Optimizing continuous annealing of interstitial-free steels for improving deep drawability |
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Authors: | Pasi Juntunen Pentti Karjalainen Dierk Raabe Gerd Bolle Tero Kopio |
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Affiliation: | (1) the Materials Engineering Laboratory, Department of Mechanical Engineering, University of Oulu, Finland;(2) the Department of Microstructure, Max-Planck-Institut für Eisenforschung, 40237 Düsseldorf, Germany;(3) Product Applications, Strip Products, Rautaruukki Steel, Hameenlinna, Finland |
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Abstract: | The crystallographic textures and the resulting plastic anisotropy of five interstitial-free (IF) steels with different carbon equivalents and Nb and Ti microalloying content have been investigated. The steels were industrially hot rolled, cold rolled, annealed, and finally hot-dip galvanized. An alternative heat treatment of the cold rolled samples was conducted in laboratory scale using parameters close to those in industry-scale continuous annealing lines. The anisotropy parameters were both measured and predicted on the basis of the measured texture data. The calculated values were corrected by using functions that were fitted to the experimental data. It was found that for a given hot and cold rolling state even minor changes in the annealing conditions can improve the anisotropy parameter by up to 13 pct. Increase in recrystallization texture and improvement of the resulting anisotropy parameters are discussed in terms of partial transformation of ferrite to austenite in the intercritical regime. |
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