Nosov Magnitogorsk State Technical University (Magnitogorsk, Russia):

M. A. Polyakova, Dr. Eng., Prof., Dept. of Material Processing, e-mail: m.polyakova@magtu.ru
Yu. Yu. Efimova, Cand. Eng., Associate Prof., Dept. of Material Processing, e-mail: yu.efimova@magtu.ru

Indian Institute of Technology Bombay (Mumbai, India):

K. Narasimhan, Dr. Eng. Department of Metallurgical Engineering and Materials Science, e-mail: nara@iitb.ac.in
M. J. N. V. Prasad, Dr. Eng. Department of Metallurgical Engineering and Materials Science

Implementation of combined methods of deformational processing is on the cutting-edge of downstream steel manufacturing. The effect of plastic deformation on metals is the irreversible particular changes in microstructure. To develop new technological processes of metal ware manufacturing it is necessary to study the microstructure changing features in steel in order to predict its properties. Carbon steel wire with pearlite structure is used for a wide range of engineering components. Carbon steel wire was plastically deformed by drawing in combination with bending and torsion. Such combination resulted in characteristic changing of cementite plates. The main objective of the paper is to correlate cementite evolution of carbon steel wire after combined deformational processing by drawing with bending and torsion with its mechanical properties. The construction of the used laboratory setup consisted of two drawing dies and four-rolls system which makes it possible to change the deformation degree during drawing, bending by the use of rolls with different diameters as well as torsion deformation in wide range. Scanning electron microscopy and tensile test were used for analysis of processed carbon steel wire. It was observed that after combined deformational processing cementite lamellas were destroyed. After combination of drawing with bending, cementite lamellas became curve especially when in the four-rolls system the rolls with smaller diameter were installed. By the combination of drawing with bending and torsion, the cementite lamellas changed in the same manner as without torsion deformation, but boundaries between pearlite colonies could not be identified with smaller diameter of rolls. Because combined deformation schemes during combination of different kinds of deformation was rather complicated, they had different impact on strength and ductile properties of the processed pearlitic wire.

Authors appreciate PhD Alexandr Gulin (Nosov Magnitogorsk state technical university) for conducting tensile tests of the processed carbon steel wire and interpreting the experimental results.

The reported study was funded by RFBR according to the research project №18-58-45008 IND_a.

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