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- Title
Microstructural evolution during batch annealing of boron containing aluminum-killed steel.
- Authors
Deva, Anjana; Jha, B.; Mishra, N.
- Abstract
Role of boron in low carbon aluminum-killed cold rolled batch annealed steels has been critically examined. It was found that it is not the absolute boron but B/N ratio that controls the forming properties. Pancake shaped grains (high grain shape anisotropy) are highly desirable for improving the desirable {111} texture, normal anisotropy, and draw ability of the steel sheets. Microstructural analysis showed that the extent of pancaking decreases with increase in B/N atomic ratio and reaches ultimately to formation of equiaxed grains. Low B/N ratio (upto 0.3) resulted in improved mean plastic anisotropy ratio ( rm) value and high grain shape anisotropy, which has been characterized through grain aspect ratio. The desirable orientation in steel with low B/N ratio is attributed to sufficient availability of Al and N to precipitate during batch annealing. Optimum amount of boron, aluminum, and nitrogen in steel has resulted in coarse pancake structure, which is ideally suited for improved formability.
- Subjects
MICROSTRUCTURE; ANNEALING of crystals; BORON; ALUMINUM; STEEL; ANISOTROPY; NITROGEN content of steel
- Publication
Journal of Materials Science, 2009, Vol 44, Issue 14, p3736
- ISSN
0022-2461
- Publication type
Article
- DOI
10.1007/s10853-009-3499-3