Abstract
The process of drawing thin carbon steel wires through conical dies is used as an experimental method for determining the effect of frictional conditions and die angle on the generation of fine grain layers in the vicinity of the friction surface. In this study, a quantitative criterion for determining the thickness of fine grain layers is proposed. The criterion is based on the coefficient of anisotropy that characterizes the shape of grains. It is shown that fine grain layers are generated under all frictional conditions investigated, but the thickness of the layer depends on these conditions and die angle.
Highlights
In products of metal forming and metal cutting processes, material properties in narrow layers near friction surfaces are usually very different from that in the bulk
A distinguished feature of the present research is that the effect of frictional conditions on the generation of fine grain layers is studied using the process of drawing of thin wires
Itcoefficient is possible study thewhich pearlite grains’ deformation by metallographic using of to anisotropy, characterizes the deviation of grain linearmethod dimension in the the coefficient of anisotropy, which characterizes the deviation of grain linear dimension in the drawing direction and perpendicular to the drawing axis
Summary
In products of metal forming and metal cutting processes, material properties in narrow layers near friction surfaces are usually very different from that in the bulk. To develop a method for controlling the material properties within the fine grain layers using parameters of metal forming processes, it is necessary to study the effect of these parameters on the parameters that classify essential properties of the layers. In [14,15,16], the contact surface between the tool and test piece was intentionally treated to increase the friction stress as much as possible These papers all dealt with the effect of geometric parameters of the processes on fine grain layers. A distinguished feature of the present research is that the effect of frictional conditions on the generation of fine grain layers is studied using the process of drawing of thin wires. This feature may be of importance for the efficient use of thin wires under service conditions
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