PSI - Issue 42

Available online at www.sciencedirect.com Structural Integrity Procedia 00 (2019) 000 – 000 Available online at www.sciencedirect.com ^ĐŝĞŶĐĞ ŝƌĞĐƚ Structural Integrity Procedia 00 (2019) 000 – 000 Available online at www.sciencedirect.com ^ĐŝĞŶĐĞ ŝƌĞĐƚ

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Procedia Structural Integrity 42 (2022) 1361–1368

23 European Conference on Fracture - ECF23 Determination of ductile-to-brittle transition temperature of NIOMOL 490K steel welded joints Ana Maksimovic a *, Ljubica Milovic b , Bojana Zecevic a , Branislav Djordjevic c , Srdjan Bulatovic d , Vujadin Aleksic d 23 European Conference on Fracture - ECF23 Determination of ductile-to-brittle transition temperature of NIOMOL 490K steel welded joints Ana Maksimovic a *, Ljubica Milovic b , Bojana Zecevic a , Branislav Djordjevic c , Srdjan Bulatovic d , Vujadin Aleksic d

a Innovation Centre, Faculty of Technology and Metallurgy, 4 Karnegijeva St, 11120 Belgrade, Serbia b University of Belgrade, Faculty of Technology and Metallurgy, 4 Karnegijeva St, 11120 Belgrade, Serbia c Innovation Centre, Faculty of Mechanical Engineering, 16 Kraljice Marije St. 11120 Belgrade, Serbia d Institute for Testing of Materials- IMS Institute, 43 Bulevar Vojvode Mišića St.11040 Belgrade, Serbia a Innovation Centre, Faculty of Technology and Metallurgy, 4 Karnegijeva St, 11120 Belgrade, Serbia b University of Belgrade, Faculty of Technology and Metallurgy, 4 Karnegijeva St, 11120 Belgrade, Serbia c Innovation Centre, Faculty of Mechanical Engineering, 16 Kraljice arije St. 11120 Belgrade, Serbia d Institute for Testing of Materials- IMS Institute, 43 Bulevar Vojvode Mišića St.11040 Belgrade, Serbia

© 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 scientific committee of the 23 European Conference on Fracture – ECF23 © 2020 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/) Peer-review under responsibility of 23 European Conference on Fracture - ECF23 Keywords: Transition temperature, Mechanical properties, Niomol 490K Abstract This paper i voted to the ductile – brittle transition behavior of high strength l w lloyed structu l steel NIOMOL 490K. Th steel grade is designed for welded pre sure vessels exposed to dynamic loads, operating at t mperatures below zero, and that is why it must ave acceptable toughness. Due to its impo tance for the safety assessment of pr ssur vessels, a charact riz tion f his steel with Charpy V-notch t st range of temperature between-60 ⁰ C and +60 ⁰ C was ndertaken. Ductile-to-brittle transition temperatur curves were g nerated in the pres n study by using i strument d Charpy pendulum impact test on V-notch s ecimens. Notches were located in the parent material, heat-affected zo e and weld metal. The nil-ductility and t nsile properties in temperature range fr m - 60 ⁰C to +60 ⁰ C are pres nted in this paper. We used differen test temperatures to better understand ductile-to brittle transition response than just use either Charpy energy or other related ductility criteria. © 2020 The Authors. Published by Elsevier B.V. This is an ope acces article under the CC BY-N -ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/) Peer-review under responsibility of 23 European Conference on Fracture - ECF23 Keywords: Transition temperature, Mechanical properties, Niomol 490K Abstract This paper is devoted to the ductile – brittle transition behavior of high strength low alloyed structural steel NIOMOL 490K. This steel grade is designed for welded pressure vessels exposed to dynamic loads, operating at temperatures below zero, and that is why it must have acceptable toughness. Due to its importance for the safety assessment of pressure vessels, a characterization of this steel with Charpy V-notch test in range of temperature between-60 ⁰ C and +60 ⁰ C was undertaken. Ductile-to-brittle transition temperature curves were generated in the present study by using instrumented Charpy pendulum impact test on V-notch specimens. Notches were located in the parent material, heat-affected zone and weld metal. The nil-ductility temperature and tensile properties in temperature range from - 60 ⁰C to +60 ⁰ C are presented in this paper. We used different test temperatures to better understand ductile-to brittle transition response than just use either Charpy energy or other related ductility criteria.

* Corresponding author. Tel.: +381-69-3476-300 E-mail address: aprodanovic@tmf.bg.ac.rs * Corresponding author. Tel.: +381-69-3476-300 E-mail address: aprodanovic@tmf.bg.ac.rs

2452-3216 © 2020 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/) Peer-review under responsibility of 23 European Conference on Fracture - ECF23 2452-3216 © 2020 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/) Peer-review under responsibility of 23 European Conference on Fracture - ECF23

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 scientific committee of the 23 European Conference on Fracture – ECF23 10.1016/j.prostr.2022.12.173