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Process investigation and mechanical properties of electro sinter forged (ESF) titanium discs

  • Emanuele Cannella
  • Chris Valentin NielsenEmail author
  • Niels Bay
ORIGINAL ARTICLE
  • 86 Downloads

Abstract

Classified as an electric current–assisted sintering (ECAS) process, electro sinter forging (ESF) represents a sintering process following the resistance heating approach. The powder is simultaneously compacted and heated in a closed-die setup. The heating is generated by the Joule effect from the electrical current. Near net shape components of conductive materials are made in the closed-die setup within a short process time (100–400 ms). The final relative density is an important quality measure for the sintered parts. In the present work, samples of commercially pure titanium are produced with up to 98% relative density by optimisation of the main process parameters, namely electrical current density, compaction pressure and sintering time. Metallographic observations revealed that porosities were mostly found at the perimeter of the sintered samples. Mechanical testing by μ-Vickers hardness test, uniaxial compression and indirect tensile tests showed improved properties of the material with increasing density. The achieved mechanical properties were compatible with the theoretical values for bulk titanium.

Keywords

Electro sinter forging Resistance sintering Metal powder Titanium Metallography Mechanical tests 

Abbreviations

ASTM

American Society for Testing and Materials International

bcc

Body-centred cubic

BSD

Backscattered detector

ECAS

Electric current–assisted sintering

ESF

Electro sinter forging

FAST

Field-assisted sintering technology

GUM

Guide to the expression of uncertainty in measurement

hcc

Hexagonal close-packed

HP

Hot pressing

HV

Hardness Vickers

IDT

Indirect tensile test

ISO

International Organization for Standardization

LOM

Light optical microscopy

MFDC

Middle-frequency direct current

SEM

Scanning electron microscope

SPS

Spark plasma sintering

Notes

Acknowledgements

This research work was undertaken in the context of MICROMAN project (“Process Fingerprint for Zerodefect Net-shape MICROMANufacturing”, http://www.microman.mek.dtu.dk/). MICROMAN is a European Training Network supported by Horizon 2020, the EU Framework Programme for Research and Innovation (Project ID: 674801).

References

  1. 1.
    Castro RHR (2013) Sintering. Springer Berlin Heidelberg, BerlinCrossRefGoogle Scholar
  2. 2.
    Atkinson HV, Davies S (2000) Fundamental aspects of hot isostatic pressing: an overview. Metall Mater Trans A Phys Metall Mater Sci 31:2981–3000.  https://doi.org/10.1007/s11661-000-0078-2 CrossRefGoogle Scholar
  3. 3.
    Bhandhubanyong P, Akhadejdamrong T (1997) Forming of silicon nitride by the HIP process. J Mater Process Technol 63:277–280.  https://doi.org/10.1016/S0924-0136(96)02635-0 CrossRefGoogle Scholar
  4. 4.
    Kessel HU, Hennicke J, Schmidt J, et al (2008) “FAST” field assisted sintering technology- a new process for the production of metallic and ceramic sintering materialsGoogle Scholar
  5. 5.
    Grasso S, Sakka Y, Maizza G (2009) Electric current activated/assisted sintering ( ECAS ): a review of patents 1906–2008. Sci Technol Adv Mater 10:053001.  https://doi.org/10.1088/1468-6996/10/5/053001 CrossRefGoogle Scholar
  6. 6.
    Anselmi-Tamburini U, Groza JR (2017) Critical assessment: electrical field/current application–a revolution in materials processing/sintering? Mater Sci Technol (United Kingdom) 33:1855–1862.  https://doi.org/10.1080/02670836.2017.1341692 CrossRefGoogle Scholar
  7. 7.
    Hitchcock D, Livingston R, Liebenberg D (2015) Improved understanding of the spark plasma sintering process. J Appl Phys 117:1–6.  https://doi.org/10.1063/1.4919814 CrossRefGoogle Scholar
  8. 8.
    Guillon O, Gonzalez-Julian J, Dargatz B, Kessel T, Schierning G, Räthel J, Herrmann M (2014) Field-assisted sintering technology/spark plasma sintering: mechanisms, materials, and technology developments. Adv Eng Mater 16:830–849.  https://doi.org/10.1002/adem.201300409 CrossRefGoogle Scholar
  9. 9.
    Dong Z, Zhang J, Li S et al (2015) Sintering and densification (I)—conventional sintering technologies. Opt Mater:291–394Google Scholar
  10. 10.
    Vanmeensel K, Laptev A, Huang SG et al (2012) The role of the electric current and field during pulsed electric current sintering. In: Ceramics and composites processing methods. Wiley, Hoboken, pp 43–73CrossRefGoogle Scholar
  11. 11.
    Bonifacio CS, Holland TB, van Benthem K (2013) Evidence of surface cleaning during electric field assisted sintering. Scr Mater 69:769–772.  https://doi.org/10.1016/j.scriptamat.2013.08.018 CrossRefGoogle Scholar
  12. 12.
    Yurlova MS, Demenyuk VD, Lebedeva LY, Dudina DV, Grigoryev EG, Olevsky EA (2014) Electric pulse consolidation: an alternative to spark plasma sintering. J Mater Sci 49:952–985.  https://doi.org/10.1007/s10853-013-7805-8 CrossRefGoogle Scholar
  13. 13.
    Fais A (2010) Processing characteristics and parameters in capacitor discharge sintering. J Mater Process Technol 210:2223–2230.  https://doi.org/10.1016/j.jmatprotec.2010.08.009 CrossRefGoogle Scholar
  14. 14.
    Forno I, Actis Grande M, Fais A (2015) On the application of electro-sinter-forging to the sintering of high-karatage gold powders. Gold Bull 48:127–133.  https://doi.org/10.1007/s13404-015-0169-x CrossRefGoogle Scholar
  15. 15.
    Fais A, Leoni M, Scardi P (2012) Fast sintering of nanocrystalline copper. Metall Mater Trans A 43:1517–1521.  https://doi.org/10.1007/s11661-011-0727-7 CrossRefGoogle Scholar
  16. 16.
    Fais A, Actis Grande M, Forno I (2016) Influence of processing parameters on the mechanical properties of electro-sinter-forged iron based powders. Mater Des 93:458–466.  https://doi.org/10.1016/j.matdes.2015.12.142 CrossRefGoogle Scholar
  17. 17.
    Lagos MA, Agote I, Schubert T, Weissgaerber T, Gallardo JM, Montes JM, Prakash L, Andreouli C, Oikonomou V, Lopez D, Calero JA (2017) Development of electric resistance sintering process for the fabrication of hard metals: processing, microstructure and mechanical properties. Int J Refract Met Hard Mater 66:88–94.  https://doi.org/10.1016/j.ijrmhm.2017.03.005 CrossRefGoogle Scholar
  18. 18.
    Montes JM, Rodríguez JA, Cuevas FG, Cintas J (2011) Consolidation by electrical resistance sintering of Ti powder. J Mater Sci 46:5197–5207.  https://doi.org/10.1007/s10853-011-5456-1 CrossRefGoogle Scholar
  19. 19.
    Yu M, Grasso S, Mckinnon R, Saunders T, Reece MJ (2017) Review of flash sintering: materials, mechanisms and modelling. Adv Appl Ceram 116:24–60.  https://doi.org/10.1080/17436753.2016.1251051 CrossRefGoogle Scholar
  20. 20.
    Grigoryev EG, Olevsky EA (2012) Thermal processes during high-voltage electric discharge consolidation of powder materials. Scr Mater 66:662–665.  https://doi.org/10.1016/j.scriptamat.2012.01.035 CrossRefGoogle Scholar
  21. 21.
    Solimanjad N, Larsson M (2005) Tribological properties of lubricants used in PM process. In: Euro Pm 2005: powder metallurgy congress and exhibition. European Powder Metallurgy Association (EPMA), Shrewsbury, pp 123–131Google Scholar
  22. 22.
    Cannella E, Nielsen CV (2018) Lubricant influence on the ejection and roughness of in-die electro sinter forged Ti-discs. Key Eng Mater 767:171–178.  https://doi.org/10.4028/www.scientific.net/KEM.767.171 CrossRefGoogle Scholar
  23. 23.
    Cannella E, Nielsen CV, Bay N (2018) Process parameter influence on electro-sinter-forging (ESF) of titanium discs. In: 18th Int. Conf. EUr. Soc. Precis. Eng. Nanotechnology, EUSPEN 2018. euspen, pp 315–316Google Scholar
  24. 24.
    ASTM International (2013) Standard test methods for density of compacted or sintered powder metallurgy (PM) products using Archimedes’ principle. Astm B962-13(i):1–7.  https://doi.org/10.1520/B0962-13.2 CrossRefGoogle Scholar
  25. 25.
    Fais A (2018) A faster FAST: electro-sinter-forging. Met Powder Rep 73:80–86.  https://doi.org/10.1016/j.mprp.2017.06.001 CrossRefGoogle Scholar
  26. 26.
    Montes JM, Cuevas FG, Cintas J, Urban P (2011) Electrical conductivity of metal powders under pressure. Appl Phys A Mater Sci Process 105:935–947.  https://doi.org/10.1007/s00339-011-6515-9 CrossRefGoogle Scholar
  27. 27.
    ISO/IEC (2008) Guide 98-3: 2008 uncertainty of measurement -- part 3: guide to the expression of uncertainty in measurement (GUM:1995). https://www.iso.org/standard/50461.html. Accessed 5 May 2017
  28. 28.
    Gammon LM, Briggs RD, Packard JM et al (2004) Metallography and microstructures of titanium and its alloys. Mater Park OH ASM Int 9:899–917.  https://doi.org/10.1361/asmhba0003779 CrossRefGoogle Scholar
  29. 29.
    Yan M, Luo SD, Schaffer GB, Qian M (2013) Impurity (Fe, Cl, and P)-induced grain boundary and secondary phases in commercially pure titanium (CP-Ti). Metall Mater Trans A Phys Metall Mater Sci 44:3961–3969.  https://doi.org/10.1007/s11661-013-1720-0 CrossRefGoogle Scholar
  30. 30.
    Olevsky EA, Dudina DV (2018) Resistance Sintering. In: Resistance sintering. Springer International Publishing, ChamCrossRefGoogle Scholar
  31. 31.
    Höganäs AB (2013) Production of sintered components. Höganäs AB 1:170Google Scholar
  32. 32.
    Montes JM, Cuevas FG, Cintas J (2011) Electrical resistivity of a titanium powder mass. Granul Matter 13:439–446.  https://doi.org/10.1007/s10035-010-0246-z CrossRefGoogle Scholar
  33. 33.
  34. 34.
    ISO (2018) BS EN 6507-1:2018 - Metallic materials — Vickers hardness test — Part 1: test method. https://www.iso.org/obp/ui/#iso:std:iso:6507:-1:ed-4:v1:en. Accessed 20 Jan 2018
  35. 35.
    Firm K, Boyer R, Welsch G (1994) Materials properties handbook: titanium alloysGoogle Scholar
  36. 36.
    Poondla N, Srivatsan TS, Patnaik A, Petraroli M (2009) A study of the microstructure and hardness of two titanium alloys: commercially pure and Ti-6Al-4V. J Alloys Compd 486:162–167.  https://doi.org/10.1016/j.jallcom.2009.06.172 CrossRefGoogle Scholar
  37. 37.
    Khodabakhshi F, Haghshenas M, Eskandari H, Koohbor B (2015) Hardness-strength relationships in fine and ultra-fine grained metals processed through constrained groove pressing. Mater Sci Eng A 636:331–339.  https://doi.org/10.1016/j.msea.2015.03.122 CrossRefGoogle Scholar
  38. 38.
    Dieter GE, Bacon D, George Ellwood Dieter DB (1988) Mechanical metallurgyGoogle Scholar
  39. 39.
    Fahad MK (1996) Stresses and failure in the diametral compression test. J Mater Sci 31:3723–3729.  https://doi.org/10.1007/BF00352786 CrossRefGoogle Scholar
  40. 40.
    Procopio AT, Zavaliangos A, Cunningham JC (2003) Analysis of the diametrical compression test and the applicability to plastically deforming materials. J Mater Sci 38:3629–3639.  https://doi.org/10.1023/A:1025681432260 CrossRefGoogle Scholar

Copyright information

© Springer-Verlag London Ltd., part of Springer Nature 2019

Authors and Affiliations

  1. 1.Department of Mechanical EngineeringTechnical University of DenmarkKgs. LyngbyDenmark
  2. 2.IPUKgs. LyngbyDenmark

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