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Magnetic hysteresis properties of powder hard magnetic Fe-27Cr-10Co-1Si alloy © Authors, 2018

DOI j19998465-201807-07

Keywords:

D.M. Abashev – Foreman, JCS «Spetsmagnit» (Moscow); Post-graduate Student, A.A. Baikov Institute of Metallurgy and Material Science RAS (Moscow)
E-mail: d.abshv@gmail.com
I.M. Milyaev – Dr.Sc.(Eng.), Associate Professor, Main Research Scientist, A.A. Baikov Institute of Metallurgy and Material Science RAS (Moscow)
E-mail: imilyaev@mail.ru
M.I. Alymov – Dr.Sc.(Eng.), Corresponding Member of RAS, Director of Merzhanov Institute of Structural Macrokinetics and Materials Science RAS (g. Chernogolovka)
E-mail: alymov@ism.ac.ru
I.N. Bouryakov – Ph.D.(Eng.), General Director of JCS «Spetsmagnit» (Moscow)
E-mail: bouriakov@mail.ru
V.S. Yusupov – Dr.Sc.(Eng.), Head of Laboratory, A.A. Baikov Institute of Metallurgy and Material Science RAS (Moscow)
E-mail: yusupov@aport2000.ru
V.A. Zelensky – Ph.D.(Eng.), Leading Research Scientist, A.A. Baikov Institute of Metallurgy and Material Science RAS (Moscow)
E-mail: zelensky55@bk.ru
G.Yu. Lazorenko – Junior Research Scientist, A.A. Baikov Institute of Metallurgy and Material Science RAS (Moscow)
E-mail: las_galina@mail.ru


The aspiration to estimate the potential of powder FeCrCo alloys with the 10 wt. % cobalt from the point of view of technological effectiveness of their production for industrial production from them permanent magnets was the purpose of the work.
Magnetic hysteresis properties (residual induction of Br, coercive force Нс and the maximum power product (BH)max) of powder hard magnetic Fe-27Cr-10Co-1Si alloy studied depending on major factors of heat treatment. As factors chose: initial temperature of thermomagnetic processing (a factor and), the speed of cooling up to 580°C V1 (a factor A) and the speed of cooling from 580°C to 500°C V2 (a factor C). In addition realized a tempering in a temperature interval 500…460°C. Samples of the studied powder alloy received from the element powders Fe, Cr, Co, Si after sintering at 1420°C within 2.5 hours. Optimization of the condition of heat treatment performed both method of a one-factorial experiment, and method of planning of an experiment with creation of the central composite plan 23 + by star points. Statistical processing of the received results carried out with use of a software package of «Statgraphics Centurion XVI». The statistical analysis of the obtained experimental data taking into account the corresponding charts of Pareto allowed to receive analytical dependences in the form of the regression equations of residual induction of Br, coercive force HcB and the maximum power product (BH)max from the chosen variation factors. In the received regression equations free members give average values Br, HcB and (BH)max equal 1,28 T, 42 kA/m and 39,2 kJ/m3 respectively.
On the optimum condition of heat treatment of Fe-27Cr-10Co-1Si alloy for obtaining optimum value (BH)max including tempering from 1100°C in water + thermomagnetic heat treatment 660°C (10 min) + cooling in magnetic field to 580°C with V1 = 13°C/hour + cooling without magnetic field from 580°C to 500°C with V2 = 3,6°C/hour + additional tempering in a temperature interval 500…460°C were processed 6 pieces of samples in one party. Br values to 1,32 T, HcB to 42,6 kA/m and (BH)max to 42,3 kJ/m3 were received.

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