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 1043K to 1065K with differential Co content addition, and which is about 50K 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 1.07 Fe 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%.