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Study of Crystallographic Texture Evolution during High-Temperature Deformation of 18Cr-ODS Ferritic Steel based on Plasticity Assessment

Published online by Cambridge University Press:  25 July 2019

Manmath Kumar Dash ,
R. Mythili ,
Rahul John ,
S. Saroja  and
Arup Dasgupta
Manmath Kumar Dash*
Affiliation:
Metallurgy and Materials Group, Indira Gandhi Centre for Atomic Research, Pudupattinam, India IGCAR, HBNI, Kalpakkam-603102, India
R. Mythili
Affiliation:
Metallurgy and Materials Group, Indira Gandhi Centre for Atomic Research, Pudupattinam, India IGCAR, HBNI, Kalpakkam-603102, India
Rahul John
Affiliation:
Indian Institute of Technology Madras, Chennai-600036, India
S. Saroja
Affiliation:
Metallurgy and Materials Group, Indira Gandhi Centre for Atomic Research, Pudupattinam, India IGCAR, HBNI, Kalpakkam-603102, India
Arup Dasgupta
Affiliation:
Metallurgy and Materials Group, Indira Gandhi Centre for Atomic Research, Pudupattinam, India IGCAR, HBNI, Kalpakkam-603102, India
*
*Author for correspondence: Manmath Kumar Dash, E-mail: manmath@igcar.gov.in
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Abstract

This paper aims at understanding the texture evolution in extruded oxide dispersion strengthened 18Cr ferritic steel during high-temperature uniaxial compression testing at 1,423 K at a strain rate of 0.01/s based on extensive electron back scatter diffraction characterization. The α-fiber texture is observed along the extrusion direction (ED) in the initial microstructure. The flow curves generated during uniaxial compression test are used to determine the associated hardening parameters. In addition, the degree of texture evolution after deformation along the ED and the transverse direction (TD) with respect to the initial condition has been predicted using VPSC-5 constitutive model. The prediction shows that the deformation along the ED produces a dominant γ-fiber texture in contrast to the TD. This is in agreement with the experimental results where γ-fiber texture is observed, due to enhanced dynamic recrystallization at high-temperature deformation.

Keywords

EBSDpowder metallurgysteeltexture
Type
Materials Applications
Information
Microscopy and Microanalysis , Volume 25 , Issue 6 , December 2019 , pp. 1401 - 1406
Copyright
Copyright © Microscopy Society of America 2019 

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