Effect of Laser Peening on Microstructural Changes in GTA-Welded 304L Stainless Steel

Yoo, Young-Ran; Kim, Jae-Sung; Kim, Young-Sik

doi:10.3390/ma15113947

Cited by 3 publications

(8 citation statements)

References 40 publications

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“…When the laser peening was forced to the surface, the grain size of the outermost area was refined, and this refinement yielded a partly smaller grain size for the observed area. Note that the refinement of the outermost area needed to be much more intensive than that of the observed area [ 18 ]. In addition, the average grain size of the HAZ area was greater than the size of the base metal due to the grain growth of the HAZ area by welding.…”

Section: Resultsmentioning

confidence: 99%

“…The specimen used in this work was commercial 304L stainless steel; Table 1 shows the chemical composition of 304L stainless steel and its filler metal [ 18 ]. The thickness of the specimen was 25 mm.…”

Section: Experimental Methodsmentioning

confidence: 99%

“…The thickness of the specimen was 25 mm. The specimen was welded using the gas tungsten arc welding (GTAW) method by the following conditions (see Table 2 ) [ 18 ]. Table 3 shows the designation of the specimen’s condition [ 18 ].…”

Section: Experimental Methodsmentioning

confidence: 99%

“…The laser peening process employed in this study was well described elsewhere: Figure 1 shows the schematic diagram of laser peening and Table 4 summarizes the laser peening conditions [ 18 ]. The equipment for laser peening was self-manufactured using an Nd-YAG laser to protect the steel’s surface during the laser peening process and Al tape was used.…”

Section: Experimental Methodsmentioning

confidence: 99%

“…This influences intergranular corrosion, corrosion fatigue, and SCC properties. We recently reported the effect of laser peening on the microstructure of 304L stainless steel: Laser peening resulted in the increased roughness of the surface, refinement of the grain size, deformation of the inside, increased dislocation density, and increased hardness of 304L stainless steel [ 18 ].…”

Section: Introductionmentioning

confidence: 99%

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

2023

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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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Section: Resultsmentioning

confidence: 99%

Section: Experimental Methodsmentioning

confidence: 99%

Section: Experimental Methodsmentioning

confidence: 99%

Section: Experimental Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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

2023

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Effect of Ultrasonic Shot Peening on Microstructure and Corrosion Properties of GTA-Welded 304L Stainless Steel

Cho,

Yoo,

Kim

2024

Crystals

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Austenitic stainless steels used in structural applications suffer from stress corrosion cracking due to residual stresses during welding. Much research is being conducted to prevent the stress corrosion cracking of austenitic steels by inducing compressive residual stresses. One method is ultrasonic shot peening (USP), which is used to apply compressive stress by modifying the mechanical properties of the material’s surface. In this study, 304L stainless steel was butt-welded by gas tungsten arc welding (GTAW) and subsequently subjected to compressive residual stress to a depth of 1 mm from the surface by a USP treatment. The influence of USP on microstructural changes in the base metal, the HAZ and weldment, and the corrosion properties was analyzed. A microstructural analysis was conducted using SEM-EDS, XRD, and EBSD methods alongside residual stress measurements. The surface and cross-sectional corrosion behavior was evaluated and analyzed using a potentiodynamic polarization test, electrochemical impedance spectroscopy (EIS) measurements, a double-loop electrochemical potentiokinetic reactivation (DL-EPR) test, and an ASTM A262 Pr. C test. The surface was deformed and roughened by the USP. The deformed areas formed crevices, and the inside of the crevices contained some cracks. The crevices and internal cracks caused pitting, which reduced the resistance of the passivation film. The cross-section was subjected to compressive residual stress to a depth of 1 mm from the surface, and the outermost area of the cross-section had fine grain refinement, forming a solid passivation film that improved the corrosion resistance.

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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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Effect of Laser Peening on Microstructural Changes in GTA-Welded 304L Stainless Steel

Cited by 3 publications

References 40 publications

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

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

Effect of Ultrasonic Shot Peening on Microstructure and Corrosion Properties of GTA-Welded 304L Stainless Steel

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

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