Annealing-Mediated Microduplex Structure and Texture Evolution in Severely Cold-Rolled Nanolamellar Pearlite: A Perspective on the Effect of Starting Inter-lamellar Spacing

Bhattacharjee, Pinaki Prasad (2023) Annealing-Mediated Microduplex Structure and Texture Evolution in Severely Cold-Rolled Nanolamellar Pearlite: A Perspective on the Effect of Starting Inter-lamellar Spacing. Metallurgical and Materials Transactions A, 54 (4). pp. 1199-1212. ISSN 1073-5623

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Abstract

The effect of inter-lamellar (IL) spacing on the microstructure and texture of severely cold-rolled and annealed pearlite was studied. For this purpose, the behavior of fine IL spacing starting material (FILSM) (~ 190 nm) was compared with a coarser IL spacing starting material (CILSM) (~ 275 nm). The materials were severely cold-rolled to 95 pct reduction in thickness and annealed at 973 K (700 °C) for different time intervals. Despite similarities in microstructural evolution featured by progressive alignment of the pearlitic colonies along the rolling direction (RD), bending and kink morphologies, fragmentation of cementite, and deformation-induced nanoscale structure, the FILSM showed a smaller nanoscale IL spacing (~ 45 nm) than CILSM (~ 60 nm) after severe cold-rolling. Both FILSM and CILSM showed similar deformation texture featured by the presence of typical ND (// [removed]) and RD (// [removed]) fibers. Annealing of the severely cold-rolled materials resulted in an ultrafine microduplex structure. However, annealed FILSM consistently showed lower ferrite and spheroidized cementite sizes than those in the annealed CILSM. Irrespective of the starting IL spacing, continuous recrystallization was found to be the softening mechanism, which was amply corroborated by the texture evolution during annealing. Therefore, although the starting IL spacing considerably affected the microstructure, the texture evolution remained largely unaffected. The tensile behavior of the microduplex structured FILSM was further analyzed considering Hall–Petch (H–P) and Orowan–Ashby (O–A) strengthening mechanisms.

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IITH Creators:

IITH Creators	ORCiD
Bhattacharjee, Pinaki Prasad	http://orcid.org/0000-0002-6422-2601

Item Type:

Article

Uncontrolled Keywords:

Annealing; Carbides; Metal cladding; Nanotechnology; Pearlite; Recrystallization (metallurgy); Textures; % reductions; Cold-rolled; Lamellar spacing; Nanoscale structure; Pearlitic colonies; Progressive alignment; Rolling direction; Structure evolution; Texture evolutions; Time interval; Cold rolling

Subjects:

Materials Engineering > Materials engineering
Materials Engineering > Nanostructured materials, porous materials

Divisions:

Department of Material Science Engineering

Depositing User:

Mr Nigam Prasad Bisoyi

Date Deposited:

24 Sep 2023 08:42

Last Modified:

24 Sep 2023 08:42

URI:

http://raiithold.iith.ac.in/id/eprint/11686