PSI - Issue 37

ScienceDirect Structural Integrity Procedia 00 (2021) 000 – 000 Structural Integrity Procedia 00 (2021) 000 – 000 Available online at www.sciencedirect.com Available online at www.sciencedirect.com ScienceD rect Available online at www.sciencedirect.com ScienceDirect

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Procedia Structural Integrity 37 (2022) 145–152

© 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 Pedro Miguel Guimaraes Pires Moreira Abstract The influence of quenching temperature on microstructural and mechanical properties of low alloy steel of the following chemical composition: 0.26 C, 1.70 Mn, 1.42 Si, 1.10 Cr, 1.10 Ni, 0.94 Cu, 0.24 Mo, 0.1 V, Bal. Fe (Wt.%) was investigated after applying a quenching-partitioning (Q-P) treatment. The steel samples were isothermally quenched at 260, 280, and 300 °C, from the austenitizing temperature and then Q-P treated at 340 °C. After the Q-P treatment, the steel showed a multiphase microstructure containing bainite, martensite, and retained austenite. It was determined that the tensile strength and Charpy impact energy increased with a decrease in quenching temperature to 1415 MPa and 43 J, respectively. This effect was attributed to an increase in the volume fraction of austenite/martensite micro blocks that introduces a hard phase mixture strengthening factor and the presence of tempered martensite, which is strengthened by fine particle dispersion and moreover, a decrease in thickness of the bainitic-ferrite subunits that refine the microstructure. The fractographic examination of the Charpy tested specimens showed that the sample quenched at 260 °C contained finer and deeper dimples, which indicates that more energy was spent on the nucleation and growth of ductile fracture microvoids, thus increasing the toughness. © 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 Pedro Miguel Guimaraes Pires Moreira Keywords: Advanced High Strength Steel; Quench and temper; Quenching-Partitioning treatment; strengthening mechanism Microstructural and Mechanical Properties of Advanced High Strength Low Carbon Steel After Quenching Partitioning Treatment E.Entezari a *, H. Mousalou b , S.Yazdani b , J.L. González-Velázquez a , J.A.Szpunar c a Department of Metallurgy and Materials, Escuela Superior de Ingeniería Química e Industrias Extractivas, Instituto Politécnico Nacional, Mexico City, Mexico, D.F. b Faculty of Materials Engineering, Sahand University of Technology, Tabriz, Iran c Department of Mechanical Engineering, University of Saskatc ewan, 57 Campus Drive, S7N5A9 Saskatoon, Saskatchewan, Canada Abstract The influence of quenching temperature on microstructural and mechanical properties of low alloy steel of the following chemical composition: 0.26 C, 1.70 Mn, 1.42 Si, 1.10 Cr, 1.10 Ni, 0.94 Cu, 0.24 Mo, 0.1 V, Bal. Fe (Wt.%) was investigated after applying a quench ng-partitioning (Q-P) treatment. The steel samples were isothermally quenched at 260, 280, and 300 °C, from the ustenitiz temperature and then Q-P treated at 340 °C. After th Q-P treatment, the st el showed a multiphase microstructur con aining bainite, ma t nsite, a d retained austenite. It was det rmined that the t n il trength nd Charpy i pact energy increased with a decre s in quenching temperature to 1415 MPa and 43 J, respectively. Thi effect was attributed to n incr ase the volume fraction of aust ite/mar nsite micro blocks that i troduces a hard phase mixture streng hening factor and th presence of t mpered marten ite, which is tr ngthened by fine particle dispersion and moreover, a d creas thickness of bainiti -ferri subunits that refine t e microstructur . The fractogr phic examination of the Charpy tested sp c mens showed that the sampl quenched at 260 °C contained fine and deeper dimples, which ind c es that more energy was nt on the nuclea ion and growth of ductile fracture microvoids, thus i creasing the toughness. © 2022 T e 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 u der re ponsibility of Pedro Miguel Guimara s Pires Moreira K ywords: Advanced High Strength Steel; Quench and temper; Quenching-Partitioning treatment; strengthening mechanism ICSI 2021 The 4th International Conference on Structural Integrity The Evaluation of Quenching Temperature Effect on ICSI 2021 The 4th International Conference on Structural Integrity The Evaluation of Quenching Temperature Effect on Microstructural and Mechanical Properties of Advanced High Strength Low Carbon Steel After Quenching Partitioning Treatment E.Entezari a *, H. Mousalou b , S.Yazdani b , J.L. González-Velázquez a , J.A.Szpunar c a Department of Metallurgy and Materials, Escuela Superior de Ingeniería Química e Industrias Extractivas, Instituto Politécnico Nacional, Mexico City, Mexico, D.F. b Faculty of Materials Engineering, Sahand University of Technology, Tabriz, Iran c Department of Mechanical Engineering, University of Saskatchewan, 57 Campus Drive, S7N5A9 Saskatoon, Saskatchewan, Canada

* Corresponding author. E-mail address: ehsan.entezari2014@gmail.com * Corresponding author. E-mail address: ehsan.entezari2014@gmail.com

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 Pedro Miguel Guimaraes Pires Moreira 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 u der responsibility of Pedro Miguel Guimara s Pires Moreira

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 Pedro Miguel Guimaraes Pires Moreira 10.1016/j.prostr.2022.01.070