A micro-mechanism to explain the post-DRX grain growth at temperatures >0.8Tm

A micro-mechanism responsible for the occurrence of post-dynamic recrystallization (DRX) grain growth during deformation at T>0.8Tm is described. Thermo-mechanical testing, microstructural characterization and diffraction studies reveal the link between slip and grain growth. If deformation is im...

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Bibliographic Details
Published in:Materials characterization 2018-02, Vol.136, p.100-110
Main Authors: Aashranth, B., Samantaray, Dipti, Arvinth Davinci, M., Murugesan, S., Borah, Utpal, Albert, Shaju K., Bhaduri, A.K.
Format: Article
Language:English
Subjects:
AUSTENITIC STEELS
DEFORMATION
DIFFRACTION
GRAIN GROWTH
GRAIN SIZE
MATERIALS SCIENCE
MECHANICAL PROPERTIES
MECHANICAL TESTS
RECRYSTALLIZATION
ROTATION
SLIP
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Summary:A micro-mechanism responsible for the occurrence of post-dynamic recrystallization (DRX) grain growth during deformation at T>0.8Tm is described. Thermo-mechanical testing, microstructural characterization and diffraction studies reveal the link between slip and grain growth. If deformation is imparted in a single stage, grains grow by a cooperative growth process involving grain rotation and alignment of slip planes. This mechanism changes when deformation is interrupted and controlled intermediate soaking is performed before re-loading. A premeditated control of mechanism is shown to yield favourable microstructural and mechanical properties. A strategy to apply this control to industrial hot deformation is outlined. [Display omitted] •Austenitic grain growth during working at temperature >0.8Tm is reduced by >50%.•Growth mechanism during loading is distinct from growth in absence of loading.•During loading, growth occurs due to alignment of slip planes and grain merging.•Interruption of loading causes competitive growth and limits grain size.•Interrupted loading results in optimal microstructural and mechanical properties.
ISSN:1044-5803
1873-4189
DOI:10.1016/j.matchar.2017.12.010