Gradient Microstructure in Laser Shock Peened Materials

Zhou, Liucheng; He, Weifeng

doi:10.1007/978-981-16-1747-8

Cited by 7 publications

(18 citation statements)

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“…The shock between the ejected molecules and the ambient gas results in the formation of a shock wave. Conversely, while the ablated surface released an intermittently strong shock wave, it also formed a rarefaction wave converging toward the ablation center 3,22 as depicted in the third stage of Figure 3. The last phenomenon causes the re‐deposition of the slow particulate ablation products on the substrate (molecules fragments of the matrix) where condensation occurs, while the fate of most of the lightest ablation products depends on the gas flow outside the irradiated substrate 23 .…”

Section: Resultsmentioning

confidence: 99%

“…The longitudinal wave is the fastest and the main wave. These waves could induce a strong impact leading to the microcracks, or elastic impact, and elastic–plastic impact, ripples formation, and the expulsion of the molten material 22 …”

Section: Resultsmentioning

confidence: 99%

“…These waves could induce a strong impact leading to the microcracks, or elastic impact, and elastic-plastic impact, ripples formation, and the expulsion of the molten material. 22 To systematically investigate ablation kinetic and ablation threshold behaviors as a function of CB content, Figure 4 shows a comparison of the AD per pulse. It corresponds to the slope of the linear part of graph presented in Figure 2.…”

Section: Probing Pulse Ablationmentioning

confidence: 99%

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Laser processing of carbon black reinforced ethylene‐butyl acrylate copolymer

Aboudi

Bouyahia

et al. 2023

J of Applied Polymer Sci

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Interest in the phenomenon of laser ablation (LA) has gained significant attention in recent years due to its potential for machining, high‐precision drilling, and cutting materials, such as metals, semiconductors, and dielectrics. Here, LA of ethylene‐butyl acrylate (EBA) filled with different volume fractions (4%, 8%, and 20%) of CB particles is studied. Upon irradiation with the second harmonics (532 nm) of the nanosecond pulsed Nd:YAG laser, a structuration is evidenced at the sample surface in a restricted range of fluence and at high pulse number (PN) (500 pulses, 1 Hz). The laser‐ablated surface is analyzed by microtopography, scanning electron microscopy (SEM), and x‐ray photoelectron spectroscopy (XPS). Collectively, our data show a lowering in ablation threshold and depth for CB volume fractions larger than the conduction threshold (8%), indicating that visible radiation primarily induces photothermal effects. After redeposition of the ablation products at the surface, XPS indicates that high CB content in the EBA matrix induces high oxidation level of the composite surface. Furthermore, our results reveal that LA produces a significant proportion of amorphous carbon. Several parameters which affect heat accumulation and CB particle shielding are discussed. Such parameters include laser fluence and repetition rate, and CB content.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Probing Pulse Ablationmentioning

confidence: 99%

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Laser processing of carbon black reinforced ethylene‐butyl acrylate copolymer

Aboudi

Bouyahia

et al. 2023

J of Applied Polymer Sci

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“…The confining medium prevents the plasma from expanding away from the surface, generating shock waves. These shock waves are plastically deforming surfaces, and compressive residual stresses are imparted into the subsurface [18][19][20]. In waterconfined mode, which was used in the experiment, plasma pressure is given by the formula [16]:…”

Section: Resultsmentioning

confidence: 99%

“…where I 0 is the incident laser power density, α is the fraction of the total plasma internal energy used as thermal energy, and Z is a reduced acoustic impedance given by [16,18]:…”

Section: Resultsmentioning

confidence: 99%

Microstructure and surface quality of SLM printed miniature helical gear in LSPwC

Pathak

Böhm

Kaufman

et al. 2023

Surface Engineering

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The present work describes the influence of underwater laser shock peening without coating (LSPwC) on selective laser melting manufactured meso-size (outside diameter ≤ 10 mm) helical gears. Five experiments were conducted using energies in the 200 mJ up to 1 J, while the spot size and overlap were kept constant as 1 mm and 90 %, respectively. Responses were measured and compared in terms of surface residual stresses, surface roughness, and microstructure of LSPwC-treated samples. Results show the development of significant compressive residual stresses in the root of the LSPwC processed helical gear, where it changes the state from tensile +45 MPa to compressive −421 MPa. Surface roughness has shown improvement, while volumetric material peak confirms the reduction by over 50%. Microstructure study was performed at the surface and by cross-section using scanning electron microscopy and electron backscatter diffraction analysis. The grain refinement and change in misorientation were observed, confirming plastic deformation.

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Improvement of microstructure and performance of an extreme-high-speed laser cladding CoCrFeMnNi coating through laser shock peening

Du,

Deng,

et al. 2024

Journal of Alloys and Compounds

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Gradient Microstructure in Laser Shock Peened Materials

Cited by 7 publications

References 0 publications

Laser processing of carbon black reinforced ethylene‐butyl acrylate copolymer

Laser processing of carbon black reinforced ethylene‐butyl acrylate copolymer

Microstructure and surface quality of SLM printed miniature helical gear in LSPwC

Improvement of microstructure and performance of an extreme-high-speed laser cladding CoCrFeMnNi coating through laser shock peening

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