PSI - Issue 48

Stefan Dikić et al. / Procedia Structural Integrity 48 (2023) 260 – 265 Dikić et al / Structural Integrity Procedia 00 (2019) 000 – 000

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 Micro-structure found in the base metal represented a balance mix of ferrite and pearlite, as expected, whereas a fine-grain ferritic-pearlite micro-structure was observed near the heat affected zone.  Heat affected zone consisted of mainly ferrite and pearlite near the fusion line, with larger grain size compared to the BM. Bainitic type micro-structures were also detected, but did not have any unusual effects on the results as a whole.  Weld metal was characterised by a dominantly pearlitic micro-structure, with bainitic morphologies While the above results indicated that there was nothing out of the ordinary when it comes to micro-structures in the welded specimens that were analysed, heat input did affect the width of the HAZ. Weld face HAZ widths were smaller than expected, due to decreased heat input, which was necessary in order to produce the required defects. As for the root HAZ width, the results were less uniform, due to different types of defects that were produced there, compared to the weld face. Acknowledgements This work was supported by the Ministry of Education, Science, and Technological Development of the Republic of Serbia (Contract No. 451-03-47/2023-01/200213). References [1] Kozak, D.; Konjatić, P.; Matejiček, F.; Damjanović , D. Weld misalignment influence on the structural integrity of cylindrical pressure vessel. Struct. Integr. Life 2010, 10, 153 – 159. [2] Cerit, M.; Kokumer, O.; Genel, K. Stress concentration effects of undercut defect and reinforcement metal in butt-welded joint. Eng. Fail. Anal. 2010, 17, 571 – 578. [3] Ottersböck, M.J.; Leitner, M.; Stoschka, M. Characterisation of actual weld geometry and stress concentration of butt welds exhibiting local undercuts. Eng. Struct. 2021, 240, 112266. [4] Aranđelović, M.; Sedmak, S.; Jovičić, R.; Kozak, D.; Đorđević, B. Numerical simulation of crack growth in a welded joint with defects. Procedia Struct. Integr. 2021, 33, 850 – 857. [5] Aranđelović, M.; Sedmak, S.; Jovičić, R.; Perković, S.; Burzić, Z.; Đorđević, B.; Radaković, Z. Numerical si mulation of welded joint with multiple various defects. Struct. Integr. Life 2021, 21, 103 – 107. [6] Aranđelović, M.; Sedmak, S.; Jovičić, R.; Perković, S.; Burzić, Z.; Radu, D.; Radaković, Z. Numerical and experimental invest igations of fracture behaviour of welded joints with multiple defects. Materials 2021, 14, 4832 [7] Aranđelović, M.; Petrović, A.; Đorđević, B.; Sedmak, S.; Sedmak, A.; Dikić, S.; Radu, D. Effects of Multiple Defects on Welde d Joint Behaviour under the Uniaxial Tensile Loading: Fem and Experimental Approach. Sustainability 2023, 15, 761. [8] Aranđelović, M.; Sedmak, S.; Jovičić, R.;Petrović, A. ; Dikić, S. Optimisation of numerical models of welded joints with mult iple defect combinations. Procedia Struct. Integr.2022, 42, 985-991. [9] Sedmak, S.; Jovičić, R.; Sedmak, A.; Aranđelović, M.; Đorđević, B. Influence of multiple defects in welded joints subjected to fatigue loading according to sist EN ISO 5817:2014. Struct. Integr. Life 2018, 18, 77 – 81. [10] Jovanović, G.; Glišić, D.; Dikić, S.; Radović, N.; Patarić, A. Cleavage Fracture of the Air Cooled Medium Carbon Microalloyed Forging Steels with Heterogeneous micro-structures. Materials 2022, 15, 1760. [11] Radović, N.; Vukicevic, G.; Glišić, D.; Dikić, S. Some Aspects of Physical Metallurgy of Microalloyed Steels . Metall Mater Eng 2020, 25, 247-263.