PSI - Issue 23

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

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Procedia Structural Integrity 23 (2019) 577–582

© 2019 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 the scientific committee of the ICMSMF organizers © 201 9 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 the scientific committee of the IC MSMF organizers. Abstract Th paper prese ts the results of fatigue life tests 1.4539 austenitic steel welded joi ts made with the TIG metho and with laser beam aking i to con ideratio the number of cyc es to fracture initiation N i and in their developm nt conditions N R . A signifi ant influence f a shot peening process of he welded join s on fatigue life a d contributio of numb rs of cycles in the fracture course were shown. Analysis of fa igue fractures mi rofractography showed in the sho peened sp cimens a subsurface seconda y fractures parallel to the outer surface of the t s ed w lded joints. Tests on fatigue life and development of welded joints fractures were compared to analogical tests on the parent material. © 201 9 The Authors. Published by Elsevier B.V. This is an ope acces article under CC BY-NC-ND lic nse (http://creativecommon org/licenses/by-nc-nd/4.0/) Peer-review under responsibility of the scientific committee of the IC MSMF organizers. 9th International Conference on Materials Structure and Micromechanics of Fracture Initiation and development of 1.4539 austenitic steel welded joints made with TIG method and with laser beam Barbara Nasiłowska a * , Zdzisław Bogdanowicz b 9th International Conference on Materials Structure and Micromechanics of Fracture Initiation and development of 1.4539 austenitic steel welded joints made with TIG method and with laser beam Barbara Nasiłowska a * , Zdzisław Bogdanowicz b a ilit r i rsit f l , Institute f Optoelectronics, gen. S. Kaliskiego 2, 00-908, Warsaw b Military University of Technology, Faculty of Mechanical Engineering, gen. S. Kaliskiego 2, 00-908, Warsaw a Military University of Technology, Institute of Optoelectronics, gen. S. Kaliskiego 2, 00-908, Warsaw b Military University of Technology, Faculty of Mechanical Engineering, gen. S. Kaliskiego 2, 00-908, Warsaw Abstract The paper presents the results of fatigue life tests of 1.4539 austenitic steel welded joints made with the TIG method and with laser beam taking into consideration the number of cycles to fracture initiation N i and in their development conditions N R . A significant influence of a shot peening process of the welded joints on fatigue life and contribution of numbers of cycles in the fracture course were shown. Analysis of fatigue fractures microfractography showed in the shot peened specimens a development of subsurface secondary fractures parallel to the outer surface of the tested welded joints. Tests on fatigue life and development of welded joints fractures were compared to analogical tests on the parent material. 1. Introduction A characteristic feature for exploitation of the structure at a time variable stress is development of a destructive phenomenon, namely, material fatigue in the construction material. This multistage fatigue phenomenon influences a change of physical and mechanical properties of material in time, a change in the structure, element susceptibility to fracturing, development of fractures, which, consequently, results in limitation of the structure fatigue life (Kocańda (1996), Kocańda (1985)) . 1. Introduction A characteristic feature for exploitation of the structure at a time variable stress is development of a destructive phenomenon, namely, material fatigue in the construction material. This multistage fatigue phenomenon influences a change of physical and mechanical properties of material in time, a change in the structure, element susceptibility to fracturing, development of fractures, which, consequently, results in limitation of the structure fatigue life (Kocańda (1996), Kocańda (1985)) . Keywords: TIG, laser beam, welded joints, austenitic steel Keywords: TIG, laser beam, welded joints, austenitic steel

* Corresponding author. Tel.: +48 600 270 968 E-mail address: barbara.nasilowska@wat.edu.pl * Correspon ing author. Tel.: +48 600 270 968 E-mail address: barbara.nasilowska@wat.edu.pl

2452-3216 © 2019 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 the scientific committee of the IC MSMF organizers. 2452-3216 © 2019 The Authors. Published by Elsevier B.V. This is an ope acces article under CC BY-NC-ND lic nse (http://creativecommon org/licenses/by-nc-nd/4.0/)

Peer-review under responsibility of the scientific committee of the IC MSMF organizers.

2452-3216 © 2019 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 the scientific committee of the ICMSMF organizers 10.1016/j.prostr.2020.01.148