Work softening of drawn low carbon steel bars

Maria Teresa Paulino Aguilar,Waldemar Alfredo Monteiro,Paulo Roberto Cetlin,Nildemar Aparecido Messias Ferreira,Elaine Carballo Siqueira Corrêa

doi:10.1590/s1516-14392001000200008

Maria Teresa Paulino Aguilar, Waldemar Alfredo Monteiro + Show 3 more

Open Access

https://doi.org/10.1590/s1516-14392001000200008

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Abstract

The work hardening of metals subjected to complex processing paths is different from that in monotonic deformation. Changes in the deformation mode can promote transients in the strain-hardening rate, leading to anomalous softening or hardening of the material. This paper investigates the influence of strain path changes on the tensile behavior of drawn 0.12% steel rods. Annealed or predrawn specimens were submitted to cyclic twisting and then tested in tension. The results show that the cyclic deformation causes changes in the mechanical behavior of the metal, and the effect will depend on the previous "history" of the material. Cyclic twisting causes hardening in annealed samples, but leads to softening of the drawn bars. These phenomena are in line with the corresponding substructural aspects.

Highlights

The work hardening behavior of metals submitted to a sequential association of plastic deformation in various directions or of distinct natures is different from that in monotonic deformation
The present paper investigates the influence of cyclic torsion on the properties of annealed or drawn low carbon steel (0.12%C)
Pre-drawn bars subjected to cyclic torsion presented lower flow stresses and higher hardening rates than drawn samples

Summary

Introduction

The work hardening behavior of metals submitted to a sequential association of plastic deformation in various directions or of distinct natures is different from that in monotonic deformation. The present paper investigates the influence of cyclic torsion on the properties of annealed or drawn low carbon steel (0.12%C). Materials Research samples were directly submitted to cyclic torsion followed by tension, (c) some specimens were drawn in one or two passes and subjected to tensile test, and (d) pre-drawn bars (one or two passes) were submitted to cyclic torsion followed by tension.

Results

Conclusion