Mathematical modeling of the process of selective laser melting of Ti-6Al-4V titanium alloy powder

Abstract


A digital (finite element) model has been developed for heating and melting of a layer of metal powder under conditions of its heating by a laser heat flux using a modern standard software product for assessing the geometric parameters of a molten bath brought about by the action of laser radiation on a layer of Ti-6Al-4V titanium alloy metal powder. The model takes into account latent heat released during the phase transition of the material; melting of the material in the temperature range of solidus and liquidus; radiation and convection from the surface of a layer of metal powder. It has been established that the formation of interlayer defects arising from inadequate penetration between layers or insufficient overlap between tracks is the main reason for the formation of porosity in materials synthesized by selective laser melting technology. So the depth of the molten bath should be at least 1.5 of the layer thickness for the synthesis of dense material. The results of numerical simulations made it possible to determine the range of technological scanning parameters upon application of which a melt pool with a depth of more than 75 μm is formed.


About the authors

A. V. Agapovichev

Samara National Research University

Author for correspondence.
Email: agapovichev5@mail.ru

Russian Federation

Senior Lecturer of the Department of Engine Production Technology

A. V. Sotov

Peter the Great Saint Petersburg Polytechnic University

Email: sotovanton@yandex.ru

Russian Federation

Candidate of Science (Engineering),
Researcher at the Design of Materials and Additive Manufacturing Laboratory

V. G. Smelov

Samara National Research University

Email: pdla_smelov@mail.ru

Russian Federation

Candidate of Science (Engineering),
Associate Professor of the Department of Engine Production Technology

References

  1. Bogdanovich V.I., Giorbelidze M.G., Sotov A.V., Pronichev N.D., Smelov V.G., Agapovichev A.V. Mathematical modeling of powder melting process in selective laser melting technology. Izvestiya Samarskogo Nauchnogo Tsentra RAN. 2017. V. 19, no. 4. P. 105-114. (In Russ.)
  2. Qiu C., Adkins N.J.E., Hassanin H., Attallah M.M., Essa K. In-situ shelling via selective laser melting: Modelling and microstructural characterization. Materials & Design. 2015. V. 87. P. 845-853. doi: 10.1016/j.matdes.2015.08.091
  3. Ali H., Ma L., Ghadbeigi H., Mumtaz K. In-situ residual stress reduction, martensitic decomposition and mechanical properties enhancement through high temperature powder bed pre-heating of selective laser melted Ti6Al4V. Materials Science & Engineering: A. 2017. V. 695. P. 211-220. doi: 10.1016/j.msea.2017.04.033
  4. Heeling T., Cloots M., Wegener K. Melt pool simulation for the evaluation of process parameters in selective laser melting. Additive Manufacturing. 2017. V. 14. P. 116-125. doi: 10.1016/j.addma.2017.02.003
  5. Meiners W., Wissenbach K., Poprawe R. Direct generation of metal parts and tools by selective laser powder remelting (SLPR). International Congress on Applications of Lasers & Electro-Optics. 1998. doi: 10.2351/1.5059149
  6. Kurzynowski T., Chlebus E., Kuźnicka B., Reiner J. Parameters in selective laser melting for processing metallic. High Power Laser Materials Processing: Lasers, Beam Delivery, Diagnostics, and Applications. 2012. V. 8239. doi: 10.1117/12.907292
  7. Marc® 2016. Volume A: Theory and User Information. MSC Software Corporation, 2016. 967 p.
  8. Kumar C., Das M., Biswas P. A 3-D finite element analysis of transient temperature profile of laser welded Ti-6Al-4V alloy. Lasers Based Manufacturing. 2015. P. 421-440. doi: 10.1007/978-81-322-2352-8_21
  9. Goldak J., Chakravarti A., Bibby M. A new finite element model for welding heat sources. Metallurgical Transactions B. 1984. V. 15, Iss. 2. P. 299-305. doi: 10.1007/BF02667333
  10. Zinovieva O., Zinoviev A., Ploshikhin V. Three-dimensional modeling of the microstructure evolution during metal additive manufacturing. Computational Materials Science. 2018. V. 141. P. 207-220. doi: 10.1016/j.commatsci.2017.09.018
  11. Illarionov A.G., Popov A.A. Tekhnologicheskie i ekspluatatsionnye svoystva titanovykh splavov: uchebnoe posobie [Fabrication and performance characteristics of titanium alloys: training manual]. Ekaterinburg: Ural Federal University Publ., 2014. 137 p.
  12. Gong H., Gu H., Zeng K., Dilip J.J.S., Pal D., Stucker B., Christiansen D., Beuth J., Lewandowski J. Melt pool characterization for selective laser melting of Ti-6Al-4V pre-alloyed powder. 25th Annual International Solid Freeform Fabrication Symposium (August, 4-6, 2014, Austin, USA).
  13. Dilip J.J.S., Zhang S., Teng C., Zeng K., Robinson C., Pal D., Stucker B. Influence of processing parameters on the evolution of melt pool, porosity, and microstructures in Ti-6Al-4V alloy parts fabricated by selective laser melting. Progress in Additive Manufacturing. 2017. V. 2, Iss. 3. P. 157-167. doi: 10.1007/s40964-017-0030-2

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