Effect of Stress-Strain State during Combined Deformation on Microstructure Evolution of High Carbon Steel Wire

Abstract

It is shown that new methods of severe plastic deformation design require combining different methods of plastic deformation. As for carbon steel wire, using drawing as a basic operation is obvious. The combination of drawing with bending and twisting was estimated by the stress-strain uniformity complex. It allows choosing the deformation processing conditions which ensure the uniform stress-strain state in each point of the carbon steel wire cross section. Based on such combination, a new method for manufacturing of semi-products with ultra fine grain structure by drawing with torsion was developed. The combination of wire drawing in two consecutively arranged dies with simultaneous bending and torsion allows achieving complex stress-strain state of the processed metal and ensure the share stresses. Metallographic investigation shows that such scheme of combined plastic deformation provides the uniformity of metal microstructure in its cross section.

Comparative analysis of high carbon steel behavior on contact surface with a tool in different methods of deformational nanostructuring

“…The effectiveness of different methods of deformational processing can also be estimated using the index of stress state as an indicator which characterizes metal stress state in the deformation zone [38]…”

Shape Indexes for Dieless Forming of the Elongated Forgings with Sharpened End by Tensile Drawing with Rupture

“…The absence of dependencies between the values of the shape change parameters , the magnitude of the strain force and the length of the heated part of the workpiece causes difficulties. Adjusting by the temperature and speed the deformation and the use of heat treatment makes it possible to obtain products with a sufficient degree of hardness and strength even in the presence of tensile stresses in the metal [27,28]. Simultaneous stretching of several workpieces is possible.…”

Peculiarities of Medium Carbon Steel Wire Microstructure Formation after Different Kinds of Deformational Processing

“…Mechanical scheme of deformation is unique for definite method of deformational processing and is characterized by schemes of main stresses and strains. The scheme of main stresses influence on metal mechanical properties (both strength and plastic) formation [5]. On the other hand the scheme of main stresses effects on grain size and microstructure formation of the processed metal.…”