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Sintering and Joining of Tungsten Carbide Powder with Steel by High Voltage Consolidation Method

  • : Grigoryev, E1
  • : 1Moscow Engineering Physics Institute
  • : PDF Download
  • : 2012

Abstract

High voltage consolidation (HVC) and simultaneous joining of tungsten carbide cobalt powder layer to steel substrate is a very promising method of manufacturing stamping and cutting tools. This method uses the passage of the high-voltage pulse electric current to provide the resistive heating of the powder by the Joule effect. Joule heating occurs at the inter-particle contacts to instantaneously weld powder particles, resulting in densification and bonding to the steel substrate. The most important factor which determines the success of the HVC process is the current density amplitude in the powder specimen. This paper studies the influence of the pulse current density on the electric discharge consolidation and joining of the tungsten carbide ? cobalt composite with steel, using optical metallography and high-resolution scanning electron microscopy. Microstructure analysis confirmed the preservation of the original grain size of tungsten carbide and lack of porosity on the contact surface between the cemented carbide layer and the steel substrate.
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