Microstructure analysis and mechanical properties of electron beam powder bed fusion (PBF-EB)-manufactured γ-titanium aluminide (TiAl) at elevated temperatures
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Daniel Kotzem
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Mirko Teschke
Abstract
Additively manufactured γ-titanium aluminide has a high specific strength and temperature resistance. This opens new possibilities for future lightweight constructions for aerospace applications. The objective of this work was to characterize additively manufactured Ti–48Al–2Cr–2Nb alloy specimens, which were successfully manufactured by electron beam powder bed fusion. For microstructural characterization, the as-built state was investigated with light and scanning electron microscopy. In the electron backscatter diffraction analysis, the size and the orientation of the grains were observed. The pore size and distribution were examined in computer tomographic scans, which showed a near fully dense material with a relative density of >99.9%. Furthermore, the hardness curve over the building height was examined in hardness mappings. Thereby, a strong decrease in hardness could be observed with an increase in part height. To evaluate the reliability of the manufactured alloy, quasi-static compression tests were carried out at temperatures up to 650 °C. Within these tests, a high compression strength (σc,p,0.2,650 °C = 684 MPa) was determined, which implicated a potential substitution of nickel-based superalloy components in aerospace applications under compressive loads.
Funding source: Deutsche Forschungsgemeinschaft http://dx.doi.org/10.13039/501100001659
Award Identifier / Grant number: 379213719 404665753
Acknowledgment
The authors thank the German Research Foundation (DFG, Deutsche Forschungsgemeinschaft) for its financial support within the research projects “Microstructure and defect controlled additive manufacturing of gamma titanium aluminides for function-based control of local materials properties” (project no. 404665753) and “Damage tolerance evaluation of electron beam melted cellular structures by advanced characterization techniques” (project no. 379213719). The authors thank K. Chrzan from TU Dortmund University for her support in the microstructural characterization and the central workshop at TU Dortmund University, especially D. Lamb and V. Brueggemann for machining the specimens.
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Author contributions: All the authors have accepted responsibility for the entire content of this submitted manuscript and approved submission.
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Research funding: This research was funded by German Research Foundation (DFG, Deutsche Forschungsgemeinschaft) under Project Numbers (404665753 and 379213719).
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Conflict of interest statement: The authors declare no conflicts of interest regarding this article.
References
[1] E. Akca and A. Gürsel, “A review on superalloys and IN718 nickel-based inconel superalloy,” Period. Eng. Nat. Sci., vol. 3, no. 1, pp. 15–27, 2015, https://doi.org/10.21533/pen.v3i1.43.Search in Google Scholar
[2] R. R. Boyer, J. D. Cotton, M. Mohaghegh, and R. E. Schafrik, “Materials considerations for aerospace applications,” MRS Bull., vol. 40, no. 12, pp. 1055–1066, 2015, https://doi.org/10.1557/mrs.2015.278.Search in Google Scholar
[3] E. Schubert, M. Klassen, I. Zerner, C. Walz, and G. Sepold, “Light-weight structures produced by laser beam joining for future applications in automobile and aerospace industry,” J. Mater. Process. Technol., vol. 115, no. 1, pp. 2–8, 2001, https://doi.org/10.1016/S0924-0136(01)00756-7.Search in Google Scholar
[4] M. Peters, J. Kumpfert, C. H. Ward, and C. Leyens, “Titanium alloys for aerospace applications,” Adv. Eng. Mater., vol. 5, no. 6, pp. 419–427, 2003, https://doi.org/10.1002/adem.200310095.Search in Google Scholar
[5] T. Dursun and C. Soutis, “Recent developments in advanced aircraft aluminium alloys,” Mater. Des. (1980-2015), vol. 56, pp. 862–871, 2014, https://doi.org/10.1016/j.matdes.2013.12.002.Search in Google Scholar
[6] F. Appel, J. D. H. Paul, and M. Oehring, Gamma Titanium Aluminide Alloys: Science and Technology, Weinheim, Germany, Wiley, 2012.10.1002/9783527636204Search in Google Scholar
[7] Y. Ma, D. Cuiuri, N. Hoye, H. Li, and Z. Pan, “The effect of location on the microstructure and mechanical properties of titanium aluminides produced by additive layer manufacturing using in-situ alloying and gas tungsten arc welding,” Mater. Sci. Eng. A, vol. 631, pp. 230–240, 2015, https://doi.org/10.1016/j.msea.2015.02.051.Search in Google Scholar
[8] X. Wu, “Review of alloy and process development of TiAl alloys,” Intermetallics, vol. 14, nos. 10–11, pp. 1114–1122, 2006, https://doi.org/10.1016/j.intermet.2005.10.019.Search in Google Scholar
[9] B. P. Bewlay, M. Weimer, T. Kelly, A. Suzuki, and P. R. Subramanian, “The science, technology, and implementation of TiAl alloys in commercial aircraft engines,” MRS Proc., vol. 1516, pp. 49–58, 2013, https://doi.org/10.1557/opl.2013.44.Search in Google Scholar
[10] D. Kotzem, T. Arold, T. Niendorf, and F. Walther, “Influence of specimen position on the build platform on the mechanical properties of as-built direct aged electron beam melted Inconel 718 alloy,” Mater. Sci. Eng.: A, vol. 772, no. 138785, 2020, https://doi.org/10.1016/j.msea.2019.138785.Search in Google Scholar
[11] N. Wegner, D. Kotzem, Y. Wessarges, et al.., “Corrosion and corrosion fatigue properties of additively manufactured magnesium alloy WE43 in comparison to titanium alloy Ti-6Al-4V in physiological environment,” Materials, vol. 12, no. 18, pp. 1–24, 2019, https://doi.org/10.3390/ma12182892.Search in Google Scholar PubMed PubMed Central
[12] C. Körner, “Additive manufacturing of metallic components by selective electron beam melting — a review,” Int. Mater. Rev., vol. 61, no. 5, pp. 361–377, 2016, https://doi.org/10.1080/09506608.2016.1176289.Search in Google Scholar
[13] L. E. Murr, S. M. Gaytan, A. Ceylan, et al.., “Characterization of titanium aluminide alloy components fabricated by additive manufacturing using electron beam melting,” Acta Mater., vol. 58, no. 5, pp. 1887–1894, 2010, https://doi.org/10.1016/j.actamat.2009.11.032.Search in Google Scholar
[14] J. Schwerdtfeger and C. Körner, “Selective electron beam melting of Ti–48Al–2Nb–2Cr: microstructure and aluminium loss,” Intermetallics, vol. 49, pp. 29–35, 2014, https://doi.org/10.1016/j.intermet.2014.01.004.Search in Google Scholar
[15] M. Todai, T. Nakano, T. Liu, et al.., “Effect of building direction on the microstructure and tensile properties of Ti-48Al-2Cr-2Nb alloy additively manufactured by electron beam melting,” Addit. Manuf., vol. 13, pp. 61–70, 2017, https://doi.org/10.1016/j.addma.2016.11.001.Search in Google Scholar
[16] V. Juechter and C. Körner, “Creep properties of Ti-48Al-2Cr-2Nb produced by selective electron beam melting,” Key Eng. Mater., vol. 704, pp. 190–196, 2016, https://doi.org/10.4028/www.scientific.net/KEM.704.190.Search in Google Scholar
[17] V. Juechter, Fundamentals of Selective Electron Beam Melting of Titanium Aluminides, Doctoral thesis, University Erlangen-Nuremberg, Germany, 2019 (in German).Search in Google Scholar
[18] V. Juechter, M. M. Franke, T. Merenda, A. Stich, C. Körner, and R. F. Singer, “Additive manufacturing of Ti-45Al-4Nb-C by selective electron beam melting for automotive applications,” Addit. Manuf., vol. 22, pp. 118–126, 2018, https://doi.org/10.1016/j.addma.2018.05.008.Search in Google Scholar
[19] S.-J. Youn, Y.-K. Kim, S.-W. Kim, and K.-A. Lee, “Elevated temperature compressive deformation behaviors of γ-TiAl-based Ti–48Al–2Cr–2Nb alloy additively manufactured by electron beam melting,” Intermetallics, vol. 124, no. 106859, 2020, https://doi.org/10.1016/j.intermet.2020.106859.Search in Google Scholar
[20] Y.-K. Kim, S.-J. Youn, S.-W. Kim, J. Hong, and K.-A. Lee, “High-temperature creep behavior of gamma Ti-48Al-2Cr-2Nb alloy additively manufactured by electron beam melting,” Mater. Sci. Eng.: A, vol. 763, p. 138138, 2019, https://doi.org/10.1016/j.msea.2019.138138.Search in Google Scholar
[21] S. Biamino, A. Penna, U. Ackelid, et al.., “Electron beam melting of Ti–48Al–2Cr–2Nb alloy: microstructure and mechanical properties investigation,” Intermetallics, vol. 19, no. 6, pp. 776–781, 2011, https://doi.org/10.1016/j.intermet.2010.11.017.Search in Google Scholar
[22] M. Awd, F. Stern, A. Kampmann, D. Kotzem, J. Tenkamp, and F. Walther, “Microstructural characterization of the anisotropy and cyclic deformation behavior of selective laser melted AlSi10Mg structures,” Metals, vol. 8, no. 10, pp. 1–14, 2018, https://doi.org/10.3390/met8100825.Search in Google Scholar
[23] G. Ziółkowski, E. Chlebus, P. Szymczyk, and J. Kurzac, “Application of X-ray CT method for discontinuity and porosity detection in 316L stainless steel parts produced with SLM technology,” Arch. Civil Mech. Eng., vol. 14, no. 4, pp. 608–614, 2014, https://doi.org/10.1016/j.acme.2014.02.003.Search in Google Scholar
[24] Metallic Materials – Vickers Hardness Test, DIN Standard No. 6507, 2018, Beuth, Berlin, Germany, German Institute for Standardization.Search in Google Scholar
[25] D. Kotzem, L. Beermann, M. Awd, and F. Walther, “Mechanical and microstructural characterization of arc-welded Inconel 625 alloy,” Materials, vol. 12, no. 22, pp. 1–10, 2019, https://doi.org/10.3390/ma12223690.Search in Google Scholar PubMed PubMed Central
[26] C. Doñate-Buendía, F. Frömel, M. B. Wilms, et al.., “Oxide dispersion-strengthened alloys generated by laser metal deposition of laser-generated nanoparticle-metal powder composites,” Mater. Des., vol. 154, pp. 360–369, 2018, https://doi.org/10.1016/j.matdes.2018.05.044.Search in Google Scholar
[27] DIN 50106 – Testing of Metallic Materials – Compression Test at Room Temperature, 2016, Berlin, German Institute for Standardization.Search in Google Scholar
[28] M. Seifi, A. A. Salem, D. P. Satko, U. Ackelid, S. L. Semiatin, and J. J. Lewandowski, “Effects of HIP on microstructural heterogeneity, defect distribution and mechanical properties of additively manufactured EBM Ti-48Al-2Cr-2Nb,” J. Alloys Compd., vol. 729, pp. 1118–1135, 2017, https://doi.org/10.1016/j.jallcom.2017.09.163.Search in Google Scholar
[29] M. Seifi, A. Salem, D. Satko, J. Shaffer, and J. J. Lewandowski, “Defect distribution and microstructure heterogeneity effects on fracture resistance and fatigue behavior of EBM Ti–6Al–4V,” Int. J. Fatigue, vol. 94, pp. 263–287, 2017, https://doi.org/10.1016/j.ijfatigue.2016.06.001.Search in Google Scholar
[30] C. Rehse, C. Michaelis, and R. Bähr, “Computer tomography determined porosity and its effect on the strength properties of Al casting alloys,” Giesserei, vol. 103, no. 5, pp. 16–24, 2016 (in German).Search in Google Scholar
[31] Y. Ma, D. Cuiuri, N. Hoye, H. Li, and Z. Pan, “The effect of location on the microstructure and mechanical properties of titanium aluminides produced by additive layer manufacturing using in-situ alloying and gas tungsten arc welding,” Mater. Sci. Eng.: A, vol. 631, pp. 230–240, 2015, https://doi.org/10.1016/j.msea.2015.02.051.Search in Google Scholar
[32] P. Schallow and H.-J. Christ, “High-temperature fatigue behaviour of a second generation near-γ titanium aluminide sheet material under isothermal and thermomechanical conditions,” Int. J. Fatigue, vol. 53, pp. 15–25, 2013, https://doi.org/10.1016/j.ijfatigue.2011.09.006.Search in Google Scholar
© 2022 Walter de Gruyter GmbH, Berlin/Boston
Articles in the same Issue
- Frontmatter
- Experimental and dynamic thermal numerical investigation of a climate test chamber
- Influence of high-temperature, high-pressure, and acidic conditions on the structure and properties of high-performance organic fibers
- Microstructure analysis and mechanical properties of electron beam powder bed fusion (PBF-EB)-manufactured γ-titanium aluminide (TiAl) at elevated temperatures
- Microstructural evolution and impression creep properties of a lead-based alloy PbSn16Sb16Cu2
- Laser and TIG welding of additive manufactured Ti-6Al-4V parts
- Investigation of the hydrogen embrittlement susceptibility of steel components during thin-film hot-dip galvanizing
- Effects of coating, holding force, stretching height, yield stress, and surface roughness on springback of steel in the V-stretch bending test
- Gradient-based optimizer for economic optimization of engineering problems
- Failure investigation of a spline half-shaft in a loader rickshaw differential system
- Manta ray foraging optimization algorithm and hybrid Taguchi salp swarm-Nelder–Mead algorithm for the structural design of engineering components
- Effect of tool rotational speed and position on mechanical and microstructural properties of friction stir welded dissimilar alloys AZ31B Mg and Al6061
- Effect of different joint angles on the mechanical strength of adhesive-bonded scarf and double butt–lap joints
- Buckling behavior of laminated composites with embedded delaminations
- Comparison of pull-out behavior of glass, basalt, and carbon rovings embedded in fine-grain concrete and geopolymer
Articles in the same Issue
- Frontmatter
- Experimental and dynamic thermal numerical investigation of a climate test chamber
- Influence of high-temperature, high-pressure, and acidic conditions on the structure and properties of high-performance organic fibers
- Microstructure analysis and mechanical properties of electron beam powder bed fusion (PBF-EB)-manufactured γ-titanium aluminide (TiAl) at elevated temperatures
- Microstructural evolution and impression creep properties of a lead-based alloy PbSn16Sb16Cu2
- Laser and TIG welding of additive manufactured Ti-6Al-4V parts
- Investigation of the hydrogen embrittlement susceptibility of steel components during thin-film hot-dip galvanizing
- Effects of coating, holding force, stretching height, yield stress, and surface roughness on springback of steel in the V-stretch bending test
- Gradient-based optimizer for economic optimization of engineering problems
- Failure investigation of a spline half-shaft in a loader rickshaw differential system
- Manta ray foraging optimization algorithm and hybrid Taguchi salp swarm-Nelder–Mead algorithm for the structural design of engineering components
- Effect of tool rotational speed and position on mechanical and microstructural properties of friction stir welded dissimilar alloys AZ31B Mg and Al6061
- Effect of different joint angles on the mechanical strength of adhesive-bonded scarf and double butt–lap joints
- Buckling behavior of laminated composites with embedded delaminations
- Comparison of pull-out behavior of glass, basalt, and carbon rovings embedded in fine-grain concrete and geopolymer
