Journal
SCRIPTA MATERIALIA
Volume 159, Issue -, Pages 28-32Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.scriptamat.2018.09.007
Keywords
Yield point; Luders band; Plastic instability; Deformation induced martensitic transformation; Austenitic stainless steel; Ultra-fine grains
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Funding
- Elements Strategy Initiative for Structural Materials (ESISM) through the Ministry of Education, Culture, Sports, Science and Technology (MEXT), Japan
- Ministry of Education, Culture, Sports, Science and Technology (MEXT), Japan [15H05767]
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A remarkable Luders-type localized deformation having a huge Luders strain of 0.4 was observed in tensile deformation of an ultra-fine grained austenitic stainless steel fabricated by two-step cold rolling and annealing processes. It was clarified that the Luders-type deformation in the material was essentially the same as necking caused by plastic instability, but the enhanced strain hardening by deformation induced martensitic transformation realized the stable propagation of the strain localized band, leading to the huge Luders strain as well as high strength and large ductility of the material. (C) 2018 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
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