Abstract
Chemical and X-ray examinations were made on phosphides isolated electrolytically from Fe-2.5%P-M ternary alloys, in order to clarify the phase-relationships between phosphide-phases and iron-phase in Fe-P-M systems, and also to determine the phosphide-forming tendency of alloying elements in steel.
It was observed that Ni, Co, Si, Al, W and Mn would have a weak tendency to combine with phosphorus in steel, because any phosphide phases except Fe3P were not found in ternary systems, Fe-P-Ni, Fe-P-Co, Fe-P-Si, Fe-P-Al, Fe-P-W and Fe-P-Mn. On the other hand, special phosphides, FeMoP, FeNbP, FeTiP, FeZrP, Fe4ZrP2, V2P and Cr2P were found in ternary systems containing Mo, Nb, Ti, Zr, V and Cr, respectively. This means that these elements would have a strong phosphide forming tendency in steel.
