Effect of microstructure and texture on the evolution of mechanical properties in a cold rolled and annealed UNS S32101 lean duplex stainless steel sheet

Dandekar, TR and Kumar, A and Khatirkar, RK and Kumar, D and Suwas, S (2023) Effect of microstructure and texture on the evolution of mechanical properties in a cold rolled and annealed UNS S32101 lean duplex stainless steel sheet. In: Materials Chemistry and Physics, 299 .

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Abstract

In the present investigation, the effect of microstructure and texture on the evolution of mechanical properties during recrystallization for 80 unidirectionally cold rolled UNS S32101 lean duplex stainless steel (LDSS) sheet was investigated. Microstructures were observed using an optical microscope (OM), scanning electron microscope (SEM) and electron backscattered diffraction (EBSD), while the bulk texture was measured by X-ray Diffraction (XRD). Cold rolled samples showed Brass-type texture for austenite and strong α-fiber texture (rolling direction, RD//<110>)/γ-fiber texture (normal direction, ND//<111>) for ferrite. After 80 cold rolling, strain-induced martensite (α′, SIM) was formed from austenite (γ). However, with the increase in annealing time, γ fraction increased due to the reversion of α’ to γ. The morphology of grains changed from lamellar to near globular as the annealing time increased. The crystallographic texture weakened after recrystallization for both austenite and ferrite. A sharp decrease in stored energy (275 kJ/m3 to 650 J/m3 (austenite) and 293 kJ/m3 to 520 J/m3 (ferrite)) and hardness was observed as the recrystallized fraction of ferrite and austenite increased. After annealing for 2 min and greater, hardness reached a constant value of ∼180 ± 5 Hv. R‾ and ΔR calculated from tensile tests increased with an increase in annealing time due to coarsening of microstructure and texture development. © 2023 Elsevier B.V.

Item Type:	Journal Article
Publication:	Materials Chemistry and Physics
Publisher:	Elsevier Ltd
Additional Information:	The copyright of this article belongs to Elsevier Ltd.
Keywords:	Annealing; Austenite; Coarsening; Cold rolling; Ferrite; Formability; Hardness; Metal cladding; Morphology; Recrystallization (metallurgy); Scanning electron microscopy; Stainless steel; Steel sheet; Tensile testing; Annealing time; Cold-rolled; Electron back-scattered diffraction; Fiber texture; Lean duplex stainless steel; Microscope scanning; Optical microscopes; Recrystallisation; Scanning electrons; Stainless steel sheets; Textures
Department/Centre:	Division of Mechanical Sciences > Materials Engineering (formerly Metallurgy)
Date Deposited:	12 Mar 2023 05:51
Last Modified:	12 Mar 2023 05:51
URI:	https://eprints.iisc.ac.in/id/eprint/80908

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