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Characterization of the texture evolution in AISI 430 and AISI 433 ferritic stainless steels during simulated hot rolling

Published online by Cambridge University Press:  29 April 2018

K. A. Annan ,
C.W. Siyasiya  and
W.E. Stumpf
K. A. Annan*
Affiliation:
Department of Materials Science and Metallurgical Engineering, University of Pretoria0002, South Africa.
C.W. Siyasiya
Affiliation:
Department of Materials Science and Metallurgical Engineering, University of Pretoria0002, South Africa.
W.E. Stumpf
Affiliation:
Department of Materials Science and Metallurgical Engineering, University of Pretoria0002, South Africa.
*
*Corresponding author: KA Annan, e-mail: kofi.annan@up.ac.za
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Abstract

Multi-pass compression tests were carried out on the Gleeble-1500D® and Gleeble-3800TM® thermo-mechanical simulators to investigate the effect of temperature, strain rate and inter-pass time on the development of the texture in ferritic stainless steels (FSS) AISI 430 and 433, the latter an Al-containing variant. Orientation Distribution Functions (ODFs) through the electron backscattered diffraction (EBSD) technique was employed to characterise and study the texture present in the steels after hot working. The mean flow stress analysis showed that, the dynamic recrystallization to dynamic recovery transition temperature decreases with an increase in strain rate in both grades of stainless steels possibly allowing texture optimisation at lower hot rolling temperatures. Higher finishing rolling temperatures, lower strain rates and longer inter-pass times led to improvement in the formation of the desired γ-fibre texture which contributes to ductility or drawability in these steels. Dynamic recrystallization which promotes the formation of the desired γ-fibre texture was found to occur in both AISI 430 and 433 at temperatures above 1000 °C and strain rates less than 5 s-1. Generally AISI 433 develops a stronger gamma texture than the AISI 430 when hot rolled under similar conditions.

Keywords

crystallizationmicrostructurescanning electron microscopy (SEM)texture
Type
Articles
Information
MRS Advances , Volume 3 , Issue 34-35: African Materials Research Society 2017 , 2018 , pp. 1985 - 2002
Copyright
Copyright © Materials Research Society 2018 

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