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- Title
Microstructural evolution during sintering of Fe-Cr-C steels prepared from admixed elemental powders.
- Authors
de Oro Calderon, Raquel; Gierl-Mayer, Christian; Danninger, Herbert
- Abstract
In the upcoming years, a reduction in the use of critical elements, such as Ni and Cu, with unstable prices and high demand from the electromobility sector will become increasingly important for the PM-industry. Cr-alloyed sintered steels offer attractive properties at a moderate cost, but so far mostly Cr-prealloyed grades have been used. This work analyses the microstructural homogenisation process when Cr is introduced as admixed elemental powder. It is shown how – due to its high carbon affinity – Cr particles act as 'internal carbon-getters'. There is an intermediate 'heterogenization' of the microstructure, i.e. the iron matrix is decarburised due to the formation of (Cr, Fe)-carbides. Final homogenisation depends on the formation of a transient liquid phase through the eutectic reaction between carbides and the iron matrix. Thus, the microstructure is not only sensitive to aspects such as sintering temperature or Cr-particle size but also to the heating rate and small variations in nominal carbon.
- Subjects
CEMENTITE; COPPER; POWDERS; EUTECTIC reactions; IRON; STEEL
- Publication
Powder Metallurgy, 2023, Vol 66, Issue 5, p450
- ISSN
0032-5899
- Publication type
Article
- DOI
10.1080/00325899.2023.2201487