Nanodispersing Modification of 110G13L Steel
V. A. POLUBOYAROV1, N. Z. LYAKHOV1, Z. A. KOROTAEVA1, A. A. ZHDANOK1, V. A. KUZNETSOV2
1Institute of Solid State Chemistry and Mechanochemistry, Siberian Branch of the Russian Academy of Sciences, Ul. Kutateladze 18, Novosibirsk 630128 (Russia)
2Sibelektroterm Ltd. Company, Ul. Petukhova 51, Novosibirsk 630088 (Russia)
Keywords: величина зерна, временное сопротивление разрыву, дисперсное модифицирование, карбиды вольфрама, титана и бора, медь, модификатор, относительное удлинение, СВС, сталь 110Г13Л, ферротитан, grain size, point of maximal load, dispersing modification, tungsten titanium and boron carbides, copper, modifying agent, relative elongation, SHS, 110G13L steel, ferrotitanium
Abstract
Intra-mold modification of 110G13L steel was carried out using various dispersed modifying agents containing boron, tungsten, titanium carbides, ferrotitanium, and carbon as the active phase. To improve wettability, modifying agents were treated preliminarily with copper powder in AGO-3 planetary centrifugal mill. It was discovered that the microstructure of the formed steel samples is composed of austenite and carbides released inside the grains and along their boundaries. A significant increase in the point of maximal load by 14.5, 18.0 and 9.0 % was demonstrated by the steel samples treated with the modifying agents containing boron carbide (concentration of the active phase: 0.056 %), a mixture of tungsten and titanium carbides (0.033 %) and titanium carbide (0.083 %), respectively. In addition, the use of a mixture of tungsten and titanium carbides allowed us to increase relative elongation by 40 %. The use of the modifying agents containing boron carbide and a mixture of tungsten and titanium carbides promotes uniform distribution of carbides and a substantial decrease in grain size; the grain size (according to the State Standard GOST 5639) corresponds to two points (the actual grain diameter is 0.387-0.694 and 0.338-0.581 mm, respectively). The grain size in the reference sample is more than three points (the actual grain diameter is 2.325-3.168 mm). The grain size in other modified steel samples corresponds to three points and more.
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