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

Title
An overview of flow patterns development on disc lower surfaces when processing by high-pressure torsion
Author
Megumi Kawasaki
Keywords
Double-swirl; Flow pattern; High-pressure torsion; Stainless steel
Issue Date
2014-12
Publisher
ELSEVIER SCIENCE BV
Citation
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T, 권: 3(4), p.303-310
Abstract
Stainless steel was selected to study the flow patterns developed with anvil misalignments of 100, 200 and 300 mu m 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 approximate to 15 mu m 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 (gamma) and ferritic (alpha) phases. Doubleswirl 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. (C) 2014 Brazilian Metallurgical, Materials and Mining Association. Published by Elsevier Editora Ltda.
URI
https://www.sciencedirect.com/science/article/pii/S2238785414000520?via%3Dihubhttp://hdl.handle.net/20.500.11754/52550
ISSN
2238-7854; 2214-0697
DOI
10.1016/j.jmrt.2014.06.005
Appears in Collections:
COLLEGE OF ENGINEERING[S](공과대학) > MATERIALS SCIENCE AND ENGINEERING(신소재공학부) > Articles
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