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Surface treatment method for improving radiation resistance and corrosion resistance of 316LN austenitic stainless steel

A technology for surface treatment of austenitic stainless steel, applied in weather resistance/light resistance/corrosion resistance, instruments, analytical materials, etc., can solve toughness, plasticity, ductility decline, deterioration of material mechanical properties, stress corrosion cracking and other problems, Achieve the effect of improving radiation resistance and corrosion resistance, low price and wide application range

Active Publication Date: 2018-08-07
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The radiation swelling of 316LN austenitic stainless steel will seriously deteriorate the mechanical properties of the material, resulting in a decrease in toughness, plasticity and ductility
What's more, radiation can also promote stress corrosion cracking, and many vicious cases of radiation-promoted stress corrosion cracking have been reported internationally.

Method used

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  • Surface treatment method for improving radiation resistance and corrosion resistance of 316LN austenitic stainless steel
  • Surface treatment method for improving radiation resistance and corrosion resistance of 316LN austenitic stainless steel

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] The 316LN austenitic stainless steel was cut into 60mm×60mm×5mm plates for solution treatment at a temperature of 1050°C, kept for 90 minutes, quenched, and polished until the surface roughness was less than 0.1μm. Select GCr15 steel balls with a diameter of 0.4mm, put the plate into the shot peening equipment for surface shot peening, the shot peening time is 5 minutes, the shot peening speed is 70 m / s, and the average grain size is 45nm, martensite A sample with a phase volume fraction of about 8%. Electrolytic polishing was carried out on the sample, the polishing solution was a perchloric acid alcohol solution with a volume fraction of 20%, the polishing voltage was 30V, and the polishing time was 60 seconds. The polished sample was subjected to passivation treatment, the passivation solution was a nitric acid aqueous solution with a volume fraction of 60%, the passivation temperature was 30° C., and the passivation time was 6 hours. The 316LN austenitic stainless ...

Embodiment 2

[0023] The 316LN austenitic stainless steel was cut into 60mm×60mm×5mm plates for solution treatment at a temperature of 1050°C, kept for 90 minutes, quenched, and polished until the surface roughness was less than 0.1μm. Select a GCr15 steel ball with a diameter of 0.2mm, put the plate into the shot peening equipment for surface shot peening, the shot peening time is 15 minutes, and the shot peening speed is 40 m / s to obtain an average grain size of 40nm, martensite A sample with a phase volume fraction of about 12%. Electrolytic polishing was carried out on the sample, the polishing solution was a perchloric acid alcohol solution with a volume fraction of 20%, the polishing voltage was 30V, and the polishing time was 60 seconds. The polished sample was subjected to passivation treatment, the passivation solution was a nitric acid aqueous solution with a volume fraction of 30%, the passivation temperature was 30° C., and the passivation time was 8 hours. The 316LN austenitic...

Embodiment 3

[0025] The 316LN austenitic stainless steel was cut into 60mm×60mm×5mm plates for solution treatment at a temperature of 1050°C, kept for 90 minutes, quenched, and polished until the surface roughness was less than 0.1μm. Select GCr15 steel balls with a diameter of 1.0mm, put the plate into the shot peening equipment for surface shot peening, the shot peening time is 30 minutes, the shot peening speed is 90 m / s, and the average grain size is 18nm, martensite A sample with a phase volume fraction content of about 75%. Electrolytic polishing was carried out on the sample, the polishing solution was a perchloric acid alcohol solution with a volume fraction of 20%, the polishing voltage was 30V, and the polishing time was 60 seconds. The polished sample was subjected to passivation treatment, the passivation solution was a nitric acid aqueous solution with a volume fraction of 45%, the passivation temperature was 30° C., and the passivation time was 3 hours. The 316LN austenitic ...

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Abstract

The invention discloses a surface treatment method for improving the radiation resistance and the corrosion resistance of 316LN austenitic stainless steel, and belongs to the field of nuclear power key structural materials. The method is characterized in that the surface of the 316LN austenitic stainless steel is modified by utilizing a shot blasting technology and a passivation treatment technology, a martensite phase which appears in the shot blasting process is effectively controlled (namely, the deformation induced ferrite transformation process is controlled), the twin boundaries are increased, grains are refined, meanwhile, the stainless steel is subjected to passivation treatment, so that a passivation film on the surface of the stainless steel can be more uniform, more compact andstronger in binding force, and the purposes of simultaneously improving the radiation resistance and the corrosion resistance of the 316LN austenitic stainless steel can be achieved. Treatment equipment has the advantages of being simple, low in cost and wide in application range.

Description

technical field [0001] The invention belongs to the field of nuclear power key structural materials and relates to a surface treatment method for improving the radiation resistance and corrosion resistance of 316LN austenitic stainless steel. Background technique [0002] Nuclear energy is recognized as a realistic, clean and economical energy that can replace fossil energy on a large scale. The key structural materials of future nuclear power plants need to withstand higher temperature and pressure as well as stronger radiation and chemical corrosion. 316LN is an ultra-low carbon nitrogen controlled austenitic stainless steel. Due to the addition of N elements, 316LN stainless steel has significantly improved strength while retaining good plasticity and toughness. It is used as the main pipe material of the primary circuit of the AP1000 third-generation pressurized water reactor nuclear power plant, the main structural material of the fourth-generation fuel fast reactor an...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C22/50C23C22/78C21D7/06G01N17/02
CPCC21D7/06C23C22/50C23C22/78G01N17/02
Inventor 杨滨陈旭东朱运田李玉胜
Owner UNIV OF SCI & TECH BEIJING
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