PSI - Issue 42

Available online at www.sciencedirect.com Structural Integrity Procedia 00 (2019) 000 – 000 tr t r l I t rit r i ( ) Available online at www.sciencedirect.com ^ĐŝĞŶĐĞ ŝƌĞĐƚ il l li t . i i t.

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ScienceDirect

Procedia Structural Integrity 42 (2022) 1497–1502

23 European Conference on Fracture - ECF23 Experimental Analysis of HSLA Steel Welded Joint Fracture Behaviour Ljubica Milovic a *, Aleksandar Sedmak b , Ivo Bla čić c , Tomaž Vuherer d , Blagoj Petrovski e L e

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a University of Belgrade, Faculty of Technology and Metallurgy, Karnegijeva 4, 11120 Belgrade, Serbia b University of Belgrade, Faculty of Mechanical Engineering, Kraljice Marije 16, 11120 Belgrade, Serbia b i it f l , lt f i l i i , lji ij , l , i

© 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 Abstract In order to assess the integrity of welded pressure vessel containing a crack, the behavior of three-point bending specimens made of HSLA steel welded joint are tested at -40 °C, and their fracture behaviour analyzed, as a conservative measure of crack resistance. Specimens were made of low-alloyed steel NIONIKRAL 70, welded by SAW process. Surface notches were machined by the electro-erosion method in the parent metal (PM), heat affected zone (HAZ) and weld metal (WM). The highest resistance to cracking was in PM, and the lowest one in WM, due to so-called pop-in behaviour. © 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: HSLA, SEM micrographs, welding, fracture 1. Introduction The most important advantages of high-strength low alloy (HSLA) steels compared to other construction steels are reduction in structures’ weight, increase in load capacity, service life extension and lower production costs. Because of their good weldability, HSLA steels are progressively used for fabricating of welded structures intended for demanding exploitation conditions. However, Gliha et al. (2004) point at one disadvantage of this type of steels, their susceptibility to brittleness during multi-pass welding because the fact that existence of local brittle zones reduces the load-carrying capacity of the welded joint (WJ) and may compromise the integrity of the whole welded structure. t t i t it l l t i i , t i t i t i i t l l j i t t t t , t i t i l , ti i t . i l ll t l , l . t i t l t i t i t t t l , t t l t l . i t i t t i i , t l t i , t ll i i . e t . li l i . . This is an open access article under the CC BY-NC-ND li tt :// ti . /li / / . / i i ilit t : , i r r , l i , fr t r . i t i t t t i t t l ll t l t t t ti t l ti i t t i t, i i l it , i li t i l ti t . t i l ilit , t l i l i ti l t t i t i l it ti iti . , li t l. i t t i t t i t t l , t i ti ilit t ittl i lti l i t t t t i t l l ittl t l i it t l j i t i t i t it t l l t t .

* Ljubica Milovic. Tel.: +381-63-8124-965; fax: +381-11-3370-387. E-mail address: acibulj@tmf.bg.ac.rs j i il i . l.: - - - ; f : - - - . - il : i lj t f. . .r

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 l i r . . i i rti l r t - - li ( tt :// r ti . r /li / - - / . /) i i ilit t - t r . li

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.2022.12.190