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

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

Cite this

@article{b9abf3322d754dc2a2f320919eb83b2d,
title = "Process investigation and mechanical properties of electro sinter forged (ESF) titanium discs",
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",
author = "Emanuele Cannella and Nielsen, {Chris Valentin} and Niels Bay",
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pages = "1985–1998",
journal = "International Journal of Advanced Manufacturing Technology",
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Process investigation and mechanical properties of electro sinter forged (ESF) titanium discs. / Cannella, Emanuele; Nielsen, Chris Valentin; Bay, Niels.

In: International Journal of Advanced Manufacturing Technology, Vol. 104, No. 5-8, 2019, p. 1985–1998 .

Research output: Contribution to journalJournal articleResearchpeer-review

TY - JOUR

T1 - Process investigation and mechanical properties of electro sinter forged (ESF) titanium discs

AU - Cannella, Emanuele

AU - Nielsen, Chris Valentin

AU - Bay, Niels

PY - 2019

Y1 - 2019

N2 - 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.

AB - 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.

KW - Electro sinter forging

KW - Resistance sintering

KW - Metal powder

KW - Titanium

KW - Metallography

KW - Mechanical tests

U2 - 10.1007/s00170-019-03972-z

DO - 10.1007/s00170-019-03972-z

M3 - Journal article

VL - 104

SP - 1985

EP - 1998

JO - International Journal of Advanced Manufacturing Technology

JF - International Journal of Advanced Manufacturing Technology

SN - 0268-3768

IS - 5-8

ER -