Influence of SPD Process on Low-Carbon Steel Mechanical Properties

Abstract

Paper analyses the influence of different values of the angle of the deformation zone in the forming tool on severe plastic deformation (SPD) process and on mechanical properties of resulting steel strip. Forming equipment using the severe plastic deformation (SPD) process and DRECE (Dual Rolling Equal Channel Extrusion) method builded and installed in the laboratory for the development of new technologies at the Faculty of Mechanical Engineering of VSB -Technical University of Ostrava is described. Tests were carried out at selected low-carbon deep-drawing steel DC01. By magnetoelastic method the residual stresses in material after separate passes were analyzed. DRECE method of forming brings compression stress into the material, which is favorable for further use.

Effect of Processing Route on Microstructure and Microhardness of Low-Carbon Steel Subjected to Drece Process

“…As the number of passes increased, the average value of microhardness increased from 127 HV0.1 to 165 HV0.1 (after both 3rd and 4th passes), with values higher in the area below the upper surface, approximately 181 HV0.1. It is clear that when using the deformation route A, it is necessary to calculate with an uneven distribution of microhardness values, which corresponds to the theoretical conclusions presented in [5].…”

“…The DRECE method (Dual Rolls Equal Channel Extrusion) [4][5] is based on the principle of angular extrusion through an equilateral channel using contact friction between the extruded blank, in the form of a sheet metal strip, and feed rollers. Based on the generated friction force, the sheet is continuously extruded into a special forming tool, where it is intensively deformed by shear deformation as it passes through the deformation zone.…”

Influence of Drece Method on Mechanical Properties of Different Low Carbon Steel

“…and Kovona systém a.s.). The given steels will be formed by the DRECE (Dual Rolls Equal Channel Extrusion) method [9], which allows to achieve after the 1st pass through a special forming device a substantial increase in their mechanical properties, especially the yield strength Re while maintaining the required plasticity. The DRECE method, unlike the rolling process, preserves the original dimensions of the sheet metal strip, ie.…”

Microstructure evolution of az61 magnesium alloy processed by ecap method

“…Among the currently developed technologies of plastic deformation of metallic materials, severe plastic deformation (SPD) methods are worth to mention [5][6][7]. This plastic deformation technologies consists of transforming the micrometric structure of coarse-grained materials into ultra-fine (UFG with grain size in range of 100-1000 nm) and/or nanometric materials (grain size < 100 nm) by re-organizing the dislocation structure created during plastic deformation [8][9].…”