Influences of cell walls and grain boundaries on transient responses of an IF steel to changes in strain path. [Interstitial-free]
- Univ. of Birmingham (United Kingdom). School of Metallurgy and Materials
The effect of changes in strain path on plastic behavior in sheets of an interstitial-free steel with two widely different grain sizes were investigated. The sheets were prestrained in rolling and, apart from supplementary tests, they were tested in uniaxial tension at 90[degree] to the rolling direction. The results support the following conclusions. The magnitude of the increase in reloading yield stress and amplitude of the subsequent reduction in work hardening depend on the strength of dislocation walls generated in the prestrain rather than the grain size. The walls are more effective barriers to dislocation glide in freshly activated slip systems than to glide in the original slip systems operating in the prestrain. The primary cause of the subsequent reduction in hardening rate is disruption and partial dissolution of the original dislocation substructure. The final recovery in hardening rate is caused by generation of a new substructure compatible with the new deformation mode.
- OSTI ID:
- 5052973
- Journal Information:
- Acta Metallurgica et Materialia; (United States), Journal Name: Acta Metallurgica et Materialia; (United States) Vol. 42:4; ISSN 0956-7151; ISSN AMATEB
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
360102 -- Metals & Alloys-- Structure & Phase Studies
360103* -- Metals & Alloys-- Mechanical Properties
ALLOYS
DATA
ELECTRON MICROSCOPY
EXPERIMENTAL DATA
HARDENING
INFORMATION
IRON ALLOYS
IRON BASE ALLOYS
MECHANICAL PROPERTIES
MICROSCOPY
MICROSTRUCTURE
NUMERICAL DATA
PLASTICITY
STEELS
STRAIN HARDENING
TRANSMISSION ELECTRON MICROSCOPY