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

Emanuele Cannella, Chris Valentin Nielsen*, Niels Bay

*Corresponding author for this work

    Research output: Contribution to journalJournal articleResearchpeer-review

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    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.
    Original languageEnglish
    JournalInternational Journal of Advanced Manufacturing Technology
    Volume104
    Issue number5-8
    Pages (from-to)1985–1998
    ISSN1433-3015
    DOIs
    Publication statusPublished - 2019

    Keywords

    • Electro sinter forging
    • Resistance sintering
    • Metal powder
    • Titanium
    • Metallography
    • Mechanical tests

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