Abstract

ANNAN, K.A.; SIYASIYA, C.W.  and  STUMPF, W.E.. Effect of hot rolling conditions on ridging in 16wt% Cr ferritic stainless steel sheet. J. S. Afr. Inst. Min. Metall. [online]. 2013, vol.113, n.2, pp.91-96. ISSN 2411-9717.

The last seven hot rolling passes of the ferritic stainless steel AISI 430 were simulated on a Gleeble-1500D^® thermo-mechanical simulator to investigate the effect of temperature, strain rate, and interpass time on the texture. The compression tests were carried out over a wide range of strain rates (0.1 s^-1 to 5 s^-1) and temperatures (1100°C to 820°C) with different interpass times (2, 10, 20, and 30 seconds). The dynamic recrystallization to dynamic recovery transition temperature was determined from examining the relationship between the mean flow stress and the inverse of the deformation temperature in multi-pass tests. It was found that the texture in the central layer of the compressed sample is a strong recrystallization-type. The through-thickness textural and microstructural banding, to a large extent, were found to be weakened by hot deformation in the two-phase (α + γ) region, as opposed to the single-phase (α) region.

Keywords : ferritic stainless steel; electron backscattering diffraction (EBSD); hot rolling; dynamic recovery; dynamic recrystallization.

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