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

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 50K higher (as can be called the degree of superheat) compared with the calculated data. Besides, addition of Co promotes the formation of alpha-ferrite phase, and thus leads to the decrease of Vickers hardness. According to X-ray diffraction results, B2 type ordered structure forms, and Cr1.07Fe18.93 was observed in all the samples, whereas, CoFe15.7 only can be found in the sample with the addition of Co is more than 2 mass%.