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The Influence of Sintering Temperature and Content of High-Carbon Ferrochrome on the Structure and Properties of Iron–FKh800 Powder Composites

  • SINTERED METALS AND ALLOYS
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Powder Metallurgy and Metal Ceramics Aims and scope

The influence of sintering temperature and content of high-carbon ferrochrome on the phase composition, structure, and mechanical properties of chromium carbide powder steels was studied. When sintering temperature changed from 1100 to 1250°C, the bulk shrinkage, density, porosity, hardness, and bending strength of the iron-based composites with high-carbon ferrochrome FKh800 varying from 25 to 40 wt.% increased nonmonotonically and their porosity decreased. The optimal sintering conditions were established for the Fe–(25–40 wt.%) FKh800 composites, and FKh800 content in the composition range under study was found to hardly influence the optimal sintering temperature of the composites. A vertical section was constructed by analytical/graphical method and demonstrated wide regions of two-phase (γ-Fe) + (Cr, Fe)7C3 and (α-Fe) + (Cr, Fe)7C3 equilibria. The constructed vertical section allowed the eutectic composition and eutectic formation temperature to be determined for the iron-based composites with FKh800, which were 73.7 wt.% Fe–26.3 wt.% FKh800 and 1285°C, and a tentative optimal sintering range to be found, which varied from 1100 to 1250°C. Electron microscopy studies of the carbide steels showed that their microstructure was heterogeneous and consisted of metallic and carbide phases and a number of pores. According to electron microprobe analysis and X-ray diffraction of the carbide steel, its metallic phase was close in composition to chromium steel Kh17 and its carbide phase corresponded to (Cr, Fe)7C3. The effect of 25–40 wt.% high-carbon ferrochrome on the mechanical properties of the composites was examined. When FKh800 content changed from 25 to 35 wt.%, the hardness and bending strength increased and fracture toughness decreased. The optimal combination of these mechanical properties was shown by the 65 wt.% Fe–35 wt.% FKh800 carbide steel.

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Authors and Affiliations

  1. Frantsevich Institute for Problems of Materials Science, National Academy of Sciences of Ukraine, Kyiv, Ukraine

    V.A. Maslyuk, Y.S. Kyryliuk, A.A. Bondar, O.M. Gripachevsky & M.I. Podoprygora

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  1. V.A. Maslyuk
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  2. Y.S. Kyryliuk
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  3. A.A. Bondar
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  4. O.M. Gripachevsky
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  5. M.I. Podoprygora
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Correspondence to Y.S. Kyryliuk.

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Translated from Poroshkova Metallurgiya, Vol. 60, Nos. 3–4 (538), pp. 58–68, 2021.

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Maslyuk, V., Kyryliuk, Y., Bondar, A. et al. The Influence of Sintering Temperature and Content of High-Carbon Ferrochrome on the Structure and Properties of Iron–FKh800 Powder Composites. Powder Metall Met Ceram 60, 174–182 (2021). https://doi.org/10.1007/s11106-021-00225-1

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