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Investigating Anvil Alignment and Anvil Roughness on Flow Pattern Development in High-Pressure Torsion

Published online by Cambridge University Press:  07 July 2016

Yi Huang ,
Megumi Kawasaki  and
Terence G. Langdon
Yi Huang
Affiliation:
Materials Research Group, Faculty of Engineering and the Environment, University of Southampton, Southampton SO17 1BJ, U.K.
Megumi Kawasaki
Affiliation:
Departments of Aerospace & Mechanical Engineering and Materials Science, University of Southern California, Los Angeles, CA 90089-1453, U.S.A. Division of Materials Science and Engineering, Hanyang University, Seoul 133-791, South Korea
Terence G. Langdon
Affiliation:
Materials Research Group, Faculty of Engineering and the Environment, University of Southampton, Southampton SO17 1BJ, U.K. Departments of Aerospace & Mechanical Engineering and Materials Science, University of Southern California, Los Angeles, CA 90089-1453, U.S.A.
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Abstract

High-pressure torsion (HPT) is a processing technique in which samples are subjected to a high pressure and torsional straining. Anvil alignment and anvil roughness are two important factors related to the successful application of the HPT processing technique. Using a two-phase duplex stainless steel as a model material, experiments were conducted by placing the anvils in different amounts of initial misalignment. Experiments show that the flow patterns (the development of double-swirl patterns) in HPT are dependent upon the alignment of the anvils within the HPT facility. Through carefully designed experiments, it is shown that the presence of a double-swirl is a feature of HPT processing when the initial positions of the anvils have a small lateral misalignment. The effect of the double-swirl patterns on the hardness evolution was also evaluated quantitatively. By comparing the flow patterns developed on the disc upper surface using both rough and smooth anvils with a fixed anvil misalignment, it was demonstrated that there are some differences in the flow patterns which are dependent upon the anvil surface roughness.

Keywords

HardnessMicrostructureSteel
Type
Articles
Information
MRS Online Proceedings Library (OPL) , Volume 1818 , 07 July 2016 , imrc2015s4g-p001
Copyright
Copyright © Materials Research Society 2016

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