TY - JOUR
T1 - Laser intensity profile as a means to steer microstructure of deposited tracks in Directed Energy Deposition
AU - Bremer, Scholte J.L.
AU - Luckabauer, Martin
AU - Römer, Gert-Willem R.B.E.
N1 - Funding Information:
This research was carried out under project number P16-46/S17024m, which is part of Aim2XL program, in the framework of the Partnership Program of the Materials innovation institute M2i (www.m2i.nl) and the Netherlands Organization for Scientific Research (www.nwo.nl). The research was conducted in collaboration with industrial partners and supported by the Rotterdam Fieldlab Additive Manufacturing BV (RAMLAB), (www.ramlab.com).
Funding Information:
Authors would like to thank N. Helthuis for his help in preparing and analysing the EBSD samples. This research was carried out under project number P16-46/S17024m, which is part of Aim2XL program, in the framework of the Partnership Program of the Materials innovation institute M2i (www.m2i.nl) and the Netherlands Organization for Scientific Research (www.nwo.nl). The research was conducted in collaboration with industrial partners and supported by the Rotterdam Fieldlab Additive Manufacturing BV (RAMLAB), (www.ramlab.com).
Publisher Copyright:
© 2023 The Author(s)
PY - 2023/3
Y1 - 2023/3
N2 - In Laser-based Directed Energy Deposition (L-DED) the laser-induced spatial and temporal thermal cycles strongly determine the microstructure of deposited layers. The effect of three different laser intensity profiles (beam shapes) on the shape of the melt pool and the resulting microstructure was studied. To this end, thermal gradients and growth rates, derived from measured melt pool emissions, are compared to characteristics of the microstructure in the deposited tracks. These characteristics are obtained using Electron Back Scatter Diffraction (EBSD). It was found that the shape of the laser beam strongly affects the melt pool morphology. Therefore it affects also the solidification characteristics and thus the resulting microstucture. Correlations are found between the thermal gradient - growth rate ratios and the grain shapes and amount of texture. Hence, the beam profile is a tool to steer the microstructure of deposited parts during L-DED.
AB - In Laser-based Directed Energy Deposition (L-DED) the laser-induced spatial and temporal thermal cycles strongly determine the microstructure of deposited layers. The effect of three different laser intensity profiles (beam shapes) on the shape of the melt pool and the resulting microstructure was studied. To this end, thermal gradients and growth rates, derived from measured melt pool emissions, are compared to characteristics of the microstructure in the deposited tracks. These characteristics are obtained using Electron Back Scatter Diffraction (EBSD). It was found that the shape of the laser beam strongly affects the melt pool morphology. Therefore it affects also the solidification characteristics and thus the resulting microstucture. Correlations are found between the thermal gradient - growth rate ratios and the grain shapes and amount of texture. Hence, the beam profile is a tool to steer the microstructure of deposited parts during L-DED.
KW - Directed energy deposition
KW - EBSD
KW - Laser beam shape
KW - Melt pool imaging
KW - Stainless steel
KW - UT-Gold-D
UR - http://www.scopus.com/inward/record.url?scp=85148544782&partnerID=8YFLogxK
U2 - 10.1016/j.matdes.2023.111725
DO - 10.1016/j.matdes.2023.111725
M3 - Article
AN - SCOPUS:85148544782
SN - 0264-1275
VL - 227
JO - Materials and Design
JF - Materials and Design
M1 - 111725
ER -