Laser Peening Application for PWR Power Plants

김, 종도; 유지, 사노

doi:10.5781/jwj.2016.34.5.13

Cited by 2 publications

(1 citation statement)

References 2 publications

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“…However, the LSP process is mainly applied to high-added-value products because of the high process cost compared to other peening processes [4]. For example, mechanical parts subjected to fatigue loads, such as turbine blades, or subjected to corrosive environments, such as welded parts in nuclear reactors, are the main applications for LSP [5].…”

Section: Introductionmentioning

confidence: 99%

FE Analysis of Laser Shock Peening on STS304 and the Effect of Static Damping on the Solution

Kim

Suh

Shin

et al. 2021

Metals

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Laser shock peening creates compressive residual stress on the surface of the material, reducing stress corrosion cracking and increasing fatigue life. FE simulation of laser shock peening is an effective way to determine the mechanical effects on the material. In conventional FE simulations of laser shock peening, explicit analysis is used while pressure loads are applied and switched into implicit analysis to dissipate kinetic energy. In this study, static damping was adopted to dissipate kinetic energy without conversion into implicit analysis. Simulation of a single laser shock and multiple shocks was performed, and deformation and minimum principal stress were compared to evaluate the static damping effect. The history of the internal and kinetic energy were analyzed to compare the stabilization time depending on the damping value. Laser shock peening experiments were also performed on stainless steel 304 material. The residual stress of the specimen was measured by the hole drilling method and it was compared to the FE simulation result. The residual stress from the experiment and the simulation results showed similar distributions in the depth direction. Anisotropic residual stress distribution due to the laser path was observed in both results.

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Section: Introductionmentioning

confidence: 99%

FE Analysis of Laser Shock Peening on STS304 and the Effect of Static Damping on the Solution

Kim

Suh

Shin

et al. 2021

Metals

View full text Add to dashboard Cite

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Effect of Laser Shock Peening on the Stress Corrosion Cracking of 304L Stainless Steel

Yoo

Choi

Kim

2023

Metals

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Storage canisters used in nuclear power plants operating in seaside areas—where the salt content in the atmosphere is high—may be susceptible to chloride-induced stress corrosion cracking (CISCC). Chloride-induced stress corrosion cracking is one of the ways in which dry storage canisters made of stainless steel can degrade. Stress corrosion cracking depends on the microstructure and residual stress, and it is therefore very important to improve the surface properties of materials. Laser shock peening both greatly deforms the material surface and refines grains, and it generates compressive residual stress in the deep part from the surface of the material. This study focused on the effect of laser shock peening on the stress corrosion cracking of 304L stainless steel. The laser shock peening was found to induce compressive residual stress from the surface to a 1 mm depth, and the SCC properties were evaluated by a U-bend test. The results showed that the SCC resistance of laser-peened 304L stainless steel in a chloride environment was enhanced, and that it was closely related to grain size, the pitting potential of the cross section, and residual stress.

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Laser Peening Application for PWR Power Plants

Cited by 2 publications

References 2 publications

FE Analysis of Laser Shock Peening on STS304 and the Effect of Static Damping on the Solution

FE Analysis of Laser Shock Peening on STS304 and the Effect of Static Damping on the Solution

Effect of Laser Shock Peening on the Stress Corrosion Cracking of 304L Stainless Steel

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