PSI - Issue 20

Available online at www.sciencedirect.com Available online at www.sciencedirect.com ScienceDirect Structural Integrity Procedia 00 (2018) 000–000 Available online at www.sciencedirect.com ScienceDirect Structural Integrity Procedia 00 (2018) 000–000

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ScienceDirect

Procedia Structural Integrity 20 (2019) 57–62

1st International Conference on Integrity and Lifetime in Extreme Environment (ILEE-2019) Cold resistance of materials as an integrity factor of railway transport in the Extreme environment Valeriy Lepov a,b, *, Albert Grigoriev a , Valentina Achikasova a , Kyunna Lepova a a Larionov’s Institute of Pysical-Technical Problems of the North SB RAS, 1 Oktyabrskaja str., 677891, Yakutsk, Russia b Academy of Science of Republic of Sakha (Yakutia), 33 Lenina av., 677007, Yakutsk, Russia The integrity of structures and responsible units of railway transport in Extreme environment depends on the efficiency materials such as locomotive and rail steels at low temperature. Understanding of materials and structures behavior under the impact loading it is necessary to improve the characteristics and reliability of all railway transport. So the study of locomotive steel fracture mechanism at low temperature has been carried out. The optical and electron microscopy used to study the fracture surface of impact toughness test samples. The analysis reveals the sources of the radial fracture pattern. In case of locomotive wheel bandage it is the globular particle located in the steel grains. It is obvious that the spheroidization of non-metal imperfection happens under the thermal influence during the variable cyclic loading over the operation time. The stochastic modeling shows the high susceptibility of the crack growth velocity to structural size. So the problem of low reliability and lifetime could be solved by improving the impact toughness ant low temperature through the thermal and mechanical processing of steel and microalloying with refractory and rare-earth element compositions. 1st International Conference on Integrity and Lifetime in Extreme Environment (ILEE-2019) Cold resistance of materials as an integrity factor of railway transport in the Extreme environment Valeriy Lepov a,b, *, Albert Grigoriev a , Valentina Achikasova a , Kyunna Lepova a a Larionov’s Institut of Pysi al-T chnical Problems of the North SB RAS, 1 Oktyabrskaja str., 677891, Y kutsk, Russia b Academy of Science of Republic of Sakha (Yakutia), 33 Lenina av., 677007, Yakutsk, Russia Abstract The integrity of structures and r sponsible units of railway transport i Extre e environment depends on the efficiency materi ls such as locomotive and rail steels at low temperature. Understanding of materials d structures behavior under the impact loading it is necessary t improve the c racteristics and reliability of all railway tra sport. So the stu y of locomotive steel fracture mechanism at low temperature has bee carried out. T opti al and electron mi roscopy used to study the fractur surface of impact toug ness test samples. The analysis reveals the sources of the radial fr ctur patt rn. In case of locomotive wheel bandage it is the globular particle located in the steel grains. It is bvious that the spheroidization of non-metal imperfection happens under the thermal influence during t e variable cyclic lo ding over t operation time. The stochastic modeling shows the high susceptibility of the crack growth vel city to structural size. So t problem of low reliability a d lifetime could be solved by improving the impact toug ness ant low temperature through the thermal and mechanical processing of steel and microalloying with refractory and rare-earth element compositions. Abstract

© 2019 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the ILEE-2019 organizers © 2019 The Author(s). Published by Elsevier B.V. Peer-review under responsibility of the ILEE-2019 organizers © 2019 The Author(s). Published by Elsevier B.V. Peer-review under responsibility of the ILEE-2019 organizers

Keywords: cold resistance; low temperature; transport system; extreme environment; microstructure analysis; lifetime estimation; ductile-brittle transition Keywords: cold resistance; low temperature; transport system; extreme environment; microstructure analysis; lifetime estimation; ductile-brittle transition

2452-3216 © 2019 The Author(s). Published by Elsevier B.V. Peer-review under responsibility of the ILEE-2019 organizers 2452 3216 © 2019 Th Author(s). Publis d by lsevier B.V. Peer-review under responsibility of the ILEE-2019 organizers * Correspon ing auth r. Tel.: +7-411-239-0578; fax: +7-411-233-6665. E-mail address: lepov@iptpn.ysn.ru * Corresponding author. Tel.: +7-411-239-0578; fax: +7-411-233-6665. E-mail address: lepov@iptpn.ysn.ru

2452-3216 © 2019 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the ILEE-2019 organizers 10.1016/j.prostr.2019.12.116