METAL PARTS MANUFACTURING BY ELECTRON BEAM ADDITIVE TECHNOLOGIES

General information about development of additive technologies, as well as an overview of the main schema- tics of layer by layer manufacturing of metal products is presented. The technologies and equipment for electron beam layerby-layer production of metal products using wire and powder as a raw material is described. Experimental data obtained by the authors as a result of electron beam additive manufacturing of low-carbon steel, stainless austenitic steel and technical titanium samples are described. Relations between the product geometry and the electron beam main parameters are obtained. The analysis of microstructures is carried out. The main zones formed in the samples fabricated by this method are described. It is shown that typical microstructure of stainless steel samples consists of the large dendrites with main axes up to a few millimeters in the direction of heat sink. In a pure titanium, in addition to the characteristic coarse-grained (up to several millimeters in diameter) structure, there are zones where a lamellar structure with colonies of about 1 mm is observed, as well as a zone in the form of a strip about 1 mm wide along the walls, which is an acicular structure. This is obviously related to the cooling mode, since the character of the heat sink along the edges of the sample differs from the central zones. The analysis of electron beam additive technologies prospects is carried out. Examples of electron beam additive technology using in modern fabrication of accelerator technics, aircraft and machine building are demonstrated.

1. Frazier W. E. Digital Manufacturing of Metallic Components. Available at: https://sffsymposium.engr.utexas.edu/Manuscripts/2010/2010-60-Frazier.pdf (Accessed 13 October 2017).

2. Guo N., Leu M. C. Additive manufacturing: technology, applications and research needs. Frontiers of Mechanical Engineering, 2013, vol. 8, no. 3, pp. 215–243. https://doi.org/10.1007/s11465-013-0248-8

3. Pham D. T., Dimov S. S. Rapid prototyping and rapid tooling - the key enablers for rapid manufacturing. Proceedings of the Institution of Mechanical Engineers. Part C: Journal of Mechanical Engineering Science, vol. 217, no. 1, pp. 1–23. https://doi.org/10.1243/095440603762554578

4. Ek K. Additive Manufactured Material: Master of Science Thesis MMK 2014:19 MKN 109 KTH Industrial Engineering and Management Machine Design. Stockholm, Sweden, 2014. 102 p.

5. Hardware of ARCAM electron beam melting equipment. Available at: http://www.arcam.com/technology/electronbeam-melting/hardware/ (Accessed 13 October 2017).

6. Zlenko M. A., Nagaitsev M. V., Dovbysh V. M. Additive technologies in mechanical engineering: a manual for engineers. Moskow, Research Automobile and Automotive Institute Publ., 2015. 220 p. (in Russian).

7. Electron Beam Melting (EBM). Available at: http://www.camplex.com.au/ebm-electron-beam-melting/ (Accessed 13 October 2017).

8. EBM® Electron Beam Melting in the forefront of Additive Manufacturing. Arcam EBM. Available at: http://www.arcam.com/technology/electron-beam-melting/ (Accessed 13 October 2017)

9. Powder Handling. Arcam EBM. Available at: http://www.arcam.com/technology/products/powder-handling/ (Accessed 13 October 2017).

10. Sames, W. J., List F. A., Pannala S., Dehoff R. R., Babu S. S. The metallurgy and processing science of metal additive manufacturing. International Materials Reviews, 2016, vol. 61, iss. 5, pp. 315–360. https://doi.org/10.1080/09506608.2015.1116649

11. Chongbin Wei, Xiaolin Ma, Xiaojie Yang, Meng Zhou, Caimei Wang, Yufeng Zheng, Weiping Zhang, Zhijiang Li. Microstructural and property evolution of Ti6Al4V powders with the number of usage in additive manufacturing by electron beam melting. Materials Letters, 2018, vol. 221, pp. 111–114. https://doi.org/10.1016/j.matlet.2018.03.124

12. Make Metal Parts Faster & Cheaper Than Ever with Electron Beam Additive Manufacturing (EBAM®) Systems or Services. Sciaky Inc. Available at: http://www.sciaky.com/additive-manufacturing/electron-beam-additive-manufacturing-technology (Accessed 13 October 2017).

13. Taminger K. M. B., Hafley R. A. Electron beam freeform fabrication: a rapid metal deposition. Proceedings of the 3rd Annual Automotive Composites Conference, September 9–10, 2003, Troy, MI, Society of Plastic Engineers. Available at: http://www.cs.odu.edu/~mln/ltrs-pdfs/NASA-2003-3aacc-kmt.pdf (Accessed 13 October 2017).

14. Bakinovskiy A. A., Burin A. A. Investigation of possibility of using electron beam welding equipment for layer by layer fabrication of samples from wire. Sb. nauch. tr. Mezhdunar. konf. «Sovremennye metody i tekhnologii sozdaniya i obrabotki materialov», g. Minsk, 14–16 sent. 2016 g. Kn. 2 [Book of conference “Modern methods and technologies of materials fabrication and treatment”, Minsk, 14–16 September. Book 2]. Minsk, 2016, pp. 15–20 (in Russian)

15. Benson Tolle T. H., Shoeppner G. A. Accelerating Materials Insertion by Evolving the DoD Materials Qualification-Transition Paradigm. Advanced Materials, Manufacturing and Testing Information Analysis Center, 2002, vol. 6, no. 1, pp. 3–6.

16. Stecker S., Lachenberg K. W., Wang H., Salo R. C. Advanced electron beam free form fabrication methods and technology. 87th Annual Convention Professional American Welding Society, 2006. Session 2: Electron Beam Welding. Available at: http://files.aws.org/conferences/abstracts/2006/012.pdf (Accessed 13 October 2017).