into Y 2 o 3 (0.3%), put the decomposed powder into a low-carbon steel ladle with a diameter of 82mm, vacuumize it and seal it, then heat it in 105Mpa argon at 1100-1250°C for 2-4 hours and then air-cool it. After peeling off the cladding layer, a hot isostatically pressed alloy with a diameter of 65mm was obtained. The alloy was forged into a Φ25mm long rod at 1150°C-850°C, and solidified at 1150°C for 1.5 hours in air cooling. The room temperature and ...

Embodiment 2

[0013] Actual production of Fe-12Cr-2W-0.45Ti-0.4Y by CSM method 2 o 3 alloy.

[0014] Melt pure Fe-Cr alloy, W, and Ti elements in a vacuum induction furnace (50Kg) to form a qualified master alloy, and use a nitrogen atomization device to prepare master alloy powder. 3 ) 3 ·6H 2 O solution impregnated the pre-alloyed powder, left it at room temperature for 4.5 hours, dried to become wetted powder, and kept the wetted powder at 450°C for 2 hours under the protection of hydrogen to make Y(NO 3 ) 3 ·6H 2 O decomposes into Y 2 o 3 (0.4%), put the decomposed powder into a low-carbon steel ladle with a diameter of 82mm, vacuumize it and seal it, then heat it in 100Mpa argon at 1100-1250°C for 3 hours and then air-cool it. After peeling off the casing layer, a hot isostatically pressed alloy with a diameter of 65.5mm was obtained. The alloy was forged into a Φ25mm long rod at 1150°C-850°C, and solidified at 1100°C for 2 hours in air cooling. The room temperature and high te...

Embodiment 3

[0016] Actual production of Fe-12.5Cr-2.5W-0.5Ti-0.45Y by CSM method 2 o 3 alloy.

[0017] Melt pure Fe-Cr alloy, W, and Ti elements in a vacuum induction furnace (50Kg) to form a qualified master alloy, and use a nitrogen atomization device to prepare master alloy powder. 3 ) 3 ·6H 2 O solution infiltrates the pre-alloyed powder, places it at room temperature for 4.5 hours, and dries to become a wetted powder. The wetted powder is kept at 450°C for 2.5 hours under the protection of hydrogen to make Y(NO 3 ) 3 ·6H 2 O decomposes into Y 2 o 3 (0.50%), put the decomposed powder into a low-carbon steel ladle with a diameter of 82mm, vacuumize it and seal it, then heat it in 110Mpa argon at 1100-1250°C for 2-4 hours and then air-cool it. After peeling off the cladding layer, a hot isostatically pressed alloy with a diameter of 65.8mm was obtained. The alloy was forged into a Φ25mm long rod at 1150°C-850°C, and solidified at 1250°C for 1.5 hours in air cooling. The room tem...

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Abstract

The present invention provides a dispersion strengthening method of ferrite alloy using oxide by chemical retting, which belongs to dispersion strengthening area of ferrite alloy using oxide and is adapt for fuel can in fast neutron breeder in nuclear energy domain. Placing master alloy powder in solution of Y(NO3)3.6H2O to soak, drying and heating the powder to get intensified phase of oxide, encasing disintegrating powder into jacket, sealing in vacuum, shaping with heat, forging and processing with solid solution treatment to get alloy of ODS that contains Y2O3 intensified phase. Invention realizes reasonable dispersion distribution of intensified phase Y2O3 of oxide. Ferrite alloy with rational adaption assistance, used as fuel can in nuclear energy fast reactor, has the properties of low plumping, low radioactivity, fine elevated temperature strength, few aeolotropism in cold working and low annealing recrystallization temperature. The invention can reduce the cost greatly and improve product quality.

Description

technical field [0001] The invention belongs to the technical field of oxide dispersion-strengthened ferrite alloy materials, and in particular provides a method for manufacturing oxide dispersion-strengthened ferrite alloys by a chemical infiltration method, which is suitable for fuel cladding of fast neutron breeder reactors in the field of nuclear energy. technical background [0002] Oxide Dispersion Strengthened (ODS: Oxide Dispersion Strengthened) is usually produced by mechanical alloying (MA: Mechanical Alloying), but the structure and performance of this method are different in the extruded state and incompletely recrystallized annealed state. Anisotropy is not only very significant under high temperature creep conditions under tensile stress, but also under room temperature conditions under compressive stress, resulting in extremely poor cold deformation ability of the alloy perpendicular to the extrusion direction. It is an important reason for cracking along the ...

Claims

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Application Information

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IPC IPC(8): C22C33/02
Inventor 胡本芙彭顺米吴承建章守华
Owner UNIV OF SCI & TECH BEIJING
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