The features peculiar to the production of iron-based metal composites with additions of superfine composite powders synthesized as master alloys were studied. The composite powders resulted from the interaction of nanosized silicon carbide with iron oxide and sintered iron ore concentrate (SIOC). The superfine SiC–Fe2O3 and SiC–SIOC powder composites as master alloys contained multiple phases including silicon carbide, iron silicides, and silicon oxide and oxynitride (β-SiC, SiO2, β-Si3N4, Si2N2O, Fe2Si, Fe5Si3, FeO). The average particle size of the composite master alloy powders was 130 and 150 nm. Iron-based metal composites with 3, 5, and 7% master alloy were melted in an induction furnace at 1700°C for 40 min without a protective atmosphere through the complete dissolution of doping components and the formation of a homogeneous ferrite structure. Spectral analysis indicated that the total content of admixtures in the iron-based metal composites varied from 2.0 wt.% with a 3% master alloy addition to 4.1 wt.% with a 7% master alloy addition. The resultant alloys had a nanosized pearlite structure. The iron carbide lamellas reached 20–25 nm in size and the distance between them was no greater than 150 nm. Microdiffraction patterns showed α-Fe phase and nanocrystalline Fe3C and FeC carbides. The mechanical properties of the metal composites were examined. The addition of the synthesized superfine powder composites to the iron melt promoted excellent mechanical characteristics: in particular, the yield strength in uniaxial compression up to 1251 MPa, hardness (HV 10) up to 3.1 GPa, and plastic strain up to 31.1%. The influence of different heat treatment stages on the mechanical characteristics of the alloy was analyzed. Cold rolling of the pre-forged metal composites increased the yield stress to 1660 MPa and hardness to 4.4 GPa. Annealing of the metal composites at 700°C for 2 h resulted in 750 MPa yield stress, 34.5% plastic strain, and 2.5 GPa hardness.
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Translated from Poroshkova Metallurgiya, Vol. 60, Nos. 5–6 (539), pp. 82–91, 2021.
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Tymoshenko, Y.G., Gadzyra, M., Davydchuk, N. et al. Structurization of Steel Produced from Iron Doped with a Nanosized Silicon Carbide Composite Powder. Powder Metall Met Ceram 60, 323–330 (2021). https://doi.org/10.1007/s11106-021-00243-z
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DOI: https://doi.org/10.1007/s11106-021-00243-z