Mechanism of sintering

✍ Scribed by W.D. Jones

• Publisher: Elsevier Science
• Year: 1959
• Weight: 333 KB
• Volume: 7
• Category: Article
• ISSN: 0001-6160
• DOI: 10.1016/0001-6160(59)90081-1

✦ Synopsis

FIG. 2. Precipitate type (h).

x 28000.

cent of phosphorus, they are likely to be unsaturated with respect to this element at the quenching temperatures (700-900°C). Under these conditions one would not therefore expect to find at equilibrium precipitates of the simple iron phosphide type (in particular Fe,P), at the grain boundaries.

To conclude, our present view is that a large part of the segregated phosphorus probably exists in the form of a precipitate at the grain boundaries, and we believe that this may arise because of the presence of other solute impurities in the iron. The phase diagram which is of importance here in considerations of the equilibrium state of the alloy, is then not that which refers to iron and phosphorus alone, but that which includes also other remaining impurities in the alloy. We do not however exclude the possibility of the existence of a segregated monolayer of phosphorus at the grain boundaries,