| People | Locations | Statistics |
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| Naji, M. |
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| Motta, Antonella |
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| Aletan, Dirar |
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| Mohamed, Tarek |
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| Ertürk, Emre |
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| Taccardi, Nicola |
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| Kononenko, Denys |
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| Petrov, R. H. | Madrid |
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| Alshaaer, Mazen | Brussels |
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| Bih, L. |
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| Casati, R. |
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| Muller, Hermance |
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| Kočí, Jan | Prague |
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| Šuljagić, Marija |
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| Kalteremidou, Kalliopi-Artemi | Brussels |
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| Azam, Siraj |
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| Ospanova, Alyiya |
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| Blanpain, Bart |
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| Ali, M. A. |
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| Popa, V. |
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| Rančić, M. |
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| Ollier, Nadège |
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| Azevedo, Nuno Monteiro |
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| Landes, Michael |
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| Rignanese, Gian-Marco |
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Pinomaa, Tatu
VTT Technical Research Centre of Finland
in Cooperation with on an Cooperation-Score of 37%
Topics
Publications (38/38 displayed)
- 2024OpenPFC:An open-source framework for high performance 3D phase field crystal simulationscitations
- 2024OpenPFCcitations
- 2024Influence of laser beam shaping on the cracking behavior of tungsten at single weld linescitations
- 2023Modelling of the Solidifying Microstructure of Inconel 718citations
- 2023Chromium-based bcc-superalloys strengthened by iron supplementscitations
- 2023Modelling of the Solidifying Microstructure of Inconel 718: Quasi-Binary Approximationcitations
- 2023Modelling of the Solidifying Microstructure of Inconel 718:Quasi-Binary Approximationcitations
- 2022Dislocation density in cellular rapid solidification using phase field modeling and crystal plasticitycitations
- 2022An atomistic simulation study of rapid solidification kinetics and crystal defects in dilute Al–Cu alloyscitations
- 2022Numerical Design Of High Entropy Super Alloy Using Multiscale Materials Modeling And Deep Learning
- 2022Multiscale analysis of crystalline defect formation in rapid solidification of pure aluminium and aluminium–copper alloyscitations
- 2022Single-Track Laser Scanning as a Method for Evaluating Printability: The Effect of Substrate Heat Treatment on Melt Pool Geometry and Cracking in Medium Carbon Tool Steelcitations
- 2022Multiscale analysis of crystal defect formation in rapid solidification of pure aluminium and aluminium-copper alloys
- 2022Laser Powder Bed Fusion Of High Carbon Tool Steels
- 2022Experimental and Calphad Methods for Evaluating Residual Stresses and Solid-State Shrinkage after Solidificationcitations
- 2022Opportunities Of Physics-Based Multi-Scale Modeling Tools In Assessing Intra-Grain Heterogeneities, Polycrystal Properties And Residual Stresses Of AM Metals
- 2021Micromechanical modeling approach to single track deformation, phase transformation and residual stress evolution during selective laser melting using crystal plasticitycitations
- 2021Quantitative phase field simulations of polycrystalline solidification using a vector order parametercitations
- 2021Orientation Gradients in Rapidly Solidified Pure Aluminum Thin Filmscitations
- 2020Development and validation of coupled erosion-corrosion model for wear resistant steels in environments with varying pHcitations
- 2020Modelling selective laser melting machine configurations
- 2020Phase field modeling of rapid resolidification of Al-Cu thin filmscitations
- 2020The significance of spatial length scales and solute segregation in strengthening rapid solidification microstructures of 316L stainless steelcitations
- 2020Phase field modeling of rapid solidification for thin films and additive manufacturing ; Nopean jähmettymisen faasikenttämallinnusta ohutkalvoille ja materiaalia lisäävälle valmistuksellecitations
- 2019Data-Driven Optimization Of Metal Additive Manufacturing Solutions
- 2019On The Linking Performance Evaluation Toolset To Process-structure-properties Mapping Of Selective Laser Melting 316L Stainless Steel Using Micromechanical Approach With A Length-scale Dependent Crystal Plasticity
- 2019Quantitative phase field modeling of solute trapping and continuous growth kinetics in quasi-rapid solidificationcitations
- 2019Process-Structure-Properties-Performance Modeling for Selective Laser Meltingcitations
- 2018Process-to-structure mapping of selective laser melting of a nickel based superalloy via phase field modelling
- 2018Micromechanical model for fatigue limit of metal AM parts and materials
- 2017Micromechanical modeling of failure behavior of metallic materialscitations
- 2016Effective interface model for design and tailoring of wc-co microstructurescitations
- 2016Modeling chloride ingress under freeze-thaw loading – 3D fem approach
- 2016Modeling chloride ingress under freeze-thaw loading – 3D fem approach
- 2016Component scale process model for metal additive manufacturing
- 2015Effective interface model for design and tailoring of wc-co microstructures
- 2015Mesoscale modelling of short crack initiation in metallic selective laser melting microstructures
- 2015Phase field analysis of solidification structures and interface composition in WC-Co hard metals
Places of action
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article
Influence of laser beam shaping on the cracking behavior of tungsten at single weld lines
Abstract
<p>In the state of-the art, Tungsten (W) as a crack prone material in laser processing is being investigated with different approaches that influence the cooling behavior and thermomechanical conditions during processing. Investigations in the present paper analyze the application of laser beam shaping and, therefore, the adjustment and homogenization of the laser intensity input at single weld lines on pure tungsten sheets. Additionally, the laser beam size in the processing zone is varied by a factor of max. 1.9. Experiments show that the reduction of the peak laser intensities, in the range of 9,120–9,600 kW/cm<sup>2</sup> at ring-shaped beam profiles, compared to laser intensities in the region of maximal 47,200 kW/cm<sup>2</sup> at Gaussian beam profiles result in a significant crack reduction and crack avoidance. Also contributing to the crack reduction is the emerging equiaxed solidification morphology in the fusion zone at applied ring-shaped beam profiles and at the enlargement of the Gaussian beam profile. Resulting lower laser intensities at larger beam profiles at a magnification factor of 1.9 at the ring-shaped beam profile and the Gaussian beam profile show, besides the crack avoidance, a high potential for a process speed enhancement at Powder Bed Fusion of Metals using a laser-based system (PBF-LB/M) in future applications. Therefore, concerning the melt pool geometry and the emerging microstructure, the Gaussian and ring-shaped beam profile at a comparable beam diameter show similar results. Due to the severe enlargement of the melt pool width at a decent penetration depth at aspect ratios d/w < 0.5 in the conduction welding regime, adapted beam profiles can, therefore, drastically influence the cooling behavior with reduced cracking as well as enhance the process speed and eliminate process faults like keyhole porosity.</p>