Low-temperature sintering and hot rolling of hard powder magnetic Fe-Cr-Co alloy

A.S. Ustyuhin, A.B. Ankudinov, V.A. Zelenskii, I.M. Milyaev, M.I. Alymov show affiliations and emails
Received 25 May 2017; Accepted 27 June 2017;
This paper is written in Russian
Citation: A.S. Ustyuhin, A.B. Ankudinov, V.A. Zelenskii, I.M. Milyaev, M.I. Alymov. Low-temperature sintering and hot rolling of hard powder magnetic Fe-Cr-Co alloy. Lett. Mater., 2017, 7(3) 249-253
BibTex   https://doi.org/10.22226/2410-3535-2017-3-249-253

Abstract

In present work a method for obtaining technically useful 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).In present work a method for obtaining technically useful 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. Magnetic material produced by the proposed method has relative density about 97 – 98 %. Magnetic properties of alloy sintered at 1200°C (Br = 1,2 T, Hcb = 51kA / m, (BH)max = 30 kJ / m3) 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 alloy sintered at 1100°C with the following hot rolling. Using EDX analysis and X-ray phase analysis it is established that this is due to the presence of 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). Investigation of the samples microstructure showed that alloy sintered at 1200°C has a more coarse-grained structure. Apparently this is a cause of the tensile strength reduction.

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