Journal
JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
Volume 44, Issue -, Pages 148-159Publisher
JOURNAL MATER SCI TECHNOL
DOI: 10.1016/j.jmst.2020.01.027
Keywords
Microstructural evolution; Plastic deformation; AISI 304 stainless steel; Pipe inner-surface grinding; Shear band
Funding
- Hundred Outstanding Creative Talents Projects in Hebei University, China
- Project Program of Heavy Machinery Collaborative Innovation Center, China
- National Natural Foundation of Hebei Province, China [E2018203312]
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In the present investigation, an austenitic AISI 304 stainless steel was subjected to high strain rate surface deformation by Pipe Inner-Surface Grinding (PISG) technique. The depth-dependent deformation parameters (strain, strain rate and strain gradient) were evaluated and the microstructures were systematically characterized. Microstructural evolution from millimeter- to nano-scale was explored, with special attention paid to the localized deformation. Microstructural evolution begins with the formation of planar dislocation arrays and the twin-matrix lamellae, which is followed by the localized deformation characterized by the initiation and the development of shear bands. A twinning-dominated process that was supplemented with dislocation slip-dominated one governed the microstructural evolution inside shear bands. The twin-matrix lamellae transform into extended/lamellar structure and finally the nanosized grains. Austenitic grains were substantially refined and martensitic transformation was effectively suppressed, of which the underlying mechanisms were analyzed. (C) 2020 Published by Elsevier Ltd on behalf of The editorial office of Journal of Materials Science & Technology.
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