Number 11, 2022
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»здательский дом ЂЋитейное производствої выпускает два специализированных научно-технических журнала с периодичностью: ЂЋитейное производствої Ц ежемес€чно, Ђћеталлурги€ машиностроени€ї Ц 1 раз в 2 мес€ца.
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Minenko G.N. Effect of graphitization on the electrical conductivity of gray iron
The results of the study of the electrical conductivity of the SCh18 gray iron are presented. Its dependence on the cooling rate of castings (samples) and its influence on the strength of gray iron are shown.
Keywords: Gray iron, structure, electrical conductivity, strength, cooling rate.

Malinov L.S. High-carbon medium-manganese steels with metastable austenite and self-hardening effect under loading
The results of studies on the abrasive and shock-abrasive wear resistance of high-carbon medium-manganese steels with metastable austenite and the effect of self-hardening under loading (SHL) are summarized. The controlling of the amount and stability of austenite in them by changing their composition and heat treatment modes as applied to abrasive wear conditions makes it possible to increase their mechanical properties and wear resistance is shown. Data on the higher durability of parts cast from them than from steel 110G13L and therefore they should be considered as an alternative to it are given.
Keywords: Steel, metastable austenite, deformation martensite, self-hardening effect under loading, wear resistance.

Kudryashov A.E., Kostina M.V., Muradyan S.A., Rigina L.G., Kostina V.S. Structure, mechanical properties and cold resistance of cast nitrogen-containing high-strength austenitic steel The cast austenitic steel 05Kh21AG15N8MFL hardened by nitrogen alloying is considered. An influence of the structural components of the steel on mechanical properties and cold resistance is shown. It is concluded that the ?-ferrite presenting in the structure is the key factor in reducing the cold resistance of steel, since the ?-ferrite is subjected to a ductile-brittle transition when the temperature drops below Ц70∞C. The non-metallic inclusions present in the steel do not serve as crack initiation centers at Ц110ЕЦ160ºC, but they have a stress-relaxing effect.
Keywords: Steel, composition, mechanical properties, cold resistance, non-metallic inclusions, structure, δ-ferrite, fracture.

Marukovich E.I., Stetsenko V.Y., Stetsenko A.V. Silumin modification mechanisms
Modification of silumins is a nanostructured process. Ti, Zr, B form intermetallides that refine aluminum nanocrystals from demodifying adsorbed hydrogen atoms. Phosphorus, atomically dissolving in silumin, refiners silicon nanocrystals from adsorbed oxygen. Na and Sr form an emulsion and colloid in liquid silumin, which protect eutectic microcrystals of α-phases and ?Si-phases from demodifying molecular hydrogen. All these processes increase the concentration of crystallization centers of dendritic microcrystals α-phase and ?Si-phase, make them more branched and compact.
Keywords: Modification, silumin, nanocrystals, adsorption, refining, oxygen, hydrogen, dendrites, aluminum, silicon.

Doroshenko V.V., Barykin M.A. Grain structure and hot brittleness of AlЦ6%MgЦ2%Ca alloy doped with zinc and titanium
The effect of additions of calcium, zinc, and titanium on the change in the grain structure and hot brittleness of AlЦ6 % MgЦ2 % Ca alloy is considered in comparison with the cast AlЦ10 % Mg alloy. The alloys were melted in a resistance furnace using both pure charge components and master alloys, followed by casting into graphite and steel molds. Optical microscopy was used to study the structure and determine the composition of the alloys. Samples for structural studies and determination of mechanical properties were produced from 10x20 mm flat castings, which were then recast into the "pencil-type" samples to test hot brittleness. It is shown that the Al6Mg2Ca2Zn experimental alloy is not inferior in hot brittleness to AlЦ10Mg alloy when cast with minimal overheating into a cold mold and it has a finer grain structure and similar hardness. The absence of zinc negatively affects both grain size and hot brittleness. On the contrary, the addition of titanium promotes the grain refinement, but the hot brittleness remains at the level appropriate for the Al6Mg2Ca alloy.
Keywords: Aluminum alloys, magnesium, alloying, grain, hot brittleness, hardness, calcium.

Pilipenko A.A. The strength of the ceramic mold based on the silica-free binder Alyumozol A
An increase in the strength of a ceramic mold based on the binder Alyumozol A intended for investment casting is considered. The following options for increasing the strength of the mold are proposed Ц the addition of sintering additives and reinforcing materials. It is suggested to use aluminum powder or titanium dioxide as sintering additives and aluminum oxide-based fibers as a reinforcing material.
Keywords: Investment casting, ceramic mold, binders, properties.

Timoshkin I.Yu., Nikitin V.I., Nikitin K.V., Nuzhdin G.S. Casting of aluminum alloys into a flexible chill mold
Analysis of the literature on chill casting of alloys based on non-ferrous metal was performed. The main shortcomings of the chill casting and ways to eliminate them are identified. A flexible chill mold for casting of aluminum alloy samples was produced. The effect of the chill mold flexibility on the mechanical properties of samples was investigated. The effectiveness of the chill mold flexibility in production of separately cast samples is demonstrated. It has been found out that the optimal gap between the mold plates is 0.2 and 0.3 mm for AK6M2 and Al-6%Mg alloys respectively.
Keywords: Chill mold, metal mold, aluminum alloys, mechanical properties, gas permeability, mold flexibility.

Muravyev Yu.N., Treshcalin A.V. Equipment for No-bake process manufactured by Rodonit LLC
The article analyzes the situation regarding the supply of foundry equipment for No-bake process to Russia, the factors influencing the choice of the proposed equipment are given, information is given about the equipment for no-bake process manufactured by Rodonit LLC.
Keywords: No-bake process, moulding equipment, reclamation plants, pneumo conveying systems.




Table of content

Knyazev S.V., Usoltsev A.A., Kutsenko A.I., Deev V.B. Kuznetsk scientific school of foundry workers 90 years old

Minenko G.N. Effect of graphitization on the electrical conductivity of gray iron

Malinov L.S. High-carbon medium-manganese steels with metastable austenite and self-hardening effect under loading

Kudryashov A.E., Kostina M.V., Muradyan S.A., Rigina L.G., Kostina V.S. Structure, mechanical properties and cold resistance of cast nitrogen-containing high-strength austenitic steel

Marukovich E.I., Stetsenko V.Y., Stetsenko A.V. Silumin modification mechanisms

Doroshenko V.V., Barykin M.A. Grain structure and hot brittleness of AlЦ6%MgЦ2%Ca alloy doped with zinc and titanium

Pilipenko A.A. The strength of the ceramic mold based on the silica-free binder Alyumozol A

Timoshkin I.Yu., Nikitin V.I., Nikitin K.V., Nuzhdin G.S. Casting of aluminum alloys into a flexible chill mold

Muravyev Yu.N., Treshcalin A.V. Equipment for No-bake process manufactured by Rodonit LLC


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