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The mechanical properties of sintered steels are depending mainly on the powder microstructure. The paper presents studies of ferromanganese powder obtained by milling. The X-ray diffraction analysis evidenced two chemical compounds: the major compound is FeMn₄, and some traces of complex ferromanganese carbide Fe_1.1Mn_3.9C₂. The carbide hardness is 2365 HV_0.02. They are dispersed in the major micro structural constituent, α Mn phase. The observed microstructure prove that α Fe appears only as phase in a pearlite like eutectoid constituent. It appears as a grey lamellar micro structural constituent having an average grain size of 50 μm. This constituent feature present hardness values lower than 715 HV_0.02. Finally, we could conclude that the particle size do not affects the powder composition and micro structural constituents'' distribution. The particle size affects only the technological properties as apparent density and the flow rate.

Keywords: ferromanganese powder, hard compounds, phase distribution