In the present work, a method for processing of a technically usable Fe-26 %Cr-16 %Co-2 %Mo-2 %W hard magnetic alloy from powder raw materials is proposed. The distinctive feature of the method is the lowered sintering temperature of powder compacts (1100-1200°C). Sintered blanks are subjected to a hot rolling process at 1150°С. The magnetic material produced by the proposed method has a relative density of about 97 to 98 %. Magnetic properties of the alloy sintered at 1200°C (B r = 1,2 T, H cb = 51kA / m, (BH) max = 30 kJ / m 3) are on the same level as for alloys obtained by powder metallurgy methods with sintering temperatures higher than 1300°C and their cast analogs. At the same time, low magnetic properties were obtained on the alloy sintered at 1100°C with the following hot rolling. Using EDX analysis and X-ray phase analysis it has been established that this is due to the presence of a significant fraction of non-magnetic γ-phase in the samples. Apparently, under these sintering conditions the redistribution of alloy components does not succeed. Tensile strength tests of the hot-rolled alloy after heat treatment showed a significant effect of sintering temperature on the samples strength. The tensile strength was higher for the samples sintered at 1100°C (700-930 MPa) as compared to the samples sintered at 1200°C (520-590 MPa). Microstructural studies of the samples showed that alloy sintered at 1200°C had a more coarse-grained structure. Apparently, this is a cause of the tensile strength reduction.

No abstract

No abstract

No abstract

No abstract