Numerical Simulation of Surface Softening Behavior for Laser Heat Treated Cu-Bearing Medium Carbon Steel

Sim, Ahjin; Chun, Eun−Joon; Cho, Dae-Won

doi:10.1007/s12540-019-00577-9

Cited by 10 publications

(2 citation statements)

References 30 publications

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“…In particular, the initial temperature condition of the cut front assumes that the kerf wall is mostly near the melting temperature when the laser is melted and blown out by the gas. The model used in this study is energy conservation and is expressed as Equation (1) [24,25].…”

Section: Resultsmentioning

confidence: 99%

Analysis of Laser Cutting Process for Different Diagonal Material Shapes

et al. 2022

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In this study, the laser cutting characteristics were analyzed according to the shape of the back side of the specimen, and the laser cutting characteristics were compared according to the thickness of the edge (10 mm, 20 mm, and 30 mm). A Yb-YAG laser was used in this study, and the cutting target was STS304 with a thickness of 50 mm, and the cutting process was analyzed using a high-speed camera. In the experiment, it was found through image analysis that the cutting performance was excellent at 30 mm thickness of the edge. In order to analyze this reason, a thermal conduction analysis (numerical simulation) was performed, and it was confirmed that the thicker thickness of the edge caused a preheating effect during laser cutting due to a large amount of heat accumulation. This effect can be used as a reference for the initial processing state while cutting thick metals as it is a characteristic that has not been revealed before.

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Section: Resultsmentioning

confidence: 99%

Analysis of Laser Cutting Process for Different Diagonal Material Shapes

et al. 2022

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“…And the boundary condition refers to the heat convection of the parent metals at ambient temperature. As the cooling medium has a significant influence on the temperature field and microstructure of the FeCoCrNi HEAs coating [32], it is critical to define the correct convective heat transfer coefficient, which is determined by the cooling medium. The convective heat transfer coefficient is set to be 40 [J/(m 2 K)] since air is the cooling medium in this research [33], while the boundary convection condition is applied to all external surfaces of the finite element model.…”

Section: The Initial and Boundary Conditionmentioning

confidence: 99%

Analysis of Elements Non-Uniform Distribution of FeCoCrNi High-Entropy Alloy Coatings on Ti–6Al–4V Surface by Laser Cladding

Duan

Zhan

et al. 2021

Met. Mater. Int.

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The evolution of element distribution during laser cladding involves two dynamic behaviors, i.e., liquid molten pool flow and FeCoCrNi high-entropy alloy (HEA) coatings solidification. However, it is quite difficult to characterize element distribution during the flow of the liquid molten pool rigorously. The current investigation conducted the optical microscopy, scanning electron microscopy, X-ray diffraction analysis and energy dispersive spectrometer to study the dilution, phase composition, microstructure of the FeCoCrNi coatings. The flow field was simulated to uncover the dynamic change mechanism of the molten pool and explain the experimental results. The results indicated that the coating is substantially composed of FCC and BCC solid solution with a typical dendrite microstructure. Gray Laves phase-(Ni, Co) 2 Ti and a small number of white dot particles, Fe-Cr phase, are dispersed in the inter-dendritic region. The HEA atoms (Fe, Co, Cr, Ni) gradually aggregate from the center to the side at the coating boundary region, while the Ti atom is the opposite. The Marangoni flow inflection point at the molten pool boundary will cause HEA atoms to aggregate. On the contrary, Ti atom enters the molten pool from the bottom with the heat buoyance flow and then migrates to the boundary along with the Marangoni flow. Therefore, the content of Ti in the coating boundary decreases. The Marangoni flow, heat buoyance flow, and recoil pressure flow are interwoven in the middle region of the coating, resulting in a more uniform element distribution than the boundary region.

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Improvement of Desulfurization Efficiency via Numerical Simulation Analysis of Transport Phenomena of Kanbara Reactor Process

Lee

2021

Met. Mater. Int.

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Numerical Simulation of Surface Softening Behavior for Laser Heat Treated Cu-Bearing Medium Carbon Steel

Cited by 10 publications

References 30 publications

Analysis of Laser Cutting Process for Different Diagonal Material Shapes

Analysis of Laser Cutting Process for Different Diagonal Material Shapes

Analysis of Elements Non-Uniform Distribution of FeCoCrNi High-Entropy Alloy Coatings on Ti–6Al–4V Surface by Laser Cladding

Improvement of Desulfurization Efficiency via Numerical Simulation Analysis of Transport Phenomena of Kanbara Reactor Process

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