Journal
OPTICS AND LASER TECHNOLOGY
Volume 140, Issue -, Pages -Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.optlastec.2020.106782
Keywords
Finite element; Multilayer; Temperature field; Stress field
Categories
Funding
- National Natural Science Foundation of China [51905497]
- Major Science and Technology Projects of Shanxi Province, China [20181102012]
- Scientific and Technological Innovation Programs of Higher Education Institutions in Shanxi [2019L0559]
- Transformation of Scientific and Technological Achievements Programs of Higher Education Institutions in Shanxi [2019L0430]
- Support Program for Young Academic Leaders of North University of China [QX201902]
- Shanxi Province Graduate Student Innovation Project [2020BY094]
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This study investigated the temperature field and stress field of a multilayer metal powder using the point exposure scanning mode. A three-dimensional thermo-structural coupling model was established and the SLM process was simulated. The residual stress distribution on the upper surface had strong volatility, and the accuracy of the numerical simulation was verified by experimental data on the molten pool size.
In this study, the temperature field and the stress field of a multilayer metal powder were investigated using the point exposure scanning mode. A three-dimensional thermo-structural coupling model was established by using the finite element method, and the multi-layer multi-track SLM process was simulated. The model considered the latent heat of phase change, physical parameters with temperature change, convective heat transfer, and so on. The temperature, molten pool and stress changes at different positions were analyzed, and finally the residual stress distribution of the model was obtained. The residual stress distribution on the upper surface of the SLM fabricating part under point exposure scanning had strong volatility, which was different from continuous exposure scanning. The maximum residual stress appeared at the end of the first track in the first layer. The reliability of the numerical simulation was verified by the size of the molten pool in the experiment.
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