Research of internal structure of metal during rolling processes of metal products
Received 23.05.2021, Revised 16.10.2021, Accepted 19.11.2021, Published 17.12.2021
Abstract
To study structural transformations of metals and alloys during treatment with pressure to determine reduction modes that improve quality of metal products. When developing new technological processes of rolling, special attention is paid to quality of obtained metal products, which completely depends on internal structure of metals. In this regard, research of reduction mode impact on metal structure is relevant task; solution of this task will ensure production of high-quality products. Research methods are based on usage of fundamental provisions of materials science and theory of metal treatment with pressure. Experimental studies were carried out using metallographic microscope, taking into account specifics of determination of metal structure. Scientific novelty lies in research of influence of treatment mode during reduction on degree of metal alloys amorphousness. Practical significance of research is in determination of rational treatment modes that can improve quality of metal products by increasing amount of amorphization. Microstructural analysis of metals and alloys structure was performed and metallographic images of microsections of low-carbon steel, which showed that metals and alloys structure consists of grains and boundaries between them, were executed. Grain boundaries were accepted to be amorphous. Dependency between steel amorphousness degree and size of internal structure grain was determined, and effect of cooling speed on ratio of amorphization temperature to melting temperature was studied, which enables to control crystallization process. Influence of reduction modes during processing on change of metal products structure is analyzed. Reduction modes that provide intensive increase in amount of amorphization of low-carbon steel were identified. Methods for increasing degree of amorphousness in internal structure of alloys, which provide increase of products quality, were determined.
Keywords:
internal structure; structure; grain; microsection; reduction modes; amorphization; degree of deformation