Phase Transformation and Properties of Fe-Cr-Co Alloys with Low Cobalt Content

Abstract

The Curie temperature, phase transformation, microstructure and magnetic properties of Fe-10Cr-xCo alloys with low Cobalt content were analyzed after casted and solid solution quenched, respectively. The results show that the experimental Curie temperature increases from 1043 K to 1065 K with differential Co content addition, and which is about 50 K higher (as can be called “the degree of superheat”) compared with the calculated data. Besides, addition of Co promotes the formation of α-ferrite phase, and thus leads to the decrease of Vickers hardness. According to X-ray diffraction results, B2 type ordered structure forms, and Cr_1.07Fe_18.93 was observed in all the samples, whereas, CoFe_15.7 only can be found in the sample with the addition of Co is more than 2 mass%.