On Increasing Powder Carbon Steels Properties Using Activating Additives

L. Dyachkova 1
  • 1 O.V. Roman Powder Metallurgy Institute, Belarusian National Academy of Sciences, , Minsk, Belarus

Abstract

In this paper, the possibility of increasing powder carbon steels properties by activation of carbon diffusion into the iron base during sintering process due to the introduction of the thermally split graphite (TSG), macromolecular compounds (MC) and sodium bicarbonate was investigated. It was found that the introduction of these additives allows obtaining homogeneous structures at a sintering temperature of 100–200 °C lower than that traditionally used for sintering of powder carbon steels. Such structures provide increased mechanical properties of powder carbon steels. The addition of sodium bicarbonate increases the diffusion rate of carbon into iron at a temperature of 950 C by 1.8 times, at 1000 °C by 1.5 times, and at 1100 °C by 1.2 times.

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  • [1] Jonnalagadda K. (2012): Influence of graphite type on the Diffusion of Copper in Fe–C–Cu alloy systems. – Höganäs, 57 p.

  • [2] Hryha E., Nyborg L. and Alzati L. (2015): Dissolution of carbon in Cr-prealloyed PM steels: effect of carbon source – Powder Metallurgy, vol.58, pp.7-11.

  • [3] Zhang Z, Sandtrom R. and Wang L. (2004): Modelling of swelling of Fe–Cu compacts sintered at temperatures above the copper melting point – Journal of Materials Processing Technology, vol.152, pp.131-135.

  • [4] Hryha E., Nyborg L. and Alzati L. (2013): Effect of Carbon Source on Oxide Reduction in Cr–Prealloyed PM Steels. – Proceedings of the 2012 Powder Metallurgy World Congress & Exhibition, H. Miura and A. Kawasaki ed., Yokohama, Japan Society of Powder and Powder Metallurgy, 16AT911 (CD-ROM).

  • [5] Danninger H., Frauendienst G., Streb K.D. and Ratzi R. (2001): Dissolution of different graphite grades during sintering of PM steels – Mater. Chem. Phys., vol.67, рр.72-77.

  • [6] Gilardy R., Alzati L., Oro R., Hryha E., Niborg L., Berg S. and Radicch L. (2016): Reactivity of carbon based materials for powder metallurgy parts and hard metal powders manufacturing. – Journal of the Japan Society of Powder and Powder Metallurgy, vol.63, No.7, pp.548-554.

  • [7] Gilardy R., Alzati L., Oro R., Hryha E., Niborg L., Berg S. and Radicch L. (2015): The role of carbon source in the production of ultrafine and nanocrystalline WC-6Co cemented carbides. – Euro PM2015 Proceedings, Hardmetals-Processing, pp.1-6.

  • [8] Tanaka Y. and Lund J.A. (1986) Catalysis of alloying in iron-graphite contacts. – Int. J. Powder Met., vol.22, No2, pp.73-80.

  • [9] Hryha E. and Nyborg L. (2014): Effectiveness of reducing agents during sintering of Cr–prealloyed PM steels. – Powder Metallurgy, vol.57, pp.245-250.

  • [10] Dorofeev V.Yu., Eremeeva J.V., Yaitsky D.L. and Ulyanovsky A.P. (2002): Effect of the type of carbon-containing component and the method of forming the charge on the chemical composition of iron–carbon materials. – Metallurg, No.8. pp.45-47.

  • [11] Eremeeva J.V., Nitkin N.M. and Sharipzyanova G.Kh. (2011): Features of the use of nanosized carbon and chromium powders on the processes of preparing the charge and pressing powder steels. − Bulletin of Moscow State Technical University MAMI, No.2 (12), pp.123-127.

  • [12] Gilardi R., Alzati L., Oro R., Hryga E., Nyborg L., Berg S. and Radicchi L. (2013): Synthesis of nanostructured tungsten carbide powders from mechanically activated mixes of tungsten oxide with different carbon sources. − Euro PM2013 Proceedings, vol.1, pp.89-94.

  • [13] Lanskaya K.A., Kulikova L.V. and Spring V.V. (1989): Microalloying and impurity elements in low-alloyed chromium-molybdenum-vanadium steel. − Moscow, Metallurgy, 176 p.

  • [14] Axelrod A.E., Axelrod A.E., Popov V.V. and Filippenkov A.F. (1988) The effect of additives of alkaline earth and rare earth metals on the composition of sulfide inclusions and properties of cast steel. − Metal science and heat treatment, No.12. pp.47-50.

  • [15] Wang L., Lianzhonf C., Wu Q. and Ma L. (1989): Superplastisity in Mg6Mn0,6 alloys with minor additions of rare earth elements. − Prog. 1st Int. Conf. Met. And Mater. Sci. Tungsten Titanium, Rare Earth and Antinomy. – Bujing, Oxford, vol.1, pp.1244-1250.

  • [16] Mukerjee P., Mediratta S.R., Chacrabarti A.K. and Banerjee P. (1988): Effect of melt treatment with NaCl on the microstructure and properties of 0.2 C steels. − J. Mater. Sci. Jett., No.1, рр.43-46.

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