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) 257–262

© 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 © 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. Keywords: Scanning electron microscope; low-cycle fatigue; numerical modeling of crack growth; fatigue crack growth rate; powder Ni-based alloy. Using the sc nning lectron microscope, information on the initiation and kinetics of the atigue cracks d velopment in th powder N -based superalloy EP741NP was obtain d. This alloy is used for th manufacture f GTE disks. The low-cycle fat gue test of cylindrical specimens was ca ried ut in the wide nge of t mperatures from 20 °C to 750 °C under strain control (fixed strain range) and different asymmetry ratios. The fractographic investigation f broken speci e s made it possible to determine the kinetics of the fatigue crack growth and dur bility, which also ma e it possible to determine the period of crack initiat on. After the fractograph c analysis, the mat ematical mode ing was carried out usin the ANSYS softw r , whic made it possible to det rmine th Paris parameters whi h are responsible for the growth of fatigue crack in this material. Th comparison of obtained p rameters with th Paris factors erived with standard procedu during the tests of CT specimens revealed the ismatch at high temperatures. The obtained information will enable to predict the durability of parts manufactured of this material. © 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. Keywords: Scanning electron microscope; low-cycle fatigue; numerical modeling of crack growth; fatigue crack growth rate; powder Ni-based alloy. 9th International Conference on Materials Structure and Micromechanics of Fracture The Influence of Temperature and Stress Cycle Asymmetry at Fatigue Cracks Initiation and Propagation in Cylindrical Specimens of Ni-based Alloy EP741NP M.A. Artamonov a *, D.V. Nemtsev a , V.E. Medentsov b , V.S. Solovyev b a A. Lyulka Design Bureau PJSC «UEC - Ufa Engine Industrial Association» Subsidiary , Kasatkina st., 13, Moscow 129301, Russia b Lytcarino Engineering Plant affiliate PJSC «UEC - Ufa Engine Industrial Association», promzona Turaevo, building 9, Lytcarino 140080, Russia Using the scanning electron microscope, information on the initiation and kinetics of the fatigue cracks development in the powder Ni-based superalloy EP741NP was obtained. This alloy is used for the manufacture of GTE disks. The low-cycle fatigue test of cylindrical specimens was carried out in the wide range of temperatures from 20 °C to 750 °C under strain control (fixed strain range) and different asymmetry ratios. The fractographic investigation of broken specimens made it possible to determine the kinetics of the fatigue crack growth and durability, which also made it possible to determine the period of crack initiation. After the fractographic analysis, the mathematical modeling was carried out using the ANSYS software, which made it possible to determine the Paris parameters which are responsible for the growth of fatigue crack in this material. The comparison of obtained parameters with the Paris factors derived with standard procedure during the tests of CT specimens revealed the mismatch at high temperatures. The obtained information will enable to predict the durability of parts manufactured of this material. 9th International Conference on Materials Structure and Micromechanics of Fracture The Influence of Temperature and Stress Cycle Asymmetry at Fatigue Cracks Initiation and Propagation in Cylindrical Specimens of Ni-based Alloy EP741NP M.A. Artamonov a *, D.V. Nemtsev a , V.E. Medentsov b , V.S. Solovyev b a A. Lyulka Design Bureau PJSC «UEC - Ufa Engine I dustrial Association» Subsidiary , K satkina st., 13, Moscow 129301, Russia b Lytcarino Engineering Plant affiliate PJSC «UEC - Ufa Engine Industrial Association», promzona Turaevo, building 9, Lytcarino 140080, Russia Abstract Abstract

* Corresponding author. Tel.: +7-499-755-08-44; fax: +7-495-683-09-97. E-mail address: maksim.artamonov@lmz.umpo.ru * Correspon ing author. Tel.: +7-499-755-08-44; fax: +7-495-683-09-97. E-mail address: maksim.artamonov@lmz.umpo.ru

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.2020.01.096