Numerical investigations on hatching process strategies for powder-bed-based additive manufacturing using an electron beam
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This paper investigates in hatching process strategies for additive manufacturing using an electron beam by numerical simulations. The underlying physical model and the corresponding three-dimensional thermal free-surface lattice Boltzmann method of the simulation software are briefly presented. The simulation software has already been validated on the basis of experiments up to 1.2kW beam power by hatching a cuboid with a basic process strategy, whereby the results are classified into porous, good, and uneven, depending on their relative density and top surface smoothness. In this paper, we study the limitations of this basic process strategy in terms of higher beam powers and scan velocities to exploit the future potential of high power electron beam guns up to 10kW. Subsequently, we introduce modified process strategies, which circumvent these restrictions, to build the part as fast as possible under the restriction of a fully dense part with a smooth top surface. These process strategies are suitable to reduce the build time and costs, maximize the beam power usage, and therefore use the potential of high power electron beam guns.
KeywordsPowder-bed-based additive manufacturing Selective electron beam melting Hatching process strategy Thermal-free surface lattice Boltzmann method
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- 2.Ammer R, Rüde U, Markl M, Jüchter V, Körner C (2014) Validation experiments for lbm simulations of electron beam melting. Int J Modern Phys C 25(2). doi: 10.1142/S0129183114410095
- 4.Boyer R, Welsch G, Collings EW (eds) (1998) Material properties handbook: titanium alloys. In: Boyer R, Welsch G, Collings EW (eds) Material properties handbook, ASM InternationalGoogle Scholar
- 8.Handbook Committee ASM International (ed) (1990) Metals handbook: properties and selection—nonferrous alloys and special-purpose materials, metals handbook, vol 2. ASM InternationalGoogle Scholar
- 11.Higuera F, Jimenez J (1989) Boltzmann approach to lattice gas simulations. Europhys Lett:9Google Scholar
- 13.Klassen A, Scharowsky T, Körner C (2014) Evaporation model for beam based additive manufacturing using free surface lattice boltzmann methods. J Phys D: Appl Phys 47(27). doi: 10.1088/0022-3727/47/27/275303
- 18.Markl M, Ammer R, Ljungblad U, Rüde U, Körner C (2013) Electron beam absorption algorithms for electron beam melting processes simulated by a three-dimensional thermal free surface lattice Boltzmann method in a distributed and parallel environment. Procedia Comput Sci 18:2127–2136. doi: 10.1016/j.procs.2013.05.383. 2013 International Conference on Computational ScienceCrossRefGoogle Scholar
- 20.McNamara G, Zanetti C (1988) Use of the Boltzmann equation to simulate lattice-gas automata. Phys Rev Lett:61Google Scholar
- 21.Murr L, Amato K, Li S, Tian Y, Cheng X, Gaytan S, Martinez E, Shindo P, Medina F, Wicker R (2011) Microstructure and mechanical properties of open-cellular biomaterials prototypes for total knee replacement implants fabricated by electron beam melting. J Mech Behav Biomed Mater 4(7):1396–1411CrossRefGoogle Scholar
- 23.Rawal S, Brantley J, Karabudak N (2013) Additive manufacturing of Ti-6Al-4V alloy components for spacecraft applications. In: 2013 6th international conference on recent advances in space technologies (RAST), pp 5–11. doi: 10.1109/RAST.2013.6581260