Journal
FINITE ELEMENTS IN ANALYSIS AND DESIGN
Volume 189, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.finel.2021.103528
Keywords
Additive manufacturing; Laser powder bed fusion; Thermomechanical simulation; Inconel 718; Multiscale modeling; Residual stress
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Funding
- Research Strengthening Project of the Faculty of Engineering
- King Mongkut's University of Technology Thonburi
- Thailand Science Research and Innovation (TSRI) Basic Research Fund: Fiscal year 2021 [64A306000054]
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The study developed a finite element framework to predict part-scale residual stress in the LPBF process of Inconel 718, using two-scale models coherently.
Residual stress has been among the primary problems in the laser powder bed fusion (LPBF) additive manufacturing. Nevertheless, complex physics and multi-scale nature of the problem make an accurate prediction of residual stress at the part level a great challenge. Thus, the present study developed the finite element framework to predict the part scale residual stress development in the LPBF of Inconel 718. Two-scale models were used coherently. A mesoscale model calculated the stress formation in a deposited powder layer by considering the influence of process conditions and scan strategies. Subsequently, the inherent strain approach was used for the part level prediction. The inherent strain values were estimated according to numerical results from the mesoscale model. Numerical validation was made by comparing the transient development of residual stress with reported measurements from the neutron diffraction of over 200 data points. The proposed framework provided the prediction which matched excellently with experimental results. Ultimately, the present study established the proven framework which could be used for further investigation on part scale-related issues in the LPBF process.
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