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Formation Of Carbide Shells And Cavities From Cr Particles During Sintering Of Mixed Fe-Cr-C Steels

  • : Raquel de Oro Calderon1, Christian Gierl-Mayer1, Herbert Danninger1
  • : 1TU Wien
  • : PDF Download
  • : 2016

Abstract

Cr alloyed sintered steels offer attractive properties at moderate alloying cost compared to conventional Cu and/or Ni alloyed variants. In parallel to prealloyed steels, also mixed grades are attractive since they offer wider compositional flexibility. In the present work, the sintering and homogenization behaviour of Cr alloyed steels has been studied using coarse Cr powders, to more clearly reveal the stages of the homogenization process. It showed that in intermediate stages of heating, relatively thick carbide shells are formed around the Cr particles that consist of (Cr,Fe) carbide, and the core of the particles tends to become increasingly hollow, indicating preferential outward diffusion of Cr through the carbide rather than diffusion of Fe inward. This further promotes formation of secondary pores during subsequent transient liquid phase sintering at around 1370°C. In inert atmospheres, the formation of these carbide shells causes the enclosure of oxides on the surface of the Cr-particles

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