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Texture Evolution during Direct and Reversed Hot Torsion Tests of Stabilized Ferritic Stainless Steels

Abstract : The study was carried out to understand the mechanisms occurring during the direct (negative shear direction) and reversed (positive shear direction) hot torsion of 11% chromium stabilized ferritic stainless steels. The behaviours induced by various types of stabilization, i.e., when either niobium, or titanium, or both niobium and titanium are used were compared. It was observed that continuous dynamic recrystallization (CDRX) operates in all materials starting at the onset of straining. Niobium has a more pronounced influence on hardening than titanium during hot deformation, which is due to solid solution strengthening and also to the reduction or stopping of grain boundary migration by solute drag effect. The D2 component, {-1-12} < 111 > , was the major texture component at the steady state for the torsion tests carried along the negative shear direction. It was likely to be formed by a combination of strain and the growth of grains exhibiting both low stored energy and low rotation rate of the crystallographic axes. After reversion of the shear direction, i.e. during positive shear, the above major texture component is gradually changed into the D1 component, {11-2} < 111 > . Using the CMTP method (Continuum Mechanics of Textured Polycrystals), the stress evolution is explained by the volume fraction changes of each component at various strains, associated with their respective Taylor factors. Such simplified approach leads to a good agreement with experimental results.
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Submitted on : Monday, July 26, 2010 - 12:43:15 PM
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Tarcisio Reis de Oliveira, Frank Montheillet. Texture Evolution during Direct and Reversed Hot Torsion Tests of Stabilized Ferritic Stainless Steels. Materials Science Forum, Trans Tech Publications Inc., 2005, 495 - 497, pp.477-482. ⟨10.4028/⟩. ⟨emse-00505826⟩



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