Numerical Evaluation of Advanced Laser Control Strategies Influence on Residual Stresses for Laser Powder Bed Fusion Systems
| Autor: | Ho Yeung, Alessandro Reali, Stefan Kollmannsberger, Ferdinando Auricchio, Massimo Carraturo, Brandon M. Lane |
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| Rok vydání: | 2020 |
| Předmět: |
010302 applied physics
Materials science Structural material Nuclear engineering 02 engineering and technology Fusion power 021001 nanoscience & nanotechnology Laser 01 natural sciences Industrial and Manufacturing Engineering Finite element method law.invention Superalloy law Residual stress 0103 physical sciences General Materials Science Laser power scaling Selective laser melting 0210 nano-technology |
| Zdroj: | Integrating Materials and Manufacturing Innovation. 9:435-445 |
| ISSN: | 2193-9772 2193-9764 |
| DOI: | 10.1007/s40192-020-00191-3 |
| Popis: | Process-dependent residual stresses are one of the main burdens to a widespread adoption of laser powder bed fusion technology in industry. Residual stresses are directly influenced by process parameters, such as laser path, laser power, and speed. In this work, the influence of various scan speed and laser power control strategies on residual stresses is investigated. A set of nine different laser scan patterns is printed by means of a selective laser melting process on a bare plate of nickel superalloy 625 (IN625). A finite element model is experimentally validated comparing the simulated melt pool areas with high-speed thermal camera in situ measurements. Finite element analysis is then used to evaluate residual stresses for the nine different laser scan control strategies, in order to identify the strategy which minimizes the residual stress magnitude. Numerical results show that a constant power density scan strategy appears the most effective to reduce residual stresses in the considered domain. |
| Databáze: | OpenAIRE |
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