Article Improving the Dimensional Stability and Mechanical Properties of AISI 316L + B Sinters by Si3N4 Addition

Research output: Contribution to journalArticleResearchpeer-review

Abstract

The following paper describes a new and eective method to obtain high-density sinters
with simultaneously decreased distortions, produced by one press and sinter operation. This eect
was achieved through the induced disappearance of the eutectic liquid phase. The study was carried
out on AISI 316L stainless steel powder that was mixed with elemental boron and silicon nitride.
Boron was used as a sintering process activator. The scientific novelty of this publication consists of
the use of a silicon nitride as a solid-state nitrogen carrier that was intended to change the borides’
morphology by binding boron. Based on the thermodynamic calculations, 20 blends of various
compositions were tested for physical properties, porosity, microstructure, and mechanical properties.
Moreover, phase compositions for selected samples were analyzed. It was shown that the addition
of silicon nitride as a nitrogen carrier decreases the boron-based eutectic phase volume and both
increases the mechanical properties and decreases after-sintering distortions. An explanation of the
observed phenomena was also proposed.
Original languageEnglish
Article number1798
Number of pages15
JournalMaterials
Volume12
Issue number11
DOIs
Publication statusPublished - 3 Jun 2019

Fingerprint

Boron
Dimensional stability
Silicon nitride
Mechanical properties
Eutectics
Nitrogen
Sintering
Boron nitride
Stainless Steel
Phase composition
Powders
Stainless steel
Physical properties
Porosity
Thermodynamics
Microstructure
Liquids
silicon nitride

Keywords

  • boron
  • 316L
  • silicon nitride
  • shape distortion
  • liquid phase sintering
  • mechanical properties

Cite this

Article Improving the Dimensional Stability and Mechanical Properties of AISI 316L + B Sinters by Si3N4 Addition. / Skalon, Mateusz; Buzolin, Ricardo Henrique; Kazior, Jan; Sommitsch, Christoph; Hebda, Marek .

In: Materials, Vol. 12, No. 11, 1798, 03.06.2019.

Research output: Contribution to journalArticleResearchpeer-review

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AU - Sommitsch, Christoph

AU - Hebda, Marek

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AB - The following paper describes a new and eective method to obtain high-density sinterswith simultaneously decreased distortions, produced by one press and sinter operation. This eectwas achieved through the induced disappearance of the eutectic liquid phase. The study was carriedout on AISI 316L stainless steel powder that was mixed with elemental boron and silicon nitride.Boron was used as a sintering process activator. The scientific novelty of this publication consists ofthe use of a silicon nitride as a solid-state nitrogen carrier that was intended to change the borides’morphology by binding boron. Based on the thermodynamic calculations, 20 blends of variouscompositions were tested for physical properties, porosity, microstructure, and mechanical properties.Moreover, phase compositions for selected samples were analyzed. It was shown that the additionof silicon nitride as a nitrogen carrier decreases the boron-based eutectic phase volume and bothincreases the mechanical properties and decreases after-sintering distortions. An explanation of theobserved phenomena was also proposed.

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