University of Oulu

Ali Khosravifard, Atef Hamada, Antti Järvenpää, Pentti Karjalainen, Enhancement of grain structure and mechanical properties of a high-Mn twinning-induced plasticity steel bearing Al–Si by fast-heating annealing, Materials Science and Engineering: A, Volume 795, 2020, 139949, ISSN 0921-5093,

Enhancement of grain structure and mechanical properties of a high-Mn twinning-induced plasticity steel bearing Al–Si by fast-heating annealing

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Author: Khosravifard, Ali1; Hamada, Atef2; Järvenpää, Antti2;
Organizations: 1Metallurgical and Materials Engineering Department, School of Engineering, Shiraz Branch, Islamic Azad University, Box 71993-1, Shiraz, Iran
2Kerttu Saalasti Institute, University of Oulu, Pajatie 5, 85500, Nivala, Finland
3Centre for Advanced Steels Research, University of Oulu, Box 4200, 90014, Oulu, Finland
Format: article
Version: accepted version
Access: open
Online Access: PDF Full Text (PDF, 1.7 MB)
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Language: English
Published: Elsevier, 2020
Publish Date: 2022-07-23


In this study, a cold-rolled Fe-0.01C-21.3Mn–3Al–3Si (wt.%) TWIP steel was undergone a fast-heating (FH) annealing at high temperatures of 1000–1200 °C and 2 s soaking time for grain refinement and controlling the phase structure and thereby to enhance the mechanical properties. For comparison, recrystallization annealing was conducted at lower temperatures of 650 and 700 °C for 180 s. The microstructural evolution of the FH annealed steel was surveyed using electron backscatter diffraction. The strain hardening behavior of the FH structures was studied by tensile tests. The tensile flow curves were also predicted by a phenomenological model based on the evolution of dislocation density during deformation. Fine mainly austenitic structure was promoted by FH annealing at 1000 and 1100 °C. At the lower temperatures of 650 and 700 °C, bands of finer grains, indicative of some inhomogeneity, were evident in the mostly austenitic recrystallized microstructure. However, at 1200 °C, the structure consisted of coarse austenite and ferrite with almost equal fractions. The FH annealed structures exhibited a remarkable improvement in the mechanical properties (a better combination of yield and tensile strength and ductility) compared to conventional long annealing cycles.

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Series: Materials science & engineering. A, Structural materials: properties, microstructure and processing
ISSN: 0921-5093
ISSN-E: 1873-4936
ISSN-L: 0921-5093
Volume: 795
Article number: 139949
DOI: 10.1016/j.msea.2020.139949
Type of Publication: A1 Journal article – refereed
Field of Science: 216 Materials engineering
Funding: PK expresses his gratitude to the Academy of Finland for funding this research under the auspices of the Genome of Steel (Profi3) through project #311934.
Copyright information: © 2020 Elsevier B.V. This manuscript version is made available under the CC-BY-NC-ND 4.0 license