Laser-induced thermal stresses on steel surface
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Significantly enhanced electrocatalytic activity of copper for hydrogen evolution reaction through femtosecond laser blackening
2021, International Journal of Hydrogen EnergyCitation Excerpt :However, comparatively, less attention has been paid to the contribution of Cu surface microstructure to its electrocatalytic activity towards HER. Laser processing is a viable technique for the creation of various microstructures to alter the optical [27], mechanical [28], and electrical [29] properties of materials such as aluminum [30], silicon [31], titanium [32], and gold [33] for a wide variety of applications in photonics, plasmonic and energy fields [34]. Compared to chemical etching and plasma ablating, femtosecond (fs) laser processing has higher accuracy, efficiency, controllability as well as repeatability, and can introduce microstructures on materials with higher physical stability.
Analytical mechanics modeling of in-process thermal stress distribution in metal additive manufacturing
2020, Journal of Manufacturing ProcessesCitation Excerpt :Yilbas et al. investigated the thermal stress in the laser heating of the sheet metal numerically. They concluded that the scan speed has a substantial influence on the temperature distribution and thermal stress [9]. Most of the works on the prediction of thermal stress analysis are using finite element simulations [10].
Thermo-mechanical modeling of thermal stress in metal additive manufacturing considering elastoplastic hardening
2020, CIRP Journal of Manufacturing Science and TechnologyCitation Excerpt :They have studied the effect of length of the rod and radius of the rod on thermal stress. Yilbas et al. [15] investigated the thermal stress in the laser heating of the sheet metal numerically. They concluded that the scan speed has a substantial influence on the temperature distribution and thermal stress.
Thermal Stresses in Micro- and Nanostructures
2014, Comprehensive Materials ProcessingThermal Stresses in Micro- and Nanostructures
2014, Comprehensive Materials Processing: Thirteen Volume SetThe mechanical properties of H13 die steel repaired by a biomimetic laser technique
2013, Optics and Laser TechnologyCitation Excerpt :Because of the high costs to produce a new mold, the repair technology of mold surface which can successfully extend the operation life of dies is quite significant [2]. Laser technology, such as surface treatment [3,4] and welding, is a particularly appreciated process owing to the narrow focusing zone of laser beam, a very low heat input produced in the weld bead which in turn creates a very narrow heat affected zone (HAZ), the less residual stress as well as less deformation without additional pre- and post-weld thermal treatments [5–7]. The study showed that laser welding with filler wire can be used instead of arc welding with multiple passes which usually suffers from high heat input, high distortion, and followed with expensive and time consuming work to remove the welding based changes in the product structure [8].