PSI - Issue 41

ScienceDirect Available online at www.sciencedirect.co ir t Structural Integrity Procedia 00 (2022) 000–000 Available online at www.sciencedirect.com Available online at www.sciencedirect.com ScienceDirect Structural Integrity Procedia 00 (2022) 000–000 Procedia Structural Integrity 41 (2022) 564–575

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2452-3216 © 2022 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 the MedFract2Guest Editors. 10.1016/j.prostr.2022.05.065 2452-3216 © 2022 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 the MedFract2Guest Editors. 2452-3216 © 2022 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 the MedFract2Guest Editors. © 2022 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 the MedFract2Guest Editors. Abstract The objective of this work is to study the hot ductility of (C-Mn-S-Al-Nb-V-Ti) micro-alloy steel of industrial production whose initial structural state is rolling stock. To simulate the thermomechanical treatments imposed we have deformed by pulling our samples after subjecting them to a solution treatment at 1200 °C and a precipitation treatment cycle before deformation. Hot deformations were carried out at temperatures from 700 °C and 1150 °C and deformation rates ranging between 10 -2 s -1 and 5.10 4 s -1 . The results show a decrease in hot ductility. Minimum values of hot ductility are determined at 800°C, and another decrease in hot ductility was observed at 900°C. Ferrite precipitation is observed at austenitic grain boundaries in the intercritical temperature range, causing intergranular embrittlement. Precipitation makes the hot ductility curve wider and deeper around 900°C. Hot ductility losses can explain by the presence of precipitates in the austenitic region and the presence of the two-phase structure in the intercritical region. Finally, based on experimental stress-deformation data, artificial neuron network (ANN) methods were used to predict flow stress of (C-Mn-S-Al-Nb-V-Ti) micro-alloy steel. This model is more effective in predicting flow stress and results can also be used in the mathematical simulation of hot metal formation processes. Keywords: Micro-alloyed steel; hot ductility; hot tensile; flow stress; ANN © 2022 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 the MedFract2Guest Editors Abdelmoumene Guedri a* , Abdelhalim Allaoui b , Lamia Darsouni c , and Abderrazek Darsouni c a Infra-Res Laboratory, Department of Mechanical Engineering, University of Souk Ahras, Souk Ahras, Algeria b Department of Mechanical Engineering, Abbes Laghrour University, Khenchela, Algeria c Foundry Laboratory, Badji Mokhtar University, Annaba, Algeria Abstract The obj ctive of t is work is to study the hot ductil ty of (C-Mn-S-Al-Nb-V-Ti) micro-alloy st el of industrial production who itial str tural st te is rolling stock. To simulate th therm mechanical treatments imposed we have deformed by pulling our sa les afte subje ting them to a solution trea ment at 1200 °C and a pr cipitati n treatment cycle before deformation. Hot deformati ns were carried out at temperatures from 700 °C and 1150 °C and deformation rates ranging b tween 10 -2 s -1 and 5.10 4 s -1 . Th results show a decrease i hot ductility. Minimum valu s of hot ductility are determined at 800°C, and anothe decrease in t ductility was observed at 900°C. Ferrite precipitation is observed at austenitic grain boundari s in the intercritical temperature range, causi g intergranular embrittl ent. Precipitation makes the h t ductility urv wider and deeper around 900°C. Hot ductility losses can explain by the presence of precipitates in the austenitic region and the presence of the two-phase structure in the intercritical region. Finally, based on experimental stress-deformation data, artificial neuron network (ANN) methods were used to predict flow stress of (C-Mn-S-Al-Nb-V-Ti) micro-alloy steel. This model is more effective in predicting flow stress and results can also be used in the mathematical simulation of hot metal formation processes. Keywords: Micro-alloyed steel; hot uctility; hot tensile; flow stress; ANN © 2022 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 the MedFract2Guest Editors T Abdelmoumene Guedri a* , Abdelhalim Allaoui b , Lamia Darsouni c , and Abderrazek Darsouni c a Infra-Res Laboratory, Department of Mechanical Engineering, University of Souk Ahras, Souk Ahras, Algeria b Department of Mechanical Engineering, Abbes Laghrour University, Khenchela, Algeria c Foundry Laboratory, Badji Mokhtar University, Annaba, Algeria * Corresponding author. Tel.: +213672831024. E-mail address: a.guedri@univ-soukahras.dz 2nd Mediterranean Conference on Fracture and Structural Integrity Hot Ductility Analysis and Flow Stress Prediction of (C-Mn-S-Al-Nb-V-Ti) Micro-alloyed Steel 2nd Mediterranean Conference on Fracture and Structural Integrity Hot Ductility Analysis and Flow Stress Prediction of (C-Mn-S-Al-Nb-V-Ti) Micro-alloyed Steel * Corresponding author. Tel.: +213672831024. E-mail address: a.guedri@univ-soukahras.dz