| A mathematical model was developed in order to study the influence of alloying elements on the compressibility and sinter hardenability of steel powders. The alloying elements which were considered are manganese, chromium, molybdenum and nickel. These elements have specific effects on compressibility and hardenability. This model enabled the selection of fewer experimental compositions as to limit plant trials. The chosen powders were then elaborated in the plant (atomization, milling of the cast iron shot and decarburization with two types of mill scale) and in the laboratory (decarburization with gases and mill scale and milling of the finished powders). Six experimental compositions were chosen for this study (MP57, SpMn, 31HC, 31KLM, MP51FM and 31K) as well as six industrial powders (MP35, MP52, MP55, MP58FM, 737SH and PMA350).;The sinter hardenability of the powders was evaluated with an experimental setup, which enabled to simulate the typical post-sintering cooling rates achieved in industrial furnaces.;Ternary Fe-Cu-Ni powders were also elaborated and admixed to steel powders in order to enhance their sinter hardenability and avoid the decrease in compressibility associated to solid solution hardening. (Abstract shortened by UMI.). |
