Authors:
Milad Hojati (1), Christian Gierl-Mayer (1), Herbert Danninger (1)
1- Technische Universität Wien, Institut für Chemische Technologien und Analytik, Austria
Abstract:
Carbon is typically introduced into sintered steels through admixed fine graphite, the dissolution dur-ing sintering however being relatively slow. An alternative route would be the introduction via a car-bon-rich Fe-C powder containing carbon as cementite. In the present study it is shown that already addition of a minor proportion of carbon through atomized Fe-4.5%C masteralloy powder activates carbothermal reduction of the surface oxides, shifting the CO formation temperature to lower levels, as well as dissolution of graphite in the matrix. This is particularly noticeable in steels prepared from prealloyed steel powder Fe-3%Cr-0.5%Mo. The property most sensitive to carbon dissolution is the coercive force, which offers the chance to nondestructively characterize this important process.
DOI:
https://doi.org/10.59499/EP246206688
