Authors:
Herbert Danninger (Technische Universität Wien, Austria),
Milad Hojati (Technische Universität Wien, Austria),
Thomas Konegger (Technische Universität Wien, Austria),
Christian Gierl-Mayer (Technische Universität Wien, Austria)
Abstract:
Sintered steel parts contain porosity which at the usual density levels is predominantly interconnected and open. This affects secondary treatments such as carburizing or infiltration. The volume fraction of the open pores can be determined by He pycnometry, but also the pore diameter is relevant. In the present study, the pore diameter has been determined by Hg porosimetry on a plain carbon steel and a Cr-Mo prealloyed grade. Since the pore channels in PM steels are complex-shaped, different measures for the diameter were determined, the median, average and modal diameter. It showed that although these parameters differ for a given material, the more, the lower the density, in all cases there is a virtually linear correlation with the sintered density that holds for both sintered steel grades, indicating that at least for materials solid state sintered under defined conditions the density is the main factor determining the pore diameter.
DOI:
https://doi.org/10.59499/WP225368092