Research of Possibility of Control of the Formation of Crystal structure of Metal Alloys

Nuradinov, A. S.; Nogovitsyn, A.V.; Nuradinov, I.A.; Zubenina, N.F.; Sirenko, K.A.

doi:10.15407/scine16.04.067

Cited by 5 publications

(4 citation statements)

References 3 publications

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“…(t сол. -температура солідуса металевого сплаву, що розливається) [8,[15][16][17]. Необхідність дотримання цієї умови пов'язана з тим, що при більш високих температурах поверхні заготовки вона перебуватиме в твердо-рідкому стані і через низькі властивості міцності металу при цих температурах може легко зруйнуватися.…”

Section: кристалізація та структуроутворення сплавівunclassified

“…Відомо також, що градієнт температури перерізу розплаву, який твердіє залежно від його відношення до швидкості кристалізації (G/R) відіграє важливу роль у формуванні первинної структури в литих заготовках. При середніх значеннях цього співвідношення (G/R<5,5 10 7 ) формується дисперсна структура, а при нижчих його значеннях (G/R 9 <10 3 ) -груба рівновісна структура [16].…”

Section: кристалізація та структуроутворення сплавівunclassified

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Formation of the structure of sheet blanks during roll casting of metals

Nuradinov¹,

Nogovitsyn²,

Shkolyarenko³

et al. 2022

Processy litʹâ

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The physical modeling method was used to study the processes of formation of the structure of sheet blanks during ingotless casting-rolling of metals. At the same time, on the basis of theoretical analysis, the main parameters are determined, with the help of which it is possible to effectively control the processes of crystallization and the formation of the structure of sheet blanks. The studies carried out made it possible to establish the regularities of the influence of hydrodynamic and thermophysical conditions of pouring metal (the speed and nature of metal movement in the inter-roll space, the overheating temperature of the melt and the intensity of heat removal from it) on the processes of its crystallization and structure formation. A transparent organic alloy camphene (C10H16) was used as a modeling medium, which makes it possible to visually study these processes during the ingotless rolling of metals. Due to the transparency of camphene, the transformation of the sheet blank structure at different stages of its formation was clearly studied: the rough primary structure of the crusts solidifying on the rolls, due to their partial deformation in the rolling zone, passes into a fine-grained structure upon exiting it. The dependence of the linear rate of metal pouring on the overheating temperature of the melt and the intensity of heat exchange processes in the roller mold is shown. At the same time, the optimal ranges of values of these parameters are determined, which ensure the stability of the process of roll casting of metals. The results obtained were the basis for the development of practical recommendations for roll casting of real metals, in particular aluminum alloys of various grades. Keywords: roll casting-rolling of metals, roll mold, melt hydrodynamics, overheating temperature, intensity of heat exchange processes, sheet blank, casting speed, structure transformation.

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Section: кристалізація та структуроутворення сплавівunclassified

Formation of the structure of sheet blanks during roll casting of metals

Nuradinov¹,

Nogovitsyn²,

Shkolyarenko³

et al. 2022

Processy litʹâ

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“…Despite the usual attempts to ensure the formation of a homogeneous fine-grained structure throughout the volume of castings, similar to products made of rolled steel, in some cases, it is expedient to create differentiated (gradient) structures in castings to enhance special properties and working lifespan of cast products. The gradient nature of the structure of castings and its changes, depending on the thermokinetic conditions of crystallization, determine corresponding changes in mechanical properties in different sections of the castings, opening up new possibilities for engineering the structure and properties of cast products and increasing the competitive capacity of foundry technologies in engineering [1][2][3][4][5][6].…”

Section: Introductionmentioning

confidence: 99%

Thermokinetic Parameters of Solidification and Gradient Structure of Steel Castings

Kondratyuk,

Veis,

Parkhomchuk

et al. 2024

Metallofiz. Noveishie Tekhnol.

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Systematic studies of the influence and interrelation of the temperature and physicotechnological factors on the crystallization and formation of structural zones in steel castings are carried out. Therefore, research aimed at determining the boundaries of the optimal influence of the thermal and technological factors on the processes of crystallization and structural formation of steels is important for further use of the regularities of the formation of structural zones in castings to optimize their macro-and microstructures and physical and mechanical properties. Changing the temperature-time conditions of crystallization and post-crystallization cooling allows for regulating the processes of forming the structure of steel castings. The phase-structural state and properties of steel in different structural zones of castings depend not only on the technological parameters of casting and crystallization, but can also be intentionally modified by regulating the conditions of solidification and structure formation. The study investigates the patterns of forming the main macrostructural zones across the section of castings of carbon hypoeutectoid steels and the quantitative changes of their length depending on the thermokinetic conditions of crystallization.

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“…In various fields of production and economic activities, cast products of aluminum and its alloys have been widely used. In this regard, the problem of obtaining a high-quality structure of castings, on which their operational properties depend, is a problem to be urgently solved [1,2]. The studies of recent years have proved that it is possible to control the process of forming the casting structure by external physical influences on the metal in a liquid state, since there is a phenomenon of inheritance of the physical features of the melt in the casting properties [1][2][3][4].…”

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confidence: 99%

Innovative System of Computer Modelling of Multiphysics Processes for Controlled Electrocurrent Treatment of Melts

Zaporozhets¹,

Иванов²,

Kondratenko

et al. 2022

Sci. innov.

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Introduction. The widespread use of cast products made of aluminum and its alloys requires ensuring a highquality structure of the castings, on which their operational properties depend. Controlling the process of forming a high-quality structure of castings is possible, in particular, by the method of electrocurrent treatment of melts.Problem Statement. The melt medium being inaccessible for direct measurement of the processing parameters, the only way to realize the control of treatment conditions is numerical simulation of these parameters. However, the complexity and interdependence of multiphysics processes of melt electrocurrent treatment have led to an unconventional approach to the formulation of their mathematical models and computational procedures. These circumstances have determined the features of the tasks for the construction of appropriate computer models and their application.Purpose. The development of a new pattern-modular system for computer modeling of multiphysics processes of electric current treatment of melts to control the conditions of the formation of a qualitative structure of castings.Materials and Methods. The material of the research is a set of model problems of multiphysical processes of electrocurrent treatment and their ontology, the integral equations and their properties, as well as databases on the parameters of simulated objects, which describe these processes. The method of ontological taxonomy has been used to create a taxonomic codifier, with the help of which model problems and mathematical tools for their solution have been systematized. Based on the signs of similarity, the method of formalization of integral equations of coupled multiphysics processes has been applied. Results. The unified patterns of basic algorithmic procedures and a library of program modules for computing operations of partial tasks, for which a unique code is assigned according to the codifier have been developed. Combining the patterns with different modules that are identified by the indicated codes has made it possible to form a wide range of computer models reflecting multiphysics processes. A flexible system for computer modeling of multiphysical processes has been built and its efficiency for simulating the modes of electrocurrent treatment of melts has been confirmed.Conclusions. The results obtained have enabled controlling the conditions of electrocurrent treatment of melts to form a highquality structure of cast metal.

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Research of Possibility of Control of the Formation of Crystal structure of Metal Alloys

Cited by 5 publications

References 3 publications

Formation of the structure of sheet blanks during roll casting of metals

Formation of the structure of sheet blanks during roll casting of metals

Thermokinetic Parameters of Solidification and Gradient Structure of Steel Castings

Innovative System of Computer Modelling of Multiphysics Processes for Controlled Electrocurrent Treatment of Melts

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