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Method for performing thermal treatment on zirconium alloy

A heat treatment method and zirconium alloy technology, which is applied in the field of metal heat treatment, can solve problems such as the adverse effects of zirconium alloy related properties, and achieve the effects of eliminating structural defects, increasing driving force, and improving irregularities

Inactive Publication Date: 2012-07-18
CHONGQING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Both the banded distribution of the second phase particles and the uneven grain structure will have an adverse effect on the relevant properties of the zirconium alloy

Method used

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  • Method for performing thermal treatment on zirconium alloy
  • Method for performing thermal treatment on zirconium alloy
  • Method for performing thermal treatment on zirconium alloy

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] Please refer to figure 2 , the zirconium alloy heat treatment method provided by the embodiment of the present invention comprises the following steps:

[0033] S10) performing a quenching treatment on the zirconium alloy blank to obtain a quenched blank;

[0034] S20) cooling the quenched blank to room temperature, and then performing deformation treatment with a deformation amount of 20%, that is, pre-deformation treatment at room temperature, to obtain a pre-deformed blank;

[0035] S30) heating the pre-deformed blank to 650° C. for the first annealing treatment, and the annealing time is 30 hours;

[0036] S40) hot-rolling the pre-deformed blank after the first annealing treatment to obtain a plate blank;

[0037] S50) performing intermediate annealing on the plate blank, and performing cold working after the intermediate annealing;

[0038] S60) Repeat step S50) several times until the outer dimensions of the plate blank meet the processing requirements, and ob...

Embodiment 2

[0044] After the quenching treatment, the zirconium alloy blank is pre-deformed at room temperature with a deformation amount of 20%, and then annealed for the first time. The annealing temperature is set at 650° C. and the annealing time is 1.5 hours. After the above treatment, the zirconium alloy is subjected to hot rolling, 2 times of intermediate annealing, cold working after each intermediate annealing, and finally recrystallization annealing to obtain a finished plate. Similarly, by conducting metallographic analysis, we obtained Figure 5-1 , the metallographic diagram of the second phase distribution of the zirconium alloy, and Figure 5-2 , grain size metallographic diagram of zirconium alloys. Separate it with Figure 3-1 , Figure 3-2 In contrast, it is obvious that after the zirconium alloy is treated by the method provided in Example 2 of the present invention, the particles of the second phase of the zirconium alloy energy are diffusely distributed, and at the sa...

Embodiment 3

[0046] After the quenching treatment, the zirconium alloy blank is pre-deformed at room temperature with a deformation amount of 10%, and then annealed for the first time. The annealing temperature is set at 450° C. and the annealing time is 10 hours. After the above treatment, the zirconium alloy is subjected to hot rolling, 3 times of intermediate annealing and cold working after each intermediate annealing, and finally recrystallization annealing treatment to obtain a finished plate. Similarly, through metallographic analysis, it is found that after the zirconium alloy is treated by the method provided in the embodiment of the present invention, the second phase particles of the zirconium alloy energy are dispersedly distributed, and at the same time, the grain size of the zirconium alloy is fine and uniform.

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Abstract

The invention discloses a method for performing thermal treatment on zirconium alloy. The method comprises the following steps of: firstly, quenching a zirconium alloy blank to obtain a quenched blank; secondly, cooling the quenched blank to room temperature, and deforming the quenched blank until the deformation degree is 5 to 30 percent, namely pre-deforming the quenched blank at room temperature to obtain a pre-deformed blank; heating the pre-deformed blank to 350 to 700 DEG C, and annealing for 0.2 to 30 hours for the first time; thirdly, performing hot-rolling on the pre-deformed blank; fourthly, annealing repeatedly, and performing cold machining to obtain a plate; and finally, re-crystallizing and annealing the plate to obtain the finished product plate. Compared with the traditional method for performing thermal treatment on the zirconium alloy, the method for performing thermal zirconium alloy fulfils the aim of distributing second phase particles of the zirconium alloy in a dispersing way and improving the size uniformity of crystal particles of the zirconium alloy.

Description

technical field [0001] The invention relates to the technical field of metal heat treatment, in particular to a heat treatment method for zirconium alloys. Background technique [0002] Zirconium alloy has the characteristics of small thermal neutron absorption cross section, high thermal conductivity, good processing performance, and resistance to high temperature and high pressure water and water vapor corrosion. It is widely used as cladding material and core structure material of water-cooled power reactors in nuclear power plants. With the development of nuclear reactor technology toward improving fuel consumption, reactor thermal efficiency, safety and reliability, and reducing fuel cycle costs, higher requirements are placed on the performance of zirconium alloy cladding materials, including corrosion resistance, mechanical properties and radiation. Dimensional stability etc. These properties of zirconium alloys are closely related to their microstructure (such as gr...

Claims

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Application Information

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IPC IPC(8): C22F1/18
Inventor 栾佰峰柴林江刘庆
Owner CHONGQING UNIV
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