PSI - Issue 68

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Available online at www.sciencedirect.com Structural Integrity Procedia 00 (2025) 000–000 Available online at www.sciencedirect.com ScienceDirect Structural Integrity Procedia 00 (2025) 000–000 ScienceDirect

www.elsevier.com/locate/procedia

ScienceDirect

Procedia Structural Integrity 68 (2025) 581–587

European Conference on Fracture 2024 Enhancement of Mechanical Properties of high-Mn TWIP Steel with Fast Heating process: Insights into Microstructural Evolution and Performance Optimization Atef Hamada a,* , Ali Khosravifard b , Matias Jaskari a , Antti Järvenpää a , Mahmoud Khedr a,c a Future Manufacturing Technologies FMT, Kerttu Saalasti Institute, University of Oulu, Pajatie 5, 85500 Nivala, Finland b Department of Materials and Metallurgical Engineering, Abadeh Higher Education Center, Shiraz University, Abadeh, 73916, Iran c c Mechanical Engineering Department, Faculty of Engineering at Shoubra, Benha University, Cairo 11629, Egypt. Abstract This study explores the impact of fast heating (FH) technique on the microstructural evolution of heavily cold-rolled TWIP steel, focusing on the temperature range of 1000-1200°C for a duration of 5 seconds. Utilizing a Gleeble 3600 simulator, FH experiments were characterized by rapid heating rates of 500°C/s and cooling rates of 400°C/s. The promoted microstructures were analyzed using Electron Backscatter Diffraction (EBSD), while mechanical properties were evaluated through microhardness measurements and uniaxial tensile tests. The results revealed that the FH process promotes a fully recrystallized microstructure. At 1000°C, this FH cycle yields an ultrafine-grained structure with an average grain size of approximately 2.5 µm, which synergistically enhances both tensile strength (750 MPa) and extreme ductility (105%). However, the FH cycle at 1200°C results in a coarser-grained structure with an average grain size of about 20 µm. This microstructure, while reducing tensile strength to 650 MPa, significantly increases ductility to 120%. These findings illustrate a valuable synergy between FH parameters and microstructural development, offering a strategic approach to optimizing the mechanical performance of TWIP steels. © 2025 The Authors. Published by ELSEVIER B.V. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0) Peer-review under responsibility of ECF24 organizers European Conference on Fracture 2024 Enhancement of Mechanical Properties of high-Mn TWIP Steel with Fast Heating process: Insights into Microstructural Evolution and Performance Optimization Atef Hamada a,* , Ali Khosravifard b , Matias Jaskari a , Antti Järvenpää a , Mahmoud Khedr a,c a Future Manufacturing Technologies FMT, Kerttu Saalasti Institute, University of Oulu, Pajatie 5, 85500 Nivala, Finland b Department of Materials and Metallurgical Engineering, Abadeh Higher Education Center, Shiraz University, Abadeh, 73916, Iran c c Mechanical Engineering Department, Faculty of Engineering at Shoubra, Benha University, Cairo 11629, Egypt. Abstract This study explores the impact of fast heating (FH) technique on the microstructural evolution of heavily cold-rolled TWIP steel, focusing on the temperature range of 1000-1200°C for a duration of 5 seconds. Utilizing a Gleeble 3600 simulator, FH experiments were characterized by rapid heating rates of 500°C/s and cooling rates of 400°C/s. The promoted microstructures were analyzed using Electron Backscatter Diffraction (EBSD), while mechanical properties were evaluated through microhardness measurements and uniaxial tensile tests. The results revealed that the FH process promotes a fully recrystallized microstructure. At 1000°C, this FH cycle yields an ultrafine-grained structure with an average grain size of approximately 2.5 µm, which synergistically enhances both tensile strength (750 MPa) and extreme ductility (105%). However, the FH cycle at 1200°C results in a coarser-grained structure with an average grain size of about 20 µm. This microstructure, while reducing tensile strength to 650 MPa, significantly increases ductility to 120%. These findings illustrate a valuable synergy between FH parameters and microstructural development, offering a strategic approach to optimizing the mechanical performance of TWIP steels. © 2025 The Authors. Published by ELSEVIER B.V. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0) Peer-review under responsibility of ECF24 organizers © 2025 The Authors. Published by ELSEVIER B.V. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0) Peer-review under responsibility of ECF24 organizers

Keywords: High-Mn TWIP steel; fast heating; recrystallization; microstructure; mechanical properties.

* Corresponding author. Tel.: +358 294 48 0000. E-mail address: atef.hamadasaleh@oulu.fi * Corresponding author. Tel.: +358 294 48 0000. E-mail address: atef.hamadasaleh@oulu.fi

2452-3216 © 2025 The Authors. Published by ELSEVIER B.V. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0) Peer-review under responsibility of ECF24 organizers 2452-3216 © 2025 The Authors. Published by ELSEVIER B.V. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0) Peer-review under responsibility of ECF24 organizers

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