EFFECT OF CARBON CONTENT IN STEEL WIRE ON RESIDUAL STRESSES IN MONOLITHIC DRAWING

Abstract

In this paper, numerical simulation experiments were performed to determine residual stresses in the wire after drawing in a monolithic die. The effect of carbon content in steel on the sign and level of axial, radial, and tangential residual stresses was investigated. The analysis showed that, regardless of the reduction value and die angle, an increase in the carbon content in steel leads to an increase in tensile axial stresses near the wire surface and an increase in compressive axial stresses in the central part of the wire cross-section. When the carbon content changes from 0.1 to 0.65% C, the tensile residual stresses in the surface sections of the wire increase by 150–200 MPa. Radial residual stresses in the surface layers of the wire, regardless of the studied process parameters and carbon content, are close to zero. In the central part of the wire, radial stresses have a negative sign, i. e., are compressive An increase in the carbon content leads to a slight (20–70 MPa) increase in stress. Increasing the carbon content in steel leads to increased tangential stresses, both compressive in the central sections and tensile in the surface sections. To reduce the negative impact of residual stresses on the properties of finished wire, when developing drawing technology and routes, it is necessary to take into account the influence of process parameters, chemical composition and, as a consequence, the mechanical properties of the wire on the sign and level of axial, radial and tangential stresses. A promising approach for the drawing process could be to obtain qualitative and quantitative relationships reflecting the influence of drawing process parameters (reduction, die angle, friction coefficient, drawing speed, and diameter) on residual stresses in the wire.