PSI - Issue 30

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

www.elsevier.com/locate/procedia www.elsevier.com/locate/procedia

Procedia Structural Integrity 30 (2020) 167–172

© 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 Abstract The residual stresses in the weld metal and heat affected zone welded by experimental flux-cored wires (FCW) modified by rare earth elements from the Tomtor deposit (Yakutia, Russia) were studied using X-ray diffraction methods. Alloy powders with 10 different concentrations of rare earth elements (REE) were designed and mixed with the filler material of UONI 13/55 covered electrode. The results showed that tensile internal residual stresses occurred in the weld metal and in the heat-affected zone with rare-earth metals. At the same time, compressive internal residual stresses were found in the weld metal and in the welded joint welded by flux-cored wire with 0.7 wt. % total content of REE, which prevent the formation and propagation of post-weld cracks. Microscopy indicated the formation of fine grain weld metal structure with increased hardness. There is a tendency to decrease the width of the heat-affected zone in all samples with REE compared to the heat affected zone (HAZ) width of the samples deposited by covered electrode. An optimal composition of flux-cored wires with a modifying additive with rare-earth metals is proposed. © 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: rare-earth elements; flux-cored wires; manual arc welding; microstructure; residual stresses; hardness. 1. Introduction The process of the arc welding is accompanied by high local heating of small areas of the parts to be joined and their relatively rapid cooling. This temperature gradient promotes the formation of internal stresses that arise due to IX Eurasian Symposium on the problems of strength and resource in low climatic temperatures (EURASTRENCOLD-2020) Application of X-ray diffractometry in the study of deposited metal with rare earth elements Stepanova K.V. a, * , Petrov P.P. a , Platonov A.A. a a Larionov Institute of Physical-Technical Problems of the North SB RAS, Yakutsk, 677980, 1Oktyabrskaya St., Russian Federation Abstract The residual stresses in the weld metal and heat affected zone welded by experimental flux-cored wires (FCW) modified by rare earth elements from the Tomtor deposit (Yakuti , Russia) w re studied using X-ray diffracti n methods. Alloy p wd rs with 10 differ nt co centrations of rare earth elements (REE) were designed and mixed with the filler aterial of UONI 13/55 covered electrode. The results sh wed that tensile internal residual str ses occurred in the weld metal and in the heat-affected zone with rare-earth metals. At the same time, compressive internal residual stresses were found in the weld metal and in the welded joint weld d by flux-cored wire with 0.7 wt. % total content of REE, which prevent the formation and propagation of post-weld cracks. Microscopy indicated t e formation of fine grain weld metal structure with increased hardness. There is a tendency to decrease the width of the heat-affected z e in all samples with REE compared to the heat affected zone (HAZ) width of the samples deposited by cover d electro e. An optimal composition of flux-cored wires with a modifying additive with rare-earth metals is propose . © 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 t EURASTRENCOLD - 2020 guest editors Keywords: rare-earth elements; flux-cored wires; manual arc welding; microstructure; residual stresses; hardness. 1. Introduction The process of the arc welding is accompanied by high local heating of small areas of the parts to be joined and their relativ ly rapid cooling. This temperature gradient promotes the formation of internal stresse that arise ue to IX Eurasian Symposium on the problems of strength and resource in low climatic temperatures (EURASTRENCOLD-2020) Application of X-ray diffractometry in the study of deposited metal with rare earth elements Stepanova K.V. a, * , Petrov P.P. a , Platonov A.A. a a Larionov Institute of Physical-Technical Problems of the North SB RAS, Yakutsk, 677980, 1Oktyabrskaya St., Russian Federation

* Corresponding author. Tel.: +7-4112-39-0600. E-mail: kseniastepanova@rambler.ru * Corresponding author. Tel.: +7-4112-39-0600. E-mail: kseniastepanova@rambler.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 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.2020.12.026