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Nano-oxide dispersion-enhanced heat-resistant zirconium alloy and preparation method thereof

A nano-oxide and dispersion-enhancing technology, applied in the field of alloy materials, can solve the problems of limiting the service temperature and strength of zirconium alloys, poor thermal stability of intermetallic compounds, rapid coarsening of phases and grains, etc., and achieve excellent high-temperature mechanical properties. Easy to break, uniform and fine grains

Active Publication Date: 2021-06-11
CENT SOUTH UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

There are serious ingot segregation, uneven microstructure, and coarse grains. In addition, the thermal stability of intermetallic compounds is poor, and the precipitated phases and grains are prone to rapid coarsening under high temperature service conditions, which seriously limits the quality of zirconium. Alloy service temperature and strength and other issues

Method used

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  • Nano-oxide dispersion-enhanced heat-resistant zirconium alloy and preparation method thereof
  • Nano-oxide dispersion-enhanced heat-resistant zirconium alloy and preparation method thereof
  • Nano-oxide dispersion-enhanced heat-resistant zirconium alloy and preparation method thereof

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preparation example Construction

[0035] A method for preparing heat-resistant zirconium alloy reinforced by nanometer oxide dispersion, comprising the following steps:

[0036] Step S1, subjecting the zirconium alloy block to hydrodehydrogenation treatment to obtain pre-alloyed powder;

[0037] Specifically, the zirconium alloy block includes the following components by weight percentage:

[0038] Sn 1.2-1.6%, Fe 0.2-0.5%, Cr 0.1-0.3%, the balance is Zr and unavoidable impurities;

[0039] The hydrogenation adopts a gas tube furnace, and the hydrogenation temperature is 300-500°C. After hydrogenation, it is crushed by ball milling at a speed of 300rpm for 5-10 hours to obtain hydrogenated alloy powder; and then dehydrogenated at 300-500°C to obtain an average particle size of 5- 20μm, pre-alloyed powder with hydrogen content not exceeding 100ppm.

[0040] Step S2, putting the powder material and pre-alloyed powder containing Y, Ti, O elements into a high-speed pendulum vibration ball mill, and fully mixing ...

Embodiment 1

[0052] A method for preparing heat-resistant zirconium alloy reinforced by nanometer oxide dispersion, comprising the following steps:

[0053] Step S1, preparation of pre-alloyed powder: Put the zirconium alloy block into a gas tube furnace, hydrogenate it at 500°C to obtain a hydrogenated zirconium alloy block, put the hydrogenated zirconium alloy block into a ball mill at a speed of 300rpm, and ball mill for 5 hours to quickly crush it to obtain hydrogenation Alloy powder, hydrogenated alloy powder is dehydrogenated at 500°C to obtain pre-alloyed powder, the average particle size of the pre-alloyed powder is 5-20 μm, and the hydrogen content does not exceed 100 ppm;

[0054] Wherein the zirconium alloy block comprises the following composition by weight percentage:

[0055] Sn 1.3%, Fe 0.2%, Cr 0.1%, the balance is Zr and unavoidable impurities;

[0056] Step S2, powder pre-mixing: the pre-alloyed powder weight 0.4wt% TiO 2 Powder, 0.4wt% YH 2 Put the powder and the pre-...

Embodiment 2

[0065] Step S1, preparation of pre-alloyed powder: Put the zirconium alloy block into a gas tube furnace, hydrogenate it at 500°C to obtain a hydrogenated zirconium alloy block, put the hydrogenated zirconium alloy block into a ball mill at a speed of 300rpm, and ball mill for 5 hours to quickly crush it to obtain hydrogenation Alloy powder, hydrogenated alloy powder is dehydrogenated at 500°C to obtain pre-alloyed powder;

[0066] Wherein the zirconium alloy block comprises the following composition by weight percentage:

[0067] Sn 1.3%, Fe 0.2%, Cr 0.1%, the balance is Zr and unavoidable impurities;

[0068] Step S2, powder pre-mixing: pre-alloyed powder weight 0.4wt% Y 2 o 3 Powder, 0.4wt% TiH 2 Put the powder and the pre-alloyed powder into a high-speed pendulum ball mill for pre-mixing, the vibration time is 1h, the frequency is 1400rpm, and the mixed powder is obtained;

[0069] Step S3, mechanical alloying: put the mixed powder into a zirconia ball mill tank, and p...

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Abstract

The invention discloses a nano-oxide dispersion-enhanced heat-resistant zirconium alloy. The nano-oxide dispersion-enhanced heat-resistant zirconium alloy comprises a zirconium alloy matrix and Y-Ti-O and Y-Zr-O nano-oxide precipitated phases dispersed and distributed in the zirconium alloy matrix, wherein the granularity of the Y-Ti-O and Y-Zr-O nano-oxide precipitated phases is 2-10nm, and the number density of the Y-Ti-O and Y-Zr-O nano-oxide precipitated phases is 1-3 * 10 <15> / m< 2 >. According to the nano-oxide dispersion-enhanced heat-resistant zirconium alloy, a re-dissolution and re-precipitation mechanism of solute is realized through mechanical alloying and thermal densification modes, the Y-Ti-O and Y-Zr-O nano-oxide precipitated phases which are high in number density, low in nanoscale, high in thermal stability and dispersed and distributed are obtained in the zirconium alloy matrix, and the strength and heat resistance of the zirconium alloy can be greatly improved. The invention further provides a preparation method of the nano-oxide dispersion-enhanced heat-resistant zirconium alloy.

Description

technical field [0001] The invention relates to the technical field of alloy materials, in particular to a nano-oxide dispersion reinforced heat-resistant zirconium alloy and a preparation method thereof. Background technique [0002] Zirconium alloy has the advantages of low neutron absorption cross section, corrosion resistance, easy processing and good radiation stability, etc., and is widely used in the manufacture of core structural components such as nuclear reactor fuel cladding tubes. At present, zirconium alloys for nuclear use are all prepared by melting and casting methods, and precipitated phases of intermetallic compounds are formed after heat treatment to realize dispersion strengthening of the zirconium alloy matrix. There are serious ingot segregation, uneven microstructure, and coarse grains. In addition, the thermal stability of intermetallic compounds is poor, and the precipitated phases and grains are prone to rapid coarsening under high temperature servi...

Claims

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Application Information

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IPC IPC(8): C22C16/00B22F9/04B22F3/02B22F3/15C22C1/05C22C1/10
CPCC22C16/00C22C32/001B22F9/04B22F3/02B22F3/15C22C1/058B22F2009/043B22F2009/041
Inventor 江勇吴华建商佳程
Owner CENT SOUTH UNIV
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