Orientation Dependent Recovery in Interstitial Free Steel

Cold rolled (40, 60 and 80% thickness reductions from hot-band) interstitial free (IF) steel samples were recovered at 500°C for different times (15 min to 32 h). The recovery kinetics, studied through a combination of X-ray line profile analysis and high resolution electron diffraction, were best r...

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Bibliographic Details
Published in:ISIJ International 2012, Vol.52(5), pp.884-893
Main Authors: Khatirkar, Rajesh, Vadavadagi, Basavaraj, Shekhawat, Satish Kumar, Haldar, Arunansu, Samajdar, Indradev
Format: Article
Language:English
Subjects:
Applied sciences
dislocations
Exact sciences and technology
IF steel
line profile analysis
Metals. Metallurgy
misorientation
recovery
SIBM
strain localizations
X-ray diffraction
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Summary:Cold rolled (40, 60 and 80% thickness reductions from hot-band) interstitial free (IF) steel samples were recovered at 500°C for different times (15 min to 32 h). The recovery kinetics, studied through a combination of X-ray line profile analysis and high resolution electron diffraction, were best represented by logarithmic relationship. Though the kinetics was dependent on the prior deformation, γ (ND// ) fibre clearly had stronger recovery than θ (ND// ) fibre. Recovery was observed, statistically to create grain interior strain localizations: an orientation independent phenomenon. Increase in misorientation across such strain localizations was, however, orientation dependent. This was responsible for enhanced in-grain misorientation in recovered γ-fibre grains/bands. Extended recovery of 80% pre-deformed samples also led to coarsening of γ-fibre bands: strain induced boundary migration (SIBM) or uniform movement of γ-fibre boundaries into neighbouring non γ-fibre orientations.
ISSN:0915-1559
1347-5460
DOI:10.2355/isijinternational.52.884