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Method for improving anti-irradiation properties of low activation material by using ion pre-irradiation

A low-activation, pre-irradiation technology, applied in the field of structural steel materials, can solve the problems of complex and uneconomical processes, and achieve the effects of simple process, easy operation, stable size and structure

Inactive Publication Date: 2014-05-14
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, this method is very complicated and uneconomical, and the material processed in this way puts forward high requirements for subsequent material processing

Method used

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  • Method for improving anti-irradiation properties of low activation material by using ion pre-irradiation

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] 1) The low activation steel model alloy (Fe-10wt%Cr) was mechanically thinned to 100 um, polished and cleaned with acetone.

[0019] 2) Load the sample on the ion accelerator target, close it, and pump the vacuum of the accelerator to 1×10 -6 Pa.

[0020] 3) The implanted ions are D ions, the energy is 58 keV, and the dose is 1×10 17 ions / cm 2 . The temperature was set at 500 °C. The irradiation time is about 10 hours.

[0021] 4) After the pre-irradiation is completed, a large number of nanoscale precipitates are produced in the alloy, and the size distribution is between 30 and 200 nanometers, as shown in the electron microscope image above. The precipitates remained dimensional and structurally stable during subsequent irradiation.

[0022]

Embodiment 2

[0024] 1) Low activation steel (Fe-9Cr-2W-V-Ta-C-Mn) was mechanically thinned to 100 um, polished and cleaned with acetone.

[0025] 2) Load the sample on the ion accelerator target, close it, and pump the vacuum of the accelerator to 1×10 -6 Pa.

[0026] 3) The implanted ions are H ions, the energy is 100 keV, and the dose is 1.6×10 17 ions / cm 2 . The temperature was set at 500 °C. The irradiation time is about 16 hours (6-24 hours).

[0027] 4) After the pre-irradiation is completed, a large number of nanoscale precipitates are produced in the alloy, and the size distribution is between 30 and 200 nanometers. The precipitates remained dimensional and structurally stable during subsequent irradiation.

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Abstract

The invention proposes a novel method for generating a nano educt by using ion pre-irradiation, so as to improve the anti-irradiation properties of a material. The method comprises the following steps: carrying out proper pre-irradiation on low activation ferritic / martensitic steel or low activation model alloy; and forming a nanophase in the material. The stable size and structure of the nano precipitate can be kept in subsequent irradiation, and more point defect traps are provided for the material. Thus, the anti-irradiation properties of the low activation material are improved.

Description

[0001] technical field [0002] The invention belongs to the technical field of structural steel materials, and relates to a method for improving the radiation resistance of structural steel for reactors. Background technique [0003] The rational development and utilization of nuclear energy is one of the important ways to solve the increasingly serious energy problems of human beings, and has been widely concerned and studied all the time. Due to the extremely harsh radiation environment faced by nuclear reactor structural materials, it is particularly important to improve the radiation resistance of materials. Interfaces (grain and phase boundaries) in materials can act as efficient traps (sinks) for irradiation-generated point defects (interstitial atoms and vacancies) [X.M. Bai, et al. Science,2010,327:1631-3633. and G.X. Science, 2010], which makes the vacancies and interstitial atoms near the interface recombine effectively, so that the material has good self-healing...

Claims

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Application Information

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IPC IPC(8): C21D10/00C22C38/26
Inventor 刘平平詹倩万发荣赵明忠
Owner UNIV OF SCI & TECH BEIJING
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