Fine structure and phase composition of Fe–14Mn–1.2C steel: influence of a modified mixture based on refractory metals

Abstract

The effect of TiO₂, ZrO₂ and Na₃AlF₆ ultrafine powders on the fine structure and the phase composition of Fe–14Mn–1.2C steel was investigated. The introduction of the ultrafine powders into the melt influenced the grain size, the quantity, and the character of distribution of nonmetallic inclusions in the railroad frogs. The microstructure of castings was improved significantly because of the refinement of the grain structure and an increase of the grain-boundary area. After the modifying mixture was introduced into the melt, either the microtwins of one or two intersecting systems or the precipitations of ε-martensite of different types, or simultaneously the microtwins and wafers of ε-martensite, were present in each grain.

Keywords

manganese steel / fine structure / phase composition / refractory metals

References

[1] Issagulov A.Z., Akhmetov A.B., Naboko Y.P., Kusainova G.D., Kuszhanova A.A. The research of modification process of steel hadfield integrated alloy ferroalumisilicocalium (Fe–Al–Si–Ca/FASC). Metalurgija, 2016, 55(3): 333.

[2] Srivastava A.K., Das K. Microstructural characterization of Hadfield austenitic manganese steel. J. Mater. Sci., 2008, 43(16): 5654.

[3] Grajcar A., Galisz U., Bulkowski L. Non-metallic inclusions in high manganese austenitic alloys. Arch. Mater. Sci. Eng., 2011, 50(1): 21.

[4] Li X.Y., Wu W., Xi Y., Zu F.Q. The influence of SG modification on the microstructures of high manganese steel. Proceedings of the International Conference on Digital Manufacturing and Automation, 2010 704.

[5] Grajcar A., Kaminska M., Galisz U., Bulkowski L., Opiela M., Skrzypczyk P. Modification of non-metallic inclusions in high-strength steels containing increased Mn and Al contents. J. Achiev. Mater. Manufact. Eng., 2012, 55(2): 245.

[6] Dobrzanski L.A., Grajcar A., Borek W. Microstructure evolution and phase composition of high-manganese austenitic steels. J. Achiev. Mater. Manufact. Eng., 2008, 31(2): 218.

[7] Saburov V.P. Suspension modification of steels and alloys with ultradisperse powders, Liteinoe Proizvodstvo. No., 1991, 4, 14.

[8] Lazarova R., Kuzmanov P., Dimitrova R., Cherepanov A., Manolov V. Properties of 110-13 steel and SCh 25 cast iron modified by refractory nanopowder. Steel Transl, 2012, 42(4): 298.

[9] Kalinin V.T., Hrychikov V.E., Krivosheev V.A., Menyailo E.V. Theory and practice of cast-iron inoculation by ultra- and nanodispersed materials. Metall. Min. Ind., 2010, 2(5): 341.

[10] Zykova A.P. Influence of Ultrafine Mixture Tio2, Zro2 and Cryolite on the Structure and Physical-mechanical Properties Construction Cast Iron, 2015, Tomsk, Tomsk Polytechnic University 218.

[11] Zykova A.P., Kurzina I., Lychagin D.V., Chumaevsky A.V., Novomejsky M.Y. Influence of refractory metal oxide ultrafine particles on the structure and mechanical properties of high-manganese steel. Adv. Mater. Res., 2015, 1085, 260.