Journal article
(Original article)


Numerical simulation of multi-component evaporation during selective electron beam melting of TiAl


Publication Details
Author(s): Klassen A, Forster V, Jüchter V, Körner C
Publisher: Elsevier Ltd
Publication year: 2017
Volume: 247
Pages range: 280-288
ISSN: 0924-0136
Language: English

Abstract

Powder-based additive manufacturing technologies such as selective laser melting (SLM) and selective electron beam melting (SEBM) hold great promise for producing high-value metal components with customized geometries. Development of scanning strategies and prediction of optimal process parameters thereby remain key factors for the fabrication of high-quality products without local inhomogeneities in alloy composition or porosity. In this contribution, the relation between energy input, evaporation and residual porosity is numerically investigated on the titanium aluminide alloy Ti-48Al-2Cr-2Nb. The numerical model is based on a lattice Boltzmann method and includes hydrodynamics, thermodynamics and multi-component evaporation. Simulation results show that the spatial distribution of alloying elements within the final part is dominated by the advection of melt which is driven by surface tension and evaporative recoil and influenced by the random arrangement of powder particles. Regarding evaporation losses, the line energy appears to be of central importance, as it strongly affects peak temperatures during processing. For a given melt strategy there is a trade-off between porosity and loss of aluminum due to evaporation. It is demonstrated that significant reductions in evaporation losses can be achieved by application of a suitable beam scanning strategy. The presented numerical findings are consistent with experimental data.



Focus Area of Individual Faculties


How to cite
APA: Klassen, A., Forster, V., Jüchter, V., & Körner, C. (2017). Numerical simulation of multi-component evaporation during selective electron beam melting of TiAl. Journal of Materials Processing Technology, 247, 280-288. https://dx.doi.org/10.1016/j.jmatprotec.2017.04.016

MLA: Klassen, Alexander, et al. "Numerical simulation of multi-component evaporation during selective electron beam melting of TiAl." Journal of Materials Processing Technology 247 (2017): 280-288.

BibTeX: Download
Share link
Last updated on 2017-09-19 at 03:59
PDF downloaded successfully