Affiliation:
1. O.V. Roman Powder Metallurgy Institute, Belarusian National Academy of Sciences , 41, Platonov st., 220005 Minsk , Belarus
Abstract
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.
Subject
Fluid Flow and Transfer Processes,Transportation,Civil and Structural Engineering
Reference16 articles.
1. [1] Jonnalagadda K. (2012): Influence of graphite type on the Diffusion of Copper in Fe–C–Cu alloy systems. – Höganäs, 57 p.
2. [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. [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. [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, 16A–T9–11 (CD-ROM).
5. [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.