Abstract
Multipass torsion tests were used to investigate the warm-rolling behavior of three interstitial free (IF) steels containing Ti and/or Nb. All the tests were carried out at a strain rate of 2 s−l, and the samples were water-quenched immediately after particular passes. Whereas the finishing passes were always executed in the single-phase ferrite region, the roughing passes were applied either in the austenite phase (hot/warm-rolling) or in the ferrite region (warm/warm-rolling). In the former case, the temperature of the first roughing pass was 1260 °C while it was 850 °C for the warm/warm method. It is shown that dynamic recrystallization occurs to a degree that depends on the composition of the steel and the finishing temperature. Although the finish-rolling loads for warm-rolling (in the ferrite region) are no higher than for conventional strip-rolling in the austenite region, the ultrafine ferrite grain sizes of 1 to 2 μm that are produced by warm-rolling are an order of magnitude finer than those resulting from conventional processing.
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Najafi-Zadeh, A., Jonas, J.J. & Yue, S. Grain refinement by dynamic recrystallization during the simulated warm-rolling of interstitial free steels. Metall Trans A 23, 2607–2617 (1992). https://doi.org/10.1007/BF02658064
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DOI: https://doi.org/10.1007/BF02658064