Investigation into the effects of laser shock peening as a post treatment to laser impact welding

Sadeh, Sepehr; Malik, Arif

doi:10.1016/j.matdes.2021.109701

Cited by 19 publications

(3 citation statements)

References 54 publications

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“…Laser peening is a technology that 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 [ 8 ]. When laser peening is performed, plasma is concentrated on the surface using a transparent overlay (water [ 9 ] or glass [ 10 ] layer), and absorption layers (Al [ 11 , 12 ], vinyl tape [ 13 , 14 ]) are used to form effective compressive residual stress. When laser peening is performed by positioning an absorption layer that maintains the high quality of the surface and effectively maintains surface melting and energy conversion, compressive residual stress is formed [ 15 ] and grain refinement occurs [ 16 ], which leads to microstructural changes due to increasing dislocation density and strain [ 17 ].…”

Section: Introductionmentioning

confidence: 99%

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: Introductionmentioning

confidence: 99%

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

2023

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“…Laser peening is the cold forming process used to treat the surface, and compressive residual stress can be achieved by the shock wave due to the expansion of high-pressure plasma. In the laser peening process, a focused, high-energy, and short-pulsed laser beam irradiates the surface of a metal specimen, which is usually covered with a thin layer of overlay water [ 27 ], glass [ 28 ], paint [ 29 ], aluminum foil [ 30 , 31 ], or tape [ 32 , 33 ] for protection against melting [ 28 ].…”

Section: Introductionmentioning

confidence: 99%

“…The laser-induced compressive residual stress field has various beneficial effects on the microstructure and mechanical and electrochemical properties of the peened metals. Microstructural changes such as dynamic recrystallization and grain refinement help in improving mechanical performance [ 28 , 34 , 35 ]. The increased dislocation density due to grain refinement has been demonstrated to increase the hardness [ 36 , 37 , 38 , 39 ].…”

Section: Introductionmentioning

confidence: 99%

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

Yoo

Kim

2022

Materials

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The introduction of tensile residual stress has led to the induction of damage such as fatigue, corrosion fatigue, and stress corrosion cracking (SCC) in stainless steel in association with the influence of environments, components, surface defects, and corrosive factors during its use. Compressive residual stress can be achieved through various techniques. Among several methods, laser peening can be more attractive as it creates regularity on the surface with a high-quality surface finish. However, there is very little research on heavily peened surface and cross-section of stainless steel with very deep compressive residual stress. This work focused on welding and laser peening and the influence of Al coating on the microstructural changes in 304L stainless steel. The specimen obtained by laser peening had a very deep compressive residual stress of over 1 mm and was evaluated based on microstructural and hardness analysis. Therefore, a model for microstructural change by laser peening on welded 304L stainless steel was proposed.

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Improvement of Laser Shock Peening Depth Through Regulation of Surface Optical Absorption

Yan

Zhu

et al. 2021

Adv Materials Inter

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Higher depths at the millimeter scale (1-2 mm), along with greater magnitudes, have been reported after the NLSP of Ti6Al4V titanium alloy, [2,10] 2024, [11] 6061, [12] and 7075 [13] aluminum alloys. Elaborated laser systems with large power densities are currently required to increase the peak pressure to enable a high input of energy (slightly over 10 GW cm -2 ) during the interaction between the incident laser and metals. [14] The critical power density threshold for the confinement layer breakdown is validated to limit the possible peak pressure. [15][16][17] Changing the wavelength of the incident laser from 1064 to 532 nm decreases the breakdown threshold of the confining water layers from 10 to 6 GW cm -2 , and the maximum peak pressure from ≈5.5 to 4.5 GPa. [18,19] Compressive residual stresses can also be generated deep below the peened surface by multiple or overlapping laser pulses. [20,21] The reduced attenuation of the shock wave indicates an increased depth for the plastic-deformed layer during subsequent peening, while the affected depths usually reach saturated border values within three to five impacts. [22,23] Additionally, femtosecond laser shock peening is applied to induce a shallower affected depth and a limited compressive layer owing to the high instantaneous power density. [24] It is necessary to increase the surface optical absorption and associated energy conversion at higher affected depths in NLSP. The surface optical absorption property determines the thermal energy fraction, [25,26] with a value of ≈0.2 utilized in investigations. [27,28] In this case, optical absorption is defined by the surface morphology of the metal rather than its intrinsic absorptance. [29] Various absorption mechanisms with different optical behaviors are found in the structures induced using lithographic and chemical techniques. [30,31] These essentially originate from selective absorption responses such as the surface plasmon resonance, magnetic-polariton, geometric optical response, and metamaterial resonances. [29,[32][33][34] A nanoscale structure and laser-induced periodic surface structure can enhance the absorption of laser energy by the reconstruction of surface electromagnetic distributions. [35] The absorption of light is enhanced on structured surfaces by multiple reflections based on the angular dependence of Fresnel absorption. [35] The absorption spectrum of femtosecond laser treated surfaces increased sharply over a wide range of wavelengths of incident Laser shock peening is conducted to enhance the mechanical properties of metals. Efficient optical absorption of metal surface is desirable to increase the laser shock peening depth. In this work, a method is proposed to regulate the absorption behavior by surface colorizing to increase the affected depth and magnitude of nanosecond laser shock peening (NLSP). Colorized samples are fabricated with high absorption of 400-1500 nm, which is 89% higher than that of un-colorized samples. This regulated optical response is attributed to the multi-ref...

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Investigation into the effects of laser shock peening as a post treatment to laser impact welding

Cited by 19 publications

References 54 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 Laser Peening on Microstructural Changes in GTA-Welded 304L Stainless Steel

Improvement of Laser Shock Peening Depth Through Regulation of Surface Optical Absorption

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