A comparative study of precipitation effects in Ti only and Ti–V Ultra Low Carbon (ULC) strip steels

Two ULC steel grades were investigated, one based on combined vanadium and titanium additions and the other based on titanium only additions. It has been established that TiC formation during interphase precipitation retards grain growth of the {111} texture grains during continuous annealing and he...

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Bibliographic Details
Published in:Materials characterization 2006-04, Vol.56 (3), p.214-226
Main Authors: Ooi, S.W., Fourlaris, G.
Format: Article
Language:English
Subjects:
ANNEALING
CARBON STEELS
Cross-disciplinary physics: materials science
rheology
DISLOCATIONS
Exact sciences and technology
GRAIN GROWTH
HARDENING
MATERIALS SCIENCE
Microscopy
MICROSTRUCTURE
Phase diagrams and microstructures developed by solidification and solid-solid phase transformations
Physics
PRECIPITATION
Solidification
Thermodynamic modelling
TITANIUM ADDITIONS
TITANIUM CARBIDES
Titanium–vanadium steels
Ultra low carbon steels
VANADIUM ADDITIONS
YIELD STRENGTH
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Summary:Two ULC steel grades were investigated, one based on combined vanadium and titanium additions and the other based on titanium only additions. It has been established that TiC formation during interphase precipitation retards grain growth of the {111} texture grains during continuous annealing and hence positively affects the r value of the Ti only steel. The formation of newly formed TiC precipitates on dislocations during continuous annealing has been found to result in an increase of the yield strength in both steel grades, as the annealing temperature is increased. It is also confirmed that VC particles formed during the coiling process dissolve during the continuous annealing cycles. Suitable continuous annealing cycles can be adopted to produce high formable steels with a bake hardening potential using the beneficial effects of combined Ti–V additions.
ISSN:1044-5803
1873-4189
DOI:10.1016/j.matchar.2005.11.010