A fully coupled thermal–microstructural–mechanical finite element modelling framework is developed to investigate the distortion and residual stresses during directed energy deposition (DED) of multi-phase Ti–6Al–4V alloy. The Johnson–Cook constitutive model is used to predict the yield strength of each phase as a function of strain, strain rate and temperature where the flow stress is calculated by a linear mixing rule based on the volumetric phase fractions. A thin-walled rectangular sample is chosen as the reference geometry and the results are compared with experimentally measured in situ thermal history and distortion data, where a reasonable agreement is achieved. The proposed modelling framework with physics-based material constitutive model provides useful information for a better understanding of process–microstructure–property relations in additive manufacturing by DED.
Tunay, Merve, et al. "A fully coupled thermal–microstructural–mechanical finite element process model for directed energy deposition additive manufacturing of Ti–6Al–4V." Science and Technology of Welding and Joining, vol. 28, no. 2, Jan. 2023. https://doi.org/10.1080/13621718.2022.2127211
Tunay, Merve, Baykasoğlu, Cengiz, Akyildiz, Oncu, & Albert, C. (2023). A fully coupled thermal–microstructural–mechanical finite element process model for directed energy deposition additive manufacturing of Ti–6Al–4V. Science and Technology of Welding and Joining, 28(2). https://doi.org/10.1080/13621718.2022.2127211
Tunay, Merve, Baykasoğlu, Cengiz, Akyildiz, Oncu, et al., "A fully coupled thermal–microstructural–mechanical finite element process model for directed energy deposition additive manufacturing of Ti–6Al–4V," Science and Technology of Welding and Joining 28, no. 2 (2023), https://doi.org/10.1080/13621718.2022.2127211
@article{osti_2426667,
author = {Tunay, Merve and Baykasoğlu, Cengiz and Akyildiz, Oncu and Albert, C.},
title = {A fully coupled thermal–microstructural–mechanical finite element process model for directed energy deposition additive manufacturing of Ti–6Al–4V},
annote = {A fully coupled thermal–microstructural–mechanical finite element modelling framework is developed to investigate the distortion and residual stresses during directed energy deposition (DED) of multi-phase Ti–6Al–4V alloy. The Johnson–Cook constitutive model is used to predict the yield strength of each phase as a function of strain, strain rate and temperature where the flow stress is calculated by a linear mixing rule based on the volumetric phase fractions. A thin-walled rectangular sample is chosen as the reference geometry and the results are compared with experimentally measured in situ thermal history and distortion data, where a reasonable agreement is achieved. The proposed modelling framework with physics-based material constitutive model provides useful information for a better understanding of process–microstructure–property relations in additive manufacturing by DED.},
doi = {10.1080/13621718.2022.2127211},
url = {https://www.osti.gov/biblio/2426667},
journal = {Science and Technology of Welding and Joining},
issn = {ISSN 1362-1718},
number = {2},
volume = {28},
place = {United Kingdom},
publisher = {SAGE Publications},
year = {2023},
month = {01}}