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Method for weakening zirconium alloy plate texture through phase-change treatment

A technology of phase change treatment and zirconium alloy, which is applied in the field of zirconium alloy processing, to achieve the effect of obvious change pattern, reduced texture strength and stable texture

Active Publication Date: 2017-08-18
CHONGQING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] In view of the above-mentioned deficiencies in the prior art, the purpose of the present invention is to provide a method for weakening the texture of zirconium alloy plates through phase change treatment, to solve the problem of how to reduce the anisotropy of zirconium alloy plates, thereby improving its performance

Method used

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  • Method for weakening zirconium alloy plate texture through phase-change treatment
  • Method for weakening zirconium alloy plate texture through phase-change treatment
  • Method for weakening zirconium alloy plate texture through phase-change treatment

Examples

Experimental program
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Effect test

Embodiment 1

[0028] Use 800#, 1200#, 2000# and 4000# sandpaper to polish each surface of the above-mentioned Zr702 zirconium alloy plate brightly, and then immerse the sample as a whole in a solution composed of 45% nitric acid, 45% hydrofluoric acid and 10% distilled water (volume fraction). Corrosion mixed solution, shake the solution continuously at the same time, take out the sample after corrosion for 10s, wash the surface of the sample with water and absolute ethanol in sequence, and finally dry the surface until there is no trace of water stain on the surface of the sample.

[0029] Vacuum-seal the sample after surface cleaning in a quartz glass tube, and the vacuum degree in the quartz tube during the sealing process is P=2×10 -3 Pa, to ensure that no reactions such as oxidation and hydrogen absorption occur on the surface of the sample during the subsequent high-temperature heat treatment.

[0030] Put the vacuum-sealed sample into a box-type heat treatment furnace heated to 950°...

Embodiment 2

[0033] Use 800#, 1200#, 2000# and 4000# sandpaper to polish each surface of the above-mentioned Zr702 zirconium alloy plate brightly, and then immerse the sample as a whole in a solution composed of 45% nitric acid, 45% hydrofluoric acid and 10% distilled water (volume fraction). Corrosion mixed solution, shake the solution continuously at the same time, take out the sample after corrosion for 10s, wash the surface of the sample with water and absolute ethanol in sequence, and finally dry the surface until there is no trace of water stain on the surface of the sample.

[0034] Vacuum-seal the sample after surface cleaning in a quartz glass tube, and the vacuum degree in the quartz tube during the sealing process is P=2×10 -3 Pa, to ensure that no reactions such as oxidation and hydrogen absorption occur on the surface of the sample during the subsequent high-temperature heat treatment.

[0035] The vacuum-sealed sample was placed in a box-type heat treatment furnace heated to...

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Abstract

The invention provides a method for weakening zirconium alloy plate texture through phase-change treatment. The method for weakening the zirconium alloy plate texture through phase-change treatment comprises the following steps that after the surface of a zirconium alloy plate sample is cleaned, vacuum sealing treatment is conducted through a quartz tube under the condition that the vacuum degree P is lower than 5*10<2> Pa; two-phase regional heat treatment for annealing is conducted on the zirconium alloy plate sample sealed through the tube, the annealing temperature is 820-980 DEG C, and the heat preservation time is 10-500 min; after heat treatment and heat preservation, the quartz tube is clamped to be broken rapidly, the zirconium alloy plate sample is rapidly quenched in cooling media with good heat conductivity, so that a high cooling rate (higher than 100 DEG C / s) is obtained. By adoption of the method for weakening zirconium alloy plate texture through phase-change treatment, the projection of the surface of the double-peak strong crystal texture with a typical base surface is centralized to the position near the normal of a plate, the texture structure of the zirconium alloy plate which transversely deflects by about 25-40 degrees is obviously reduced after being treated through the heat treatment rule, the grain preferred orientation is obviously weakened, the anisotropy of the zirconium alloy plate can be reduced easily, and thus the usability of the zirconium alloy plate is improved.

Description

technical field [0001] The invention relates to a method for weakening the texture of zirconium alloy plates through phase change treatment. The method requires a specific heat treatment process for zirconium alloy samples, so that the relatively stable crystal texture characteristics of the zirconium alloy can be significantly changed, thereby improving the use performance , belongs to the technical field of zirconium alloy processing. Background technique [0002] Zirconium alloys have low thermal neutron absorption cross-section, excellent corrosion resistance and good comprehensive mechanical properties. They have long been used as fuel cladding tubes for nuclear reactors and are still one of the irreplaceable main structural materials in nuclear reactors. Commercial zirconium alloys are dominated by the α-phase of the hexagonal close-packed (hcp) structure in most processing procedures and operating conditions. Due to the low crystal symmetry and few independent slip s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22F1/18C22F1/02C23G1/10
CPCC22F1/02C22F1/186C23G1/025C23G1/106
Inventor 柴林江陈可王婷婷夏吉莺吴昊
Owner CHONGQING UNIV OF TECH
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