Glass forming ability and soft-magnetic properties of Fe-based glassy alloys developed using high phosphorous pig Iron

Glass forming ability (GFA) and soft-magnetic behaviour of melt-spun Fe69C5.5P11.5Mn0.4Si2.3Cr1.8Mo1B8.5
(alloy 2) and Fe68C9P12Mn1Si3Nb2B5, (alloy 3) alloys prepared using high phosphorous pig iron (h-PI,
Fe80C14P2.2Mn0.4Si3.4) has been studied. The glass formation, thermo-physical and soft-magnetic properties
of the alloys were analyzed for different quenching rates by varying wheel speed as 23, 26, 33, 39
and 43 m/s. The simultaneous incorporation of alloying elements (Cr, Mo, Nb) and metalloids (C, B, P, Si)
transforms h-PI to complete glassy alloy, even at low quenching rates. The melt quenching rate influences
the thermal parameters and Curie temperature of glassy ribbons in an opposite way. Amongst
all, FeCPMnSiCrMoB glassy alloy show superior combination of higher glass transition temperature of
788 K, super cooled region of 34 K, glass Curie temperature of 552 K, coercivity less than 13 A/m and
maximum saturation magnetization of 1.1 T. In addition, the annealing treatment at 758 K improves
magnetic softness (1.7 A/m) of the alloy by relaxation of quenched-in stresses. The comparison of
developed glassy alloy with similar Fe-glassy alloys and SENNTIX type alloys show best combination of
thermo-physical and magnetic properties. The glassy alloy prepared using blast furnace high phosphorous
pig iron can be used for uniformly gapped soft-magnetic cores.