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The effect of porosity on the mechanical properties of Ti-6Al-4V components manufactured by high-power selective laser melting

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Abstract

Metal powder bed fusion in additive manufacturing is gaining interest as a manufacturing technique for complex metal parts in the aerospace, rail, and automotive industries. This has led to an emergence of 3D printers in the market to accelerate the diffusion of this technology as an industrial manufacturing technique. The Aeroswift is an additive manufacturing machine developed with the purpose of using high laser powers for high-speed production of structurally dense parts at accelerated consolidation rates. The work in this paper focuses on the 3D printing of Ti-6Al-4V tensile specimens with the aim of determining the effect of fast cooling rate and porosity on the ductility of the specimen. The mechanical properties of the parts depend on the energy input; in order to obtain optimum melting of powder and desirable properties, an exponential decay relationship was observed where, as porosity increased, the elongation dropped. The level of porosity at low energy density is attributed to lack of fusion from low heat input, while high energy inputs showed low porosity.

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The raw/processed data required to reproduce these findings cannot be shared at this time as the data also forms part of an ongoing study.

References

  1. Haar GMT, Becker TH (2018) Selective laser melting produced Ti-6Al-4V: post-process heat treatments to achieve superior tensile properties. Materials 11:146–161

    Article  Google Scholar 

  2. Shipley H, McDonnell D, Culleton M, Coull R, Lupoi R, O'Donnell G, Trimble D (2018) Optimisation of process parameters to address fundamental challenges during selective laser melting of Ti-6Al-4V: a review. Int J Mach Tools Manuf 128:1–20

    Article  Google Scholar 

  3. Liu S, Shin YC (2019) Additive manufacturing of Ti6Al4V alloy: a review. Mater Des 164:107552

    Article  Google Scholar 

  4. Kabir MR, Richter H (2017) Modeling of Processing-induced pore morphology in an additively-manufactured Ti-6Al-4V alloy. Materials 10(2):145

    Article  Google Scholar 

  5. Promoppatum, P., et al. (2018) Numerical modeling and experimental validation of thermal history and microstructure for additive manufacturing of an Inconel 718 product. Progress in Additive Manufacturing, Numerical modeling and experimental validation of thermal history and microstructure for additive manufacturing of an Inconel 718 product.

  6. Mathe NR, Tshabalala LC (2019) The validation of the microstructural evolution of selective laser-melted AlSi10Mg on the in-house built machine: energy density studies. Progress in Additive Manufacturing 4(4):431–442

    Article  Google Scholar 

  7. Kumar KS (2014) Analytical modeling of temperature distribution, peak temperature, cooling rate and thermal cycles in a solid work piece welded by laser welding process. Procedia Mater Sci 6:821–834

    Article  Google Scholar 

  8. Background on Laser Processing, in Principles of Laser Materials Processing. p. 407-430.

  9. Shunmugavel M, Goldberg M, Polishetty A, Nomani J, Sun S, Littlefair G (2019) Chip formation characteristics of selective laser melted Ti–6Al–4V. Aust J Mech Eng 17(2):109–126

    Article  Google Scholar 

  10. Majumdar T, Bazin T, Massahud Carvalho Ribeiro E, Frith JE, Birbilis N (2019) Understanding the effects of PBF process parameter interplay on Ti-6Al-4V surface properties. PLoS One 14(8):e0221198

    Article  Google Scholar 

  11. Madikizela C, Cornish LA, Chown LH, Möller H (2019) Microstructure and mechanical properties of selective laser melted Ti-3Al-8V-6Cr-4Zr-4Mo compared to Ti-6Al-4V. Mater Sci Eng A 747:225–231

    Article  Google Scholar 

  12. Yan X, Yin S, Chen C, Huang C, Bolot R, Lupoi R, Kuang M, Ma W, Coddet C, Liao H, Liu M (2018) Effect of heat treatment on the phase transformation and mechanical properties of Ti6Al4V fabricated by selective laser melting. J Alloys Compd 764:1056–1071

    Article  Google Scholar 

  13. Mfusi BJ et al (2019) The effect of stress relief on the mechanical and fatigue properties of additively manufactured AlSi10Mg Parts. Metals 9(11):1216

    Article  Google Scholar 

  14. Zhang B, Li Y, Bai Q (2017) Defect formation mechanisms in selective laser melting: a review. Chinese Journal of Mechanical Engineering 30(3):515–527

    Article  Google Scholar 

  15. Tshabalala LC, Mathe N, Chikwanda H (2018) Characterization of gas atomized Ti-6Al-4V powders for additive manufacturing. Key Eng Mater 770:3–8

    Article  Google Scholar 

  16. Jojo N et al (2019) Thermal modelling of pulsed laser ablation of silicon nitride ceramics. in Chemistry for a Clean and Healthy Planet. Springer International Publishing, Cham

    Google Scholar 

  17. Balla VK, Bodhak S, Bose S, Bandyopadhyay A (2010) Porous tantalum structures for bone implants: fabrication, mechanical and in vitro biological properties. Acta Biomater 6(8):3349–3359

    Article  Google Scholar 

  18. Liu H, Li M, Qin X, Huang S, Hong F (2019) Numerical simulation and experimental analysis of wide-beam laser cladding. Int J Adv Manuf Technol 100(1):237–249

    Article  Google Scholar 

  19. Lütjering G (1998) Influence of processing on microstructure and mechanical properties of (α+β) titanium alloys. Mater Sci Eng A 243(1):32–45

    Article  Google Scholar 

  20. Kumar P, Chandran KSR (2017) Strength–ductility property maps of powder metallurgy (PM) Ti-6Al-4V alloy: a critical review of processing-structure-property relationships. Metall Mater Trans A 48(5):2301–2319

    Article  Google Scholar 

  21. Vrancken B, Thijs L, Kruth JP, van Humbeeck J (2012) Heat treatment of Ti6Al4V produced by selective laser melting: microstructure and mechanical properties. J Alloys Compd 541:177–185

    Article  Google Scholar 

  22. Zhao ZY, L L, Bai PK (2018) The Heat Treatment influence on the microstructure and hardness of TC4 titanium alloy manufactured via selective laser melting. Materials (Basel) 11:1318

    Article  Google Scholar 

  23. du Plessis A, Sperling P, Beerlink A, Tshabalala L, Hoosain S, Mathe N, le Roux SG (2018) Standard method for microCT-based additive manufacturing quality control 1: porosity analysis. MethodsX 5:1102–1110

    Article  Google Scholar 

  24. Zhao X, Li S, Zhang M, Liu Y, Sercombe TB, Wang S, Hao Y, Yang R, Murr LE (2016) Comparison of the microstructures and mechanical properties of Ti–6Al–4V fabricated by selective laser melting and electron beam melting. Mater Des 95:21–31

    Article  Google Scholar 

  25. Bruno J, Rochman A, Cassar G (2017) Effect of build orientation of electron beam melting on microstructure and mechanical properties of Ti-6Al-4V. J Mater Eng Perform 26(2):692–703

    Article  Google Scholar 

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Acknowledgements

The authors will like to acknowledge the Department of Science and Technology, CSIR National Laser Centre on the Aeroswift programme for funding and sample production. Stellenbosch University CT Scanner Facility and CSIR Materials Science & Manufacturing Mechanical Laboratory are also acknowledged for sample characterization.

Funding

This study was funded by the Department of Science and Innovation South Africa and CSIR South Africa.

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Authors and Affiliations

  1. Laser Enabled Manufacturing Research Group, National Laser Centre, Council for Industrial and Scientific Research, Pretoria, South Africa

    Ntombizodwa R. Mathe, Lerato C. Tshabalala, Shaik Hoosain & Londiwe Motibane

  2. CT Scanner Facility, Stellenbosch University, Stellenbosch, South Africa

    Anton du Plessis

Authors
  1. Ntombizodwa R. Mathe
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  2. Lerato C. Tshabalala
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  3. Shaik Hoosain
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  4. Londiwe Motibane
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  5. Anton du Plessis
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Contributions

Mathe (conceptualize, data analysis, writing), Tshabalala (conceptualize, data analysis, writing), Hoosain (processing, data analysis, writing), Motibane (data analysis, writing), Du Plessis (micro-CT analysis, writing)

Corresponding authors

Correspondence to Ntombizodwa R. Mathe or Lerato C. Tshabalala.

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Mathe, N.R., Tshabalala, L.C., Hoosain, S. et al. The effect of porosity on the mechanical properties of Ti-6Al-4V components manufactured by high-power selective laser melting. Int J Adv Manuf Technol 115, 3589–3597 (2021). https://doi.org/10.1007/s00170-021-07326-6

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  • DOI: https://doi.org/10.1007/s00170-021-07326-6

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