The texture development and c-fibre recrystallisation texture formation mechanism of ferritic stainless steels under different rolling processes were investigated. It was shown that the surface texture development was absolutely different from the centre texture development. In conventional rolled band, strong a-fibre was formed at the centre layer and it was weakened after hot band annealing; after cold rolling, the centre texture was characterised by sharp a-fibre and weak c-fibre with a peak at {111},110., and non-uniform c-fibre recrystallisation texture was developed. By contrast, in warm rolled band, the centre texture consisted of weakened a-fibre and sharpened c-fibre, and {111},112. became the prominent component after hot band annealing. The a-fibre and c-fibre with a peak at {111},112. were intensified at the centre texture after cold rolling, resulting in the formation of uniform c-fibre recrystallisation texture. It was indicated that the formation mechanism of c-fibre recrystallisation texture was closely dependent on hot rolling process.
In this work, the 18Cr–2Mo ferritic stainless steel was treated with and without warm rolling at 573 K with 66.5 reduction after conventional hot rolling process. It was shown that ductile-to-brittle transition behaviour could be closely related to deformation twinning and parameters affecting critical temperature for twinning would also inevitably affect ductile-to-brittle transition temperature. This correlation between ductile-to-brittle transition behaviour and twinning was in good agreement with the Cottrell–Petch model. A lowered transition temperature and an improved toughness after introducing warm rolling process and corresponding annealing process could be mainly explained in terms of refining the recrystallised grains and reducing the volume fraction of grains having orientations favourable for twinning, which decrease the critical temperature at which twins form.
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