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) 305–309

© 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. the form of fragments up to 5 μm in size and equally oriented non -axial crystallites, formi g groups in the for of arcuate lay s with a front width of 800 μm and depth from 10 to 30 m icrons. Between them, narrow zones of increased chemical content were ound, w ich are int rpreted as robable traces of the stoppages of th rmal fronts. We record traces of mass localized microplastic flow in the form of extend (up to 350x40 µm) and c urved micr regions with unequal-sized grains ordering mi roregions filled with equia ial recrystallized grains due to the ction of non-uniform thermal fields. Thus, in etal objects produced by t e SLM, the complex morph logy of the structure indicates a combination of different-scal mechanisms of structural chang s. It has been established that in non-stationary temperature conditions of structure formation, the role of kinetic processes increases. © 201 9 The Authors. Published by Elsevier B.V. This is an ope acces article under the CC BY-NC-ND license (http://creativecommon org/licenses/by-nc-nd/4.0/) Peer-review under responsibility of the scientific committee of the IC MSMF organizers. A powder of different fractional composition was obtained from the iron ingot using the melt atomization method, from which samples for further studies were grown on the EOSint M270 unit using the selective laser melting (SLM) method. When considering the thin sections of the samples, we observed equiaxed recrys tallized grains up to 20 μm in size, randomly distributed particles in the form of fragments up to 5 μm in size and equally oriented non -axial crystallites, forming groups in the form of arcuate layers with a front width of 800 μm and depth from 10 to 30 m icrons. Between them, narrow zones of increased chemical content were found, which are interpreted as probable traces of the stoppages of thermal fronts. We recorded traces of mass localized microplastic flow in the form of extended (up to 350x40 µm) and c urved microregions with unequal-sized grains bordering microregions filled with equiaxial recrystallized grains due to the action of non-uniform thermal fields. Thus, in metal objects produced by the SLM, the complex morphology of the structure indicates a combination of different-scale mechanisms of structural changes. It has been established that in non-stationary temperature conditions of structure formation, the role of kinetic processes increases. A powder o different fractional comp sition was obtained from the iron ingot using th melt atomization method, fr m wh ch samples for further studies were grown on the EOSint M270 unit using the selective laser melting (SLM) ethod. Wh n cons d ring thin sections of the samples, we obs rve iaxed r crys tallized grains up to 20 μm i size, randomly distributed p rticles in 9th International Conference on Materials Structure and Micromechanics of Fracture The Structure of Iron Powder Aggregation Obtained by Selective Laser Melting Anton Zhukov a, *, Boris Barakhtin a , Ivan Shakirov a , Vitaliy Bobyr a , Pavel Kuznetsov a a NRC "Kurchatov Institute" – CRISM "Prometey", 49 Shpalernaya str., St. Petersburg, 191015, Russia 9th International Conference on Materials Structure and Micromechanics of Fracture The Structure of Iron Powder Aggregation Obtained by Selective Laser Melting Anton Zhukov a, *, Boris Barakhtin a , Ivan Shakirov a , Vitaliy Bobyr a , Pavel Kuznetsov a a NRC "Kurchatov Institute" – CRISM "Prometey", 49 Shpalernaya str., St. Petersburg, 191015, Russia Abstract Abstract

Keywords: additive technologies; selective laser melting; powdered iron; kinetic processes Keywords: additive technologies; selective laser melting; powdered iron; kinetic processes

* Corresponding author. Tel.: +7-921-306-2086; fax: +7-812-783-4249. E-mail address: npk3@crism.ru * Correspon ing author. Tel.: +7-921-306-2086; fax: +7-812-783-4249. E-mail address: npk3@crism.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.2020.01.104