Effect of Laser Peening on the Corrosion Properties of 304L Stainless Steel

Dry canisters used in nuclear power plants can be subject to localized corrosion, including stress corrosion cracking. External and residual tensile stress can facilitate the occurrence of stress corrosion cracking. Residual stress can arise from welding and plastic deformation. Mitigation methods o...

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Bibliographic Details
Published inMaterials Vol. 16; no. 2; p. 804
Main Authors Yoo, Young-Ran, Choi, Seung-Heon, Kim, Young-Sik
Format Journal Article
LanguageEnglish
Published Switzerland MDPI AG 13.01.2023
MDPI
Subjects
Alloys
Aluminum
Aluminum alloys
Austenitic stainless steels
Compressive properties
Corrosion effects
Corrosion potential
Corrosion rate
Corrosion resistance
cross-section
Electrodes
Intergranular corrosion
Laser beam welding
laser peening
Laser shock processing
Lasers
Localized corrosion
Metals
Nanocrystals
Nuclear power plants
passivation
Plastic deformation
Residual stress
Stainless steel
Stress corrosion cracking
Stress measurement
Tensile stress
Water jet peening
United States > US
cross-section
intergranular corrosion
passivation
stainless steel
laser peening
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Summary:Dry canisters used in nuclear power plants can be subject to localized corrosion, including stress corrosion cracking. External and residual tensile stress can facilitate the occurrence of stress corrosion cracking. Residual stress can arise from welding and plastic deformation. Mitigation methods of residual stress depend upon the energy used and include laser peening, ultrasonic peening, ultrasonic nanocrystal surface modification, shot peening, or water jet peening. Among these, laser peening technology irradiates a continuous laser beam on the surface of metals and alloys at short intervals to add compressive residual stress as a shock wave is caused. This research studied the effect of laser peening with/without a thin aluminum layer on the corrosion properties of welded 304L stainless steel. The intergranular corrosion rate of the laser-peened specimen was a little faster than the rate of the non-peened specimen. However, laser peening enhanced the polarization properties of the cross-section of 304L stainless steel, while the properties of the surface were reduced by laser peening. This behavior was discussed on the basis of the microstructure and residual stress.
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ISSN:1996-1944
1996-1944
DOI:10.3390/ma16020804