Abstract
We have studied and described the mechanism and kinetics of thermodiffusional alloying of iron powder by Cr, Ni, Mo oxides and carbon in halogen-containing media. Oxides of Cr, Ni, and Mo are easily reduced to the metal in the presence of metallic iron, ammonium chloride, and combination media (H2+C, H2+CO). We have studied the chemical compositions and physicotechnological properties of the powders produced. The homogeneity of the alloy formed meets the GOST 4543-71 standard (“alloyed structural steel”). We have studied the processes of compaction of powdered low-alloy steels by means of extrusion. A combination of extrusion and high-temperature thermomechanical treatment (HTMT) followed by low temperature treatment makes it possible to produce alloyed powdered steels with better characteristics: σ=2085 (P40Kh), 2420 MPa (P40KhN2MA); impact strength KC was respectively 465 and 655 kJ/m2. High strength and ductility are achieved by HTMT due to formation of a fragmentary substructure, i.e., the martensite inherits the dislocation structure of the deformed austenite. Our results were used to develop a technique for production of low-alloy powdered steels by extrusion combined with conventional thermal and high-temperature thermomechanical treatment.
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State Engineering University of Armenia, Yerevan. Translated from Poroshkovaya Metallurgiya, Nos. 1/2(377), pp. 5–11, January–February 1995.
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Agbalyan, S.G., Assila, S.A., Manukyan, N.N. et al. Low-alloy powdered steels obtained by metal oxide technology. Powder Metall Met Ceram 34, 5–10 (1995). https://doi.org/10.1007/BF00559843
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DOI: https://doi.org/10.1007/BF00559843