Gradient Submicrocrystalline Structure In Fe-cr-co System Hard Magnetic Alloys

摘要

The evolution of the structure and microhardness of Fe-25Cr-15Co and Fe-30Cr-8Co (number indicate wt.%) hard magnetic alloys during complex two-stage upsetting-torsion under isothermal conditions at different temperatures is experimentally studied. It is revealed that the deformation leads to a strong refinement of the initial coarse-grained structure in both alloys. The generated structure is non-uniform through the body of the samples and has gradient character. In the active zone of deformation near to the mobile head, there is a microcrystalline layer with a grain size of about 5 μm in a single phase Fe-30Cr-8Co alloy and a micro duplex structure with a grain size of about 0.5 μm in a two-phase Fe-15Co-25Cr alloy. With removal from the active zone of deformation the grain size increases, and microhardness decreases.