Panov A.G., Degtyareva N.G., Murin N.V. Study of the influence of microstructure on the growth resistance of austenitic nickel cast irons
This paper devoted the instability of the growth resistance of castings made of austenitic nickel-based cast irons such as NIRESIST. The paper presents the results of an analysis of theoretical assumptions regarding the influence of the chemical composition and crystallization conditions of castings such as the working parts of submersible pumps made of NIRESIST on their tendency to grow at high subzero operating temperatures. The microstructures of representative industrial castings were examined after growth resistance tests at -60°C. It is demonstrated that an objective assessment of the microstructure of NIRESIST by comparing scales using GOST 3443-87 is impossible. It is shown that when the chemical composition reaches a critical level from the point of view of growth resistance, the growth of NIRESIST due to martensitic transformation can be caused by the heterogeneity of the microstructure, the presence of local areas depleted in austenite-stabilizing elements, especially carbon inside the colonies of interdendritic fine-plate graphite and point graphite.
Keywords:Austenitic cast iron, NIRESIST, liquation, growth resistance, microstructure.

Boldyrev D.A. On the relationship with the structure of high-strength cast iron, the solubility and digestibility of ferrosilicon during late graphitization modification
The materials and technologies of late graphitizing modification of high-strength cast iron used in the world foundry practice are given. Their characteristic features and application-limiting disadvantages are described. A special place among all the methods of late graphitizing modification of high-strength cast iron is shown to be the use of ferrosilicon grade FeSi75 in the casting bowl of the mold in terms of its technological simplicity and cost-effectiveness. The problem of the effectiveness of modification depending on the macro- and microstructure of a piece of FeSi75 is indicated. The peculiarities of the influence of its macro- and microstructure on solubility and digestibility in the cast iron melt are revealed.
Keywords:Later graphitizing modification, solubility, digestibility, macro- and microstructure of a piece of ferrosilicon.

Nikitin K.V., Timoshkin I.Yu., Biktimirov R.M. Increasing the efficiency of modifying AK9ch and AMg6l casting alloys by using deformed waste in the charge
The results of studies on the effect of the charge composition on the structure and mechanical properties of casting aluminum alloys AK9ch and AMg6l are presented. It is shown that the inclusion of deformed waste in the charge composition contributes to the formation of a dispersed micro- and macrostructure of the working alloys in the solid state. The effect of modification (AlSr20 alloy for AK9ch; AlTi5 alloy for AMg6l) on the structure and mechanical properties of alloys obtained using different charge compositions is investigated. It has been established that the structure of deformed waste is partially inherited by working alloys through the liquid state. The results obtained have shown that the optimal amount of deformed waste in the composition of the charge allows for a reduction in the consumption of expensive modifying лигатур in practice, while ensuring a guaranteed effect from modification.
Keywords:Aluminum alloys, deformed waste, modification, structure, mechanical properties, and the phenomenon of structural inheritance.

Volnov I.N., Khasan A. On the question of modeling hot tearing in castings
Physical and computational experiments on hot tearing formation in castings were conducted using two types of process samples and two alloys: AL7 and AK7ch. The experimental results were compared. It was shown that modern commercial computer modeling systems, when used to predict hot tearing in castings, are insensitive or only weakly sensitive to the specific features of the actual casting process—the unevenness of casting deformation or the localization of this deformation. This explains the lack of quantitative hot tearing calculation tools in these systems. Only qualitative estimates are available. This article proposes a method for accounting for the unevenness of casting deformation or the localization of this deformation by calculating a strain localization coefficient. Introducing this coefficient into the modeling results allows for consistency with physical experimentation and quantitative prediction of hot tearing formation in castings.
Keywords:Hot tearing, casting, hot tearing testing, deformation, computer modeling, aluminum alloys, deformation localization, hot tearing healing.

Doroshenko S.P. The image of Jesus Christ in casting
The article provides brief information about images of Christ in reliefs and sculptures cast in bronze and other casting alloys, the most durable monuments that have stood the test of time.
Keywords:Foundry alloys, bronze, sculptures, bas-reliefs.

Panov A.G., Degtyareva N.G., Murin N.V. Study of the influence of microstructure on the growth resistance of austenitic nickel cast irons

b>Boldyrev D.A. On the relationship with the structure of high-strength cast iron, the solubility and digestibility of ferrosilicon during late graphitization modification

Nikitin K.V., Timoshkin I.Yu., Biktimirov R.M. Increasing the efficiency of modifying AK9ch and AMg6l casting alloys by using deformed waste in the charge

Volnov I.N., Khasan A. On the question of modeling hot tearing in castings

Doroshenko S.P. The image of Jesus Christ in casting