PSI - Issue 30

Available online at www.sciencedirect.com Available online at www.sciencedirect.com ScienceDirect Structural Integrity Procedia 00 (2020) 000–000

www.elsevier.com/locate/procedia

ScienceDirect

Procedia Structural Integrity 30 (2020) 17–22

© 2020 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 EURASTRENCOLD - 2020 guest editors A low-carbon steel was processed by equal channel angular pressing (ECAP) in order to produce a submicrocrystalline (SMC) structure in it. The process was carried out at 400 °C through the route A up to two passes. As a result, of a severe plastic deformation during ECAP, the ferrite grains were reduced from 10 μ m to 0.2~0.3 μ m, pearlite colonies were crashed and dispersed. The results the yield and tensile strength increased significantly. To reduce the negative influence of a strain hardening after the process of ECAP, quenching and short term annealing of the steel was carried out. The impact toughness increased after ECAP and quenching, impact tests conducted at +20°C and –20°C showed a 1.3-fold increase in impact toughness. The fracture surfaces were investigated in detail after impact tests. The mechanisms of fracture in various structural states are shown. © 2020 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 EURASTRENCOLD - 2020 guest editors Keywords: submicrocrystalline structure; severe plastic deformation; equal channel angular pressing; low-alloy steel. 1. Introduction Recently, technologies for obtaining nanostructured metal materials with a submicrocrystalline (SMC) structure have been intensively developed. To obtain such materials, technologies of severe plastic deformation (SPD) are widely used, for instance equal channel angular pressing (ECAP). Materials obtained by the SPD methods have enhanced properties, such as tensile strength, hardness, wear resistance, impact toughness etc. as shown by Valiev et V IX Eurasian Symposium on the problems of strength and resource in low climatic temperatures (EURASTRENCOLD-2020) Strength increase of a low-carbon steel by equal channel angular pressing Borisova M. Z.* Larionov Institute of Physical-Technical Problems of the North SB RAS, Oktyabrskaya St. 1, Yakutsk, 677980, Russia Abstract

* Corresponding author. Tel.: +7-914-2712-305; fax: +7-4112-33-66-65 E-mail address: bormaria@yandex.ru

2452-3216 © 2020 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 the responsibility of the EURASTRENCOLD - 2020 guest editors

2452-3216 © 2020 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 EURASTRENCOLD - 2020 guest editors 10.1016/j.prostr.2020.12.004