Modification of Grey Cast Iron and Steel by Efficient Compositions Based on Nanodispersed Powders of Tungsten and Titanium Carbides
V. A. POLUBOYAROV, Z. A. KOROTAEVA, A. A. ZHDANOK, F. K. GORBUNOV
Institute of Solid State Chemistry and Mechanochemistry, Siberian Branch, Russian Academy of Sciences, Novosibirsk, Russia
Keywords: внутриформенное модифицирование, карбиды вольфрама и титана, самораспространяющийся высокотемпературный синтез, сталь 110Г13Л, чугун, intra-mould modification, titanium and tungsten carbides, self-propagating high-temperature synthesis (SHS), Hadfield (110G13L) steel, grey cast iron
Abstract
Complex comparative analysis of some modifiers based on refractory ceramic particles was carried out. Compositions based on nanodispersed tungsten and titanium carbides were obtained by a combined method (self-propagating high-temperature synthesis in combination with mechanochemical treatment). In experiments on intra-mould modification of grey cast iron and 110G13L steel, they demonstrated the maximum efficiency compared to other studied modifiers: within ceramic phase concentrations of 0.013-0.2 %, for gray cast iron, an increase in tensile strength was to 20 %, in hardness - to 13 %, in wear resistance - to 69 %, in corrosion resistance - 2.6 times; for steel, an increase in temporary tear resistance reached 18.0 %, in relative elongation - to 40 %, grain size reduction - by 6.8 times. As demonstrated during modification of grey cast iron by additives containing nanodispersed ceramic phases, not only the concentrations and composition of modifiers but also various process parameters (the design, the volume of the mold, the method of introduction of modifiers, etc. ) should be taken into account.
DOI: 10.15372/CSD20180108
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