THE INFLUENCE OF TENSION WITH SIMULTANEOUS ROTATION ON OBTAINING THE STRUCTURE OF GLOBULAR PEARLITE DURING SPHEROIDIZING ANNEALING
https://doi.org/10.33815/2313-4763.2024.1.28.104-116
Abstract
Abstract. The development of new technologies of severe plastic deformation to form strengthened ultrafine-grained state in materials is a promising way of properties increasing. Such materials demonstrate not only a high level of strength properties, but also a sufficient level of technological plasticity. In current work, ways to form an ultrafine-grained high-strength state in wire by its intensive combined deformation and heat treatment are discussed. The goal of the work was to establish the fundamentals of the influence of intensive combined plastic deformation by torsion and tension on the formation of the structure of globular pearlite during spheroidizing annealing. The wire rod made of high-carbon steel grade 75 was used for investigation. The wire from this steel is used to produce reinforced concrete parts, for manufacturing of steel ropes, and as material for metal cord. It has been shown that as a result of torsion and tension treatment, pearlite colonies are deformed, the interlamellar distance increases, and the proportion of cementite plates of shorter length also increases. This effect deals with the influence of shear stresses during treatment on brittle cementite plates, which fragment under the influence of deformation. It has been established that torsion with tension, fulfilled before drawing, activates the cementite particles refinement, which intensifies the spheroidization process and provides formation of optimal structure for further drawing. It has been shown that to obtain the structure of globular pearlite for successful drawing, the best way is wire rod processing after hot rolling according to the scheme: deformation with tension and torsion and subsequent spherodizing annealing. In this work the results of such scheme realization were considered. Positive influence of preliminary combined plastic deformation on the formation of the structure of globular pearlite during spheroidizing annealing can be used at industry for producing spheroidized wire. The effect of proposed technology on the spheroidization process can reduce the duration of the spheroidizing annealing, and this will decrease the energy consumption and oxidative decarburization of the wire surface.
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