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Influence of Sintering Parameters on the Properties of a Superaustenitic Stainless Steel

  • : Menapace, C1
  • : 1University of Trento
  • : PDF Download
  • : 2012

Abstract

A superaustenitic stainless steel containing 20%Cr, 19%Ni and 6,3%Mo has been sintered in a vacuum furnace varying sintering parameters as temperature, time and atmosphere in order to get the best combination of mechanical properties and corrosion resistance. Sintering was carried out in vacuum and in vacuum followed by a backfilling with N2, changing temperature in the range 1250-1350�C and time between 30 min and 2 h. The influence of these process parameters was evaluated on: final density, microstructure, mechanical properties and corrosion behaviour. It was seen that while sintering in N2 suppresses the formation of sigma phase, sintering in vacuum leads to a higher densification due to the formation of ? ferrite at high temperature. A post-sintering solutionizing treatment is required to eliminate sigma phase in specimens sintered in vacuum. If a residual open porosity is present the influence of sigma phase on corrosion resistance is not relevant.
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