TY - JOUR
T1 - Direct laser metal deposition additive manufacturing of Inconel 718 superalloy
T2 - Statistical modelling and optimization by design of experiments
AU - Moradi, Mahmoud
AU - Hasani, Arman
AU - Pourmand, Zeynab
AU - Lawrence, Jonathan
PY - 2021/12
Y1 - 2021/12
N2 - Direct laser metal deposition (DLMD) technique is used for additive manufacturing (AM) of Inconel 718 Ni-based superalloy using full factorial design. A 1 kW fiber laser is applied with a coupled coaxial nozzle head. Laser scanning speed (2.5–5.0 mm/s), powder feed rate (17.94–28.52 g/min), and scanning strategies (Unidirectional, Bidirectional) were considered as the input process variables while geometrical dimensions (height, width average), standard deviation of microhardness, and the stability of additively manufactured walls were determined as process responses. The influence of process parameters on the responses variations were studied by analysis of variance (ANOVA). Results indicated that low scanning speed and high powder feed rate caused to increase in height and average width of AM samples. Due to microstructural phases, the microhardness changes have an unstable trend. Results show that a stable wall was obtained in low scanning speed and unidirectional scanning pattern. In order to achieve a desired condition for the DLMD additive manufacturing process, optimization was conducted based on the applied statistical analyses. The scanning speed of 2.5 mm/s, the powder feed rate of 28.52 g/min, and unidirectional scanning pattern were identified as the optimum conditions.
AB - Direct laser metal deposition (DLMD) technique is used for additive manufacturing (AM) of Inconel 718 Ni-based superalloy using full factorial design. A 1 kW fiber laser is applied with a coupled coaxial nozzle head. Laser scanning speed (2.5–5.0 mm/s), powder feed rate (17.94–28.52 g/min), and scanning strategies (Unidirectional, Bidirectional) were considered as the input process variables while geometrical dimensions (height, width average), standard deviation of microhardness, and the stability of additively manufactured walls were determined as process responses. The influence of process parameters on the responses variations were studied by analysis of variance (ANOVA). Results indicated that low scanning speed and high powder feed rate caused to increase in height and average width of AM samples. Due to microstructural phases, the microhardness changes have an unstable trend. Results show that a stable wall was obtained in low scanning speed and unidirectional scanning pattern. In order to achieve a desired condition for the DLMD additive manufacturing process, optimization was conducted based on the applied statistical analyses. The scanning speed of 2.5 mm/s, the powder feed rate of 28.52 g/min, and unidirectional scanning pattern were identified as the optimum conditions.
UR - https://pureportal.coventry.ac.uk/en/publications/direct-laser-metal-deposition-additive-manufacturing-of-inconel-718-superalloy(d9675ff9-6c30-4be8-b84d-d670a46e8ad8).html
U2 - 10.1016/j.optlastec.2021.107380
DO - 10.1016/j.optlastec.2021.107380
M3 - Article
SN - 0030-3992
VL - 144
JO - Optics and Laser Technology
JF - Optics and Laser Technology
M1 - 107380
ER -