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

TitleResearch of Possibility of Control of the Formation of Crystal structure of Metal Alloys
Publication TypeJournal Article
Year of Publication2020
AuthorsNuradinov, AS, Nogovitsyn, AV, Nuradinov, IA, Zubenina, NF, Sirenko, KA
Short TitleSci. innov.
SectionResearch and Engineering Innovative Projects of the National Academy of Sciences of Ukraine
Introduction. The modern trend in the development of engineering is characterized by ever-increasing demands on the quality of the metal products used for this. it is impossible to improve the quality of metal products without improving technologies for the smelting and casting of metal alloys.
Problem Statement. It is known that metal products made from the cast billets with a dispersed crystalline structural structure have a minimum level of licensing and favorable results of non-metallic inclusions, and have the highest level of mechanical properties. To obtain a cast metal with such a structure, it is necessary to ensure the maximum crystallization rate and the amount of supercooling at the phase boundary, which, when real billets are formed, progressively decrease as the thickness of the hardened metal crust increases (5-10 times).
Purpose. Development of scientifically based technological methods for controlling the formation of a cast structure of metal billets by means of thermo-force external influences on liquid and hardened metal.
Materials and Methods. An alloy of camphene with tricycylene, which, like metals, crystallizes in the temperature range (45-42 °C) with the formation of a dendritic structure, and also has the following original properties. Aluminum of technical purity A5, which crystallizes with the formation of a very wide transcrystallization zone, was used as a metal system in the work. And it is convenient to evaluate the relative effectiveness of the impact of various methods of external influences on the formation of the crystalline structure of metals by their influence on the width and dispersion of the transcrystallization zone.
Results. Experimental studies have confirmed the ability to control the formation of the structure of cast metals using various methods of external thermoforce effects on liquid and hardened melt.
Conclusions. The results obtained open up the prospect of developing new metallurgical technologies for the effective management of the cast metal structure at the first stage of production of billets.
Keywordsbillet, cooling intensity, crystallization, melt, overheating, structure, subcooling, vibration
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