Step-by-step texture modification through strain path change toward improvement of the hardening capacity in a twinning-induced-plasticity steel

Akbarian, SH.; Zarei-Hanzaki, A.; Anoushe, A.S.; Abedi, H.R.; Unnikrishnan, R. and Cios, G. (2021). Step-by-step texture modification through strain path change toward improvement of the hardening capacity in a twinning-induced-plasticity steel. Materials Science and Engineering: A, 799, article no. 140269.

DOI: https://doi.org/10.1016/j.msea.2020.140269

Abstract

A novel texture analysis approach is aimed to elucidate the role of strain path change in extending the superior strain hardening capacity of a twinning-induced-plasticity steel up to the large compressive imposed strains at room temperature, in lights of step-by-step texture modification. In this context, activation of different deformation mechanisms during multi-axial forging (MAF) process is fully studied using macrotexture and microtexture analyses by means of calculating Schmid factors of slip and twinning. Synergetic development of deformation twin and dislocation substructure throughout the 1st MAF pass leads to exponential strain hardening rate. This is correlated with the formation of texture components with twin-favoring (near to <001>) and slip-favoring (near to <111> and <110>) orientations in each compression of one MAF pass. Such cooperation can also be reached for larger imposed strains during the 2nd MAF pass at ∑Ԑ = 2.4. However, it results in a steady-state flow behavior through continuous dynamic recrystallization stemming from turning dislocation cells of slip-favoring grains into the new ultrafine grains. This is phenomenal as can be understandable by recognizing the orientation dependency of dislocation substructures including Taylor lattice and dislocation cells as representatives for deformation twins and cross-slip, respectively. Having grains with dislocation cell and Taylor lattice respectively is the origin of facilitating restoration-based process and twinning activation, which modifies the texture by developing a twofold configuration in the course of imposing strain path change. As the second phase of this study, a detailed analyzation of subsequent mechanical responses of MAFed materials is focused through the room-temperature tensile and compression testing methods with the emphasis on the effect of pre-test microtexture on asymmetrical behavior. The shear-punch test is also used to prove the positive effect of recrystallized grains to enhance the mechanical properties.

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