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Zirconium alloy with high-strength and high-plasticity heterostructure and a preparation method thereof

A heterogeneous structure, zirconium alloy technology, applied in the direction of metal rolling, etc., can solve the problems of alloy lack of plasticization mechanism, limited laser treatment depth, limited improvement of alloy mechanical properties, etc., to achieve improved plasticity, simple process, and plasticity Improved effect

Active Publication Date: 2022-01-28
XI AN JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This heterogeneous structure, which gradually changes from the surface to the core microstructure, is conducive to the improvement of the alloy properties, but the depth of laser treatment is limited, and the improvement of the mechanical properties of the alloy is also limited.
Chinese invention patent CN202010879410.3 introduces a method of obtaining a heterogeneous structure in which the primary α phase and α' martensite phase are mixed by rolling and heat treatment. The two phases of this structure are evenly distributed, and a large amount of α' martensite makes the alloy stronger. sufficiently improved, but this alloy lacks an effective plasticizing mechanism

Method used

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  • Zirconium alloy with high-strength and high-plasticity heterostructure and a preparation method thereof
  • Zirconium alloy with high-strength and high-plasticity heterostructure and a preparation method thereof
  • Zirconium alloy with high-strength and high-plasticity heterostructure and a preparation method thereof

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preparation example Construction

[0028] A method for preparing a high-strength plastic heterogeneous structure zirconium alloy, comprising the following steps:

[0029] Step 1. Heating the β-quenched zirconium alloy to 620°C-730°C for 3h-48h, and then cooling to room temperature to obtain the α-phase and the highly stable β-phase;

[0030] Step 2, heating the zirconium alloy obtained in step 1 to 750 ° C ~ T β Finally, heat preservation for 10min-40min, followed by high-temperature rolling deformation with a reduction of 30%-80%, and a heterogeneous structure zirconium alloy is obtained after cooling.

[0031] The cooling method after rolling deformation is water cooling or oil cooling.

[0032] The temperature of the cooling water is from room temperature to 100°C. The temperature of the cooling oil is from room temperature to 250°C.

[0033] According to the heterostructure zirconium alloy obtained by the above preparation method, the structure of the heterostructure zirconium alloy includes micron equia...

Embodiment 1

[0035] A preparation method of a high-strength plastic heterogeneous structure zirconium alloy is carried out according to the following steps:

[0036] Step 1, heating the β-quenched zirconium alloy to 620° C. for 12 hours, and then cooling to room temperature;

[0037] Step 2. Heat the zirconium alloy obtained in step 1 to 870°C and keep it warm for 20 minutes, then perform high-temperature rolling deformation with a reduction of 75%, and cool to room temperature in room temperature oil after rolling.

[0038] The microstructure of the alloy obtained in this example is as follows: figure 1 As shown, the phase distribution is as figure 2 As shown, the micron equiaxed α primary phase, the submicron flaky α’ martensite phase and the submicron equiaxed β phase are uniformly distributed. The alloy strength-plasticity curve after the process of the present invention is as follows image 3 As shown, it shows a very high strength / plasticity combination, the tensile strength reac...

Embodiment 2

[0040] A preparation method of a high-strength plastic heterogeneous structure zirconium alloy is carried out according to the following steps:

[0041] Step 1, heating the β-quenched zirconium alloy to 680° C. for 48 hours, and then cooling to room temperature;

[0042] Step 2. Heat the zirconium alloy obtained in step 1 to 870°C and keep it warm for 20 minutes, then perform high-temperature rolling deformation with a reduction of 75%, and cool to room temperature in room temperature oil after rolling.

[0043] The zirconium alloy prepared by this process shows extremely high strength / plasticity combination, the tensile strength reaches 941MPa, and the uniform elongation still reaches 5.3%.

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Abstract

The invention discloses a zirconium alloy with a high-strength and high-plasticity heterostructure and a preparation method thereof. The preparation method comprises the steps that beta-quenched zirconium alloy is heated to 620-730 DEG C, heat preservation is conducted for 3-48 h for a long time, the beta-quenched zirconium alloy is cooled to the room temperature, and an alpha phase and a beta phase with very high stability are obtained; and then, the alloy is heated to 750 DEG C to Tbeta, heat preservation is conducted for 10 min-40 min, then high-temperature rolling deformation with the rolling reduction being 30%-80% is conducted, rapid cooling is conducted through water or oil after rolling deformation, the temperature of cooling water ranges from room temperature to 100 DEG C, and the temperature of cooling oil ranges from room temperature to 250 DEG C. The heterostructure zirconium alloy prepared through the method not only comprises a micron-order equiaxed alpha primary phase and a submicron-order flaky alpha' martensite phase, but also comprises an equiaxed metastable beta phase, and compared with a traditional method, the strength of the zirconium alloy prepared through the method is kept at 950 MPa, and meanwhile the plasticity is improved by 40% or above compared with the plasticity of the zirconium alloy prepared through the traditional method.

Description

technical field [0001] The invention belongs to the field of metal materials, and relates to a high-strength plastic heterogeneous structure zirconium alloy and a preparation method thereof. Background technique [0002] Due to its low neutron absorption cross section, good corrosion resistance and mechanical properties, zirconium alloy is currently the only commercial nuclear reactor cladding material, and it is an irreplaceable key structure for the development of nuclear power and nuclear powered ships. At the same time, with the gradual extension of the refueling cycle of nuclear reactor core fuel, the gradual increase of reactor operating power, and the improvement of safety and reliability, the service performance of existing zirconium alloy cladding tube materials, especially the mechanical properties (<500MPa) Therefore, the research and development of zirconium alloy materials with better mechanical properties has become one of the problems that need to be solved...

Claims

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Application Information

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IPC IPC(8): C22F1/18C22C16/00B21B3/00
CPCC22F1/186C22C16/00B21B3/00Y02E30/30
Inventor 张金钰刘帅洋刘刚孙军
Owner XI AN JIAOTONG UNIV