An overview of flow patterns development on disc lower surfaces when processing by high-pressure torsion

Huang, Yi, Al-Zubaydi, Ahmed, Kawasaki, Megumi and Langdon, Terence G. (2014) An overview of flow patterns development on disc lower surfaces when processing by high-pressure torsion. Journal of Materials Research and Technology, 3, 303-310. (doi:10.1016/j.jmrt.2014.06.005).

Abstract

Stainless steel was selected to study the flow patterns developed with anvil misalignments of 100, 200 and 300 µm on the disc lower surfaces during processing by high-pressure torsion (HPT) through totals of up to 16 turns. A pair of anvils having a roughness of Ra ~ 15 µm was utilized to investigate the flow pattern development. Discs subjected to only compression in HPT exhibit similar characteristics to the as-received material in the phase domains and there were no overall curvatures of the austenitic (γ) and ferritic (α) phases. Double-swirl flow patterns were not observed in the 1 turn sample but they appeared on the disc lower surfaces after 5 and 16 turns with all three-anvil alignment conditions. There was no significant difference in the double-swirl configuration size for the 5 and 16 turns samples with different amounts of anvil misalignments. These results have important implications for processing metals by HPT.

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Contributors

Author: Yi Huang

Author: Terence G. Langdon

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