Customized laser beam intensity distribution for the laser surface treatment of geometrically convoluted components

Sancho, Paula; Cordovilla, Francisco; Domínguez, J. Lindner; Montealegre, M. A.; Isaza, Juan C.; Beltrán, Ángel García; Ocaña, J.L.

doi:10.1016/j.jmatprotec.2018.08.020

Cited by 10 publications

(1 citation statement)

References 14 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Customized laser beam shapes have been reported to influence the appearance of the treated area. [4][5][6] Integrated mirrors, modulators, diffractive optic elements (DOEs), and special beam shaping lenses are commonly applied for laser processing to improve process efficiency. [7][8][9][10] For instance, laser beams with higher intensity values at the edge are able to generate a homogenous treated area.…”

Section: Introductionmentioning

confidence: 99%

Impact of laser beam oscillation strategies on surface treatment of microalloyed steel

Dewi

Volpp

2020

Journal of Laser Applications

View full text Add to dashboard Cite

The depth homogeneity of laser-treated zones is one possible factor to define the quality and efficacy of altered mechanical properties in materials. For instance, half-rounded cross-sectional shapes of laser hardened zones using Gaussian beams provide dissimilar hardened depth in the edges and center of the treated area. This means that the in-depth distribution of compressive residual stress varies between the edges and the center of the hardened area. Nonhomogeneity of compressive residual stress distributions can inhibit fatigue properties and can lead to product failure. The utilization of oscillated laser beams has been proven to improve the welding efficiency and energy input distribution to the material, which promises achieving a homogeneous depth of laser-treated zones in hardening applications. Therefore, this work examines the influence of triangular, square, and circular beam oscillation strategies on the energy input distribution during the process and the geometry of the laser-treated zones on microalloyed steel. Laser beam pathways were assembled using a vector graphic editor to visualize the energy distribution from each oscillation strategy. Cross section images of the hardened tracks were taken and related to the thermal energy input profiles. It was revealed that each oscillation strategy demonstrates characteristic temporal and spatial thermal energy input distribution, influencing the geometry of the hardened zone. The circular oscillation strategy produced a widely constant depth in contrary to the triangular and square beam oscillation due to its characteristic energy distribution that allows homogeneous heat dissemination in the material. This confirms that the laser beam oscillation strategy can tailor the energy input distribution to optimize the processing outcome.

show abstract