Abstract
The poor formability of warm rolled low carbon (LC) steels limits their use in deep drawing applications, which require acceptable r-values. Compression tests were conducted to study the effect of chromium content on rate sensitivity (m) using two experimental low carbon-chromium (LC-Cr) alloys and an extra low carbon (ELC) steel. A double dynamic strain ageing (DSA) peak was present in both LC-Cr alloyed steels, indicating that chromium affected the DSA behaviour at warm rolling temperatures. The chromium addition reduced m as compared to the ELC steel, increasing the shear band content of the warm rolled microstructures. This increased shear band content modified the type and distribution of the recrystallization nuclei after annealing. Thus, it is expected that warm rolled LC-Cr steels will have better formability than unmodified LC steels.
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