Determination of curie temperatures and thermal oxidation behavior of Fe-Cr matrix composites produced by hot pressing

Fe-Cr matrix composite alloys were produced by hot pressing (HP) method then their microstructure, mechanical, and oxidation properties were examined in detail. In composite alloys produced with Fe-Cr and Fe-Cr-C alloys, the main phases were Fe, M(Cr, Fe)7C3 phases. In addition, Fe2B/Cr7BC4 phases were formed by addition of B, and Cr, Fe and FeCr-rich regions were found in the microstructure. When the Fe-Cr alloy showed the lowest hardness (average 218 HV0.025), the hardness value was recorded as 286 HV0.025 by the addition of alloying elements. With the help of Thermal Gravimetry (TG) it was determined that the alloys exhibit two different oxidation behaviors. It was also found that the Curie temperatures of the ferromagnetic alloys in operation were decreased with the addition of B to the FeCr alloy. •Fe-Cr, Fe-Cr-C, and Fe-Cr-C-B alloys were produced using hot pressing method.•In Fe-based composite alloys, the main phases were Fe, and M(Cr,Fe)7C. It was observed that the phases were changed by varying the ratio of B and the percentage of C.•The Curie temperature of FeCr composites can be adjusted by adding Carbon and Boron element.•The hardness and density of alloy changed by adding C and B elements.