Laser Shock Peening Research Articles

Study on the spallation behavior of FeCoCrNiCu high-entropy alloy under laser shock peening at cryogenic temperature

Study on the spallation behavior of FeCoCrNiCu high-entropy alloy under laser shock peening at cryogenic temperature

Influence of laser shock peening on the fretting wear behaviour of CuNiIn coating

Influence of laser shock peening on the fretting wear behaviour of CuNiIn coating

Deposition stability and enhanced microhardness of laser shock peened of Ti6Al4V alloy manufactured by high layer thickness laser additive manufacturing

Deposition stability and enhanced microhardness of laser shock peened of Ti6Al4V alloy manufactured by high layer thickness laser additive manufacturing

Effects of laser shock peening on the microstructure and mechanical properties of coatings by laser remelting

Effects of laser shock peening on the microstructure and mechanical properties of coatings by laser remelting

Effect of laser shock peening on abrasion and corrosion resistance of Zr-4 alloy

Effect of laser shock peening on abrasion and corrosion resistance of Zr-4 alloy

Effect of laser shock peening overlap rate on microstructure and wear resistance of M50 steel

Effect of laser shock peening overlap rate on microstructure and wear resistance of M50 steel

Synergistic enhancement of strength and plasticity for laser direct energy deposited Ti60 joint by locally applied laser shock peening

Synergistic enhancement of strength and plasticity for laser direct energy deposited Ti60 joint by locally applied laser shock peening

Prediction of residual stress in superalloys by low energy laser shock peening based on inherent strain theory and finite element method

Prediction of residual stress in superalloys by low energy laser shock peening based on inherent strain theory and finite element method

Analysis of laser shock peening parameters on the surface integrity of WC-Co cemented carbide

Former explorations have revealed that laser shock peening can enhance the integrity of the carbide surface. This study aims to examine the effect of laser shock parameters on WC-Co cemented carbide surface integrity and a comparative analysis of carbide protrusion. An experimental design is conducted to quantify the impact of relevant process parameters. Surface roughness and residual stress have been employed to assess the surface integrity parameters. Additionally, the TOPSIS entropy weight approach has been utilized to analyze the comprehensive evaluation of the surface integrity by the coupling effect of multiple laser parameters. The results indicate that the laser parameters substantially affect the surface quality and are the determining factor of the laser power density. The constrained layer protects the carbide surface well and gives it better surface integrity. The laser power density directly influences the thermal effect of the material, making the WC particles progressively more prominent and increasing the surface roughness. At the same time, the surface roughness and residual stresses coupled with multiple parameters are analyzed using the TOPSIS entropy weight approach. The results highlight that the relatively best WC-Co carbide strengthening effect is achieved during laser processing, with laser power density of 3.98 J/cm2, scanning speed of 400 mm/s, and impact number of 2 times.

Experiments and Multiscale Simulation on Enhancement Mechanism of Zirconium Alloy Microstructure and Properties by Laser Shock Peening

Zirconium alloys are critical materials in nuclear engineering due to their exceptional irradiation resistance and corrosion stability. However, prolonged exposure to extreme operational environments, including a high radiation, mechanical stress, and corrosive media, induces surface degradation mechanisms including stress corrosion cracking and erosion from impurity particle impacts, necessitating advanced surface treatments to improve hardness and corrosion resistance. We explore the application of laser shock peening (LSP) to enhance the surface properties of the Zr4 alloy. Experimental analyses reveal substantial microstructural modifications upon the LSP. The surface grain refinement achieved a maximum reduction of 52.7% in average grain size (from 22.88 to 10.8 μm2), accompanied by an increase of 59% in hardness (204 to 326 HV). Additionally, a compressive residual stress layer (approximately –100 MPa) was generated on the treated surface, which reduces the risk of stress corrosion cracking. To elucidate the mechanistic basis of these improvements, a multiscale computational framework was developed, integrating finite-element models for macroscale stress field evolution and molecular dynamics simulations for nanoscale dislocation dynamics. By incorporating the strain rate as a critical variable, this framework bridges microstructure evolution with macroscopic mechanical enhancements. The simulations not only elucidated the dynamic interplay between shockwave-induced plastic deformation and property improvements but also exhibited a good consistency with experimental residual stress profiles. Notably, we propose the application of strain rate-driven multiscale modeling in LSP research for Zr alloys, providing a predictive method to optimize laser parameters for a tailored surface strengthening. This study not only confirms that LSP is a feasible strategy capable of effectively enhancing the comprehensive surface properties of Zr alloys and extending their service life in nuclear environments, but also provides a reliable simulation methodology in the field of laser surface engineering of alloy materials.

A neutron dark-field imaging study towards guiding magnetic flux in electric steel sheets through laser shock peening

Well-designed guidance of the magnetic field through electric steel sheets forming the rotor of electrical motors and generators is of utmost importance with regards to efficiency. Typically, this is achieved through tailored cutouts in the sheets. While fulfilling the magnetic guidance needs this strategy structurally weakens the rotor and ultimately limits the possible rotation speeds due to the mechanical forces these imply. Recently an alternative approach has been reported, in which the material is embossed in respective regions. The, thus, induced stresses act, based on the inverse magnetostrictive effect, as flux barriers without, unlike traditional cutouts, weakening the structure significantly. Here we propose to replace the embossing through laser shock peening, which can be controlled digitally and hence be applied flexibly, without the need for mechanical changes in the production lines, like in the case of a punch.

Influence of laser shock peening on the tribological behavior of additively manufactured SS316L

Influence of laser shock peening on the tribological behavior of additively manufactured SS316L

Molecular dynamics simulation of the effect of shock velocity on microstructure and mechanical properties of laser shock peening of polycrystalline γ-TiAl

Abstract The molecular dynamics method and piston impact method are employed to study laser shock peening(LSP) of polycrystalline γ-TiAl alloys at various shock velocities. The purpose of this paper is to reveal the dynamic evolution mechanism of shock wave propagation characteristics and microstructure of γ-TiAl alloy during LSP, and to elucidate the effect laws of different shock velocities on dislocation motion, phase transformation and defect evolution. Results show that, during the loading stage, atomic velocity is affected by elastoplastic segregation, and the shear stress is influenced by grain boundaries and dislocations, with plastic deformation primarily expanding inward from grain boundaries. During the holding stage, phase transformation from γ to α2 occurred at 0.5 km/s and 0.8 km/s, both exhibiting deformation twins. At 0.8 km/s, dislocations concentrated at grain boundaries; in other modes, they were more distributed in stacking faults. During the unloading stage, dislocations stabilized after elastic recovery. Post-laser shock peening, polycrystalline γ-TiAl displayed small equiaxed grains, twins, and γ/α2 lamellar structures with improved tensile properties and hardness—indicating significant potential for enhancing γ-TiAl alloy properties through this technology. This study provides an atomic-scale basis for the dynamic evolution mechanism of the microstructure of γ-TiAl alloys strengthened by LSP, which breaks through the limitations of the experimental methods for the characterization of dynamic processes.

Fabrication of Mechanically Robust Hydrophobic Surfaces Using Femtosecond Laser Shock Peening.

The harsh service environment has increased the demand for hydrophobic surfaces with excellent mechanical properties; however, how to manufacture such surfaces remains a significant challenge. In this study, a method for fabricating hydrophobic surfaces with excellent mechanical properties using femtosecond laser shock peening (fs-LSP) is proposed, without the need for any additional processing steps. Taking CH1900A martensitic steel as an example, a systematic analysis of the microstructure was conducted after fs-LSP, revealing the mechanisms by which fs-LSP affects surface morphology, grain structure, dislocation density, and grain boundary characteristics. The high-density dislocations and grain refinement induced by fs-LSP significantly enhanced the surface hardness and introduced residual compressive stresses. Additionally, the laser-induced periodic micro/nanostructures on the surface ensured excellent hydrophobic properties. The effect of single pulse energy and the number of impacts on fs-LSP has also been discussed in detail. As the pulse energy and number of impacts were increased, the surface microstructure of the material was progressively optimized, evidenced by grain refinement, an increase in geometrically necessary dislocation (GND) density, and a higher proportion of high-angle grain boundaries (HAGBs). Such optimization is not monotonous or unlimited; a pulse energy of 75 μJ and six impacts achieved the optimal effect, with the surface hardness reaching up to 8.2 GPa and a contact angle of 135 degrees. The proposed fs-LSP provides a new strategy for manufacturing hydrophobic surfaces with excellent mechanical properties, and the detailed discussion and analysis also provide theoretical guidance for process optimization.

Influence of Gel-Type Confinement for Laser Shock Peening of a Ni-Based Alloy.

Laser shock peening (LSP) significantly enhances fatigue and corrosion resistance, especially in additively manufactured components. This effect is stronger when confinement is used; typically, it is water. However, water poses risks to sensitive electronics. As an alternative, this study explored gel-based confinement. A Ni-based alloy was LSP-treated using 532 nm and 1064 nm wavelengths, with three types of gel compared to water as a control. The results showed that gel confinement can induce compressive residual stresses and increase surface microhardness. However, gels were generally less effective than water in terms of residual stress magnitude and depth of hardening. Additionally, gel confinement required the use of a 1064 nm laser, whereas water confinement was more effective with 532 nm. Among the gels tested, one adhesive variant performed best due to improved surface contact and strong adhesion. The observed increase in microhardness and compressive stress was linked to surface grain refinement and twinning. Overall, adhesive gels offer potential benefits for LSP, particularly for additively manufactured parts, which often have high surface roughness and require non-conductive confinement solutions.

Enhance the microstructure and mechanical properties of directed energy deposition-Arc (DED-Arc) stainless steel 308L using laser shock peening process

Enhance the microstructure and mechanical properties of directed energy deposition-Arc (DED-Arc) stainless steel 308L using laser shock peening process

Improvement of low-cycle fatigue properties in electron beam powder bed fusion processed Ti-6Al-4V alloy by laser shock peening

Improvement of low-cycle fatigue properties in electron beam powder bed fusion processed Ti-6Al-4V alloy by laser shock peening

Superior fretting wear resistance of titanium alloys from stable gradient nanostructures induced by laser shock peening

Superior fretting wear resistance of titanium alloys from stable gradient nanostructures induced by laser shock peening

Incorporating machine learning in shot peening and laser peening: A review and beyond

Incorporating machine learning in shot peening and laser peening: A review and beyond

Enhancing cavitation erosion resistance of Ti6Al4V titanium alloy by dual-pulse laser shock peening

Enhancing cavitation erosion resistance of Ti6Al4V titanium alloy by dual-pulse laser shock peening