PSI - Issue 41

ScienceDirect Structural Integrity Procedia 00 (2022) 000–000 Structural Integrity Procedia 00 (2022) 000–000 Available online at www.sciencedirect.com Available online at www.sciencedirect.com ScienceDirect Available online at www.sciencedirect.com ScienceDirect

www.elsevier.com/locate/procedia

www.elsevier.com/locate/procedia

Procedia Structural Integrity 41 (2022) 527–534

© 2022 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 MedFract2Guest Editors. The study of peculiarities of formation of the structure of cast glass-ceramic spinel-pyroxene materials under non-equilibrium conditions has established that: (1) the morphological parameters of structural components, in particular, spinels, under non equilibrium crystallization are influenced not only by the cooling rate, but also by the conditions of solidification (contact with air, with mold, no contact); the milder is the mode of crystallization, that is the lower is the cooling rate, the higher is the density of spinel distribution and the size of the largest components; (2) when crystallizing the casts in the mold, five typical zones are distinguished: a zone of the direct air contact; a transition zone between air cooling and cast center; a zone without contact with external environment; a transition zone between the cast center and the zone of contact with the mold's wall; a zone of direct contact with the mold; (3) the length of some of the zones depends on the mode of crystallization: the less equilibrium it has, the shorter is the no-contact zone and the longer are the zones of contact with air and mold; (4) there is a mechanism that causes microzoning of the structure: during crystallization, a specific critical size of spinel is achieved when the spinel acquires its own “zone of Abstract Morphometrical parameters of the structural components of the glass-ceramic materials obtained from the melts are critical for the desired properties; these parameters largely depend upon the crystallization sequence. The objective of the present work is to study the features of cryst llization of the glass-ceramic spinel-pyroxene mat rials from the melt u der n n-equilibrium conditions. T research uses a melt of the following compositio , weight %: SiO 2 – 45; MgO – 15.5; CaO – 12.5; Al 2 O 3 – 15.5; FeO – 6.5; Fe 2 O 3 – 3.5; TiO 2 – 1; Na 2 O+K 2 O – 3; CaF 2 – 1.5; Cr 2 O 3 – 1.5, and th t i l obtained through its crystallization and solidification. Two types of sa ples were btained; both were subjected to solidification in sand-clay molds but at different process param ters of crystallization, the cooling rate of the molds ight after c sting being 100 and 200 °С/h, respectively. he study peculiariti s of formation of the structur of cast glass-ceramic spinel-pyr xene m terials u de non-equilibrium conditions has established that: (1) t orphological parameters of structural components, in particular, spinels, under non equilibrium crystallization are influenced not only by th cooling rate, but lso by th conditio s of solidification (c tact with air, with m ld, no contact); the milder is the de f crystalliz tion, that is the lower is the cooling rate, the higher is the density of spinel distribution and the size of the largest compon nts; (2) wh n crystallizing the casts in the mold, five typical zones re distinguished: a zone of t e direct air contact; a transition one between air cooling and ast center; a zone without contact with external environment; a tran ition zon between the cast center and the zone of co tact with the mold's wall; a zone of direct cont ct with the mold; (3) th length of some of the zones depends on the mod of crystallization: the less quilibrium it as, the shorter is the no-co tact zon and the longer are th zones of ontact with air and mold; (4) there is a m chanism that caus s mic ozoni g of the structure: during crystallization, a sp cific critical size of spinel is achieved when the pinel acquires its own “z n of Abstract Morphometrical parameters of the structural components of the glass-ceramic materials obtained from the melts are critical for the desired properties; these parameters largely depend upon the crystallization sequence. The objective of the present work is to study the features of crystallization of the glass-ceramic spinel-pyroxene materials from the melt under non-equilibrium conditions. The research uses a melt of the following composition, weight %: SiO 2 – 45; MgO – 15.5; CaO – 12.5; Al 2 O 3 – 15.5; FeO – 6.5; Fe 2 O 3 – 3.5; TiO 2 – 1; Na 2 O+K 2 O – 3; CaF 2 – 1.5; Cr 2 O 3 – 1.5, and the material obtained through its crystallization and solidification. Two types of samples were obtained; both were subjected to solidification in sand-clay molds but at different process parameters of crystallization, the cooling rate of the molds right after casting being 100 and 200 °С/h, respectively. 2nd Mediterranean Conference on Fracture and Structural Integrity Features of crystallization of cast glass-ceramic spinel-pyroxene 2nd Mediterranean Conference on Fracture and Structural Integrity Features of crystallization of cast glass-ceramic spinel-pyroxene materi ls under non-equilibrium conditions Ignatova A.M. a , Vereschagin V.I. b , Naimark O.B. a * materials under non-equilibrium conditions Ignatova A.M. a , Vereschagin V.I. b , Naimark O.B. a * a Institute of Continuous Media Mechanics of the Ural Branch of the Russian Academy of Sciences, 1 Akademika Koroleva Street, Perm 614013, Russia b Tomsk Polytechnic University, 13 в Usova Street, Tomsk 634034, Russia a Institute of Continuous edia Mechanics of the Ural Branch of the Russian Academy of Sciences, 1 Akademika Koroleva Street, Perm 614013, Russia b Tomsk Polytechnic University, 13 в Usova Street, Tomsk 634034, Russia

* Corresponding author: . E-mail address: naimark@icmm.ru * Corresponding author: . E-mail address: naimark@icmm.ru

2452-3216 © 2022 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 MedFract2Guest Editors. 10.1016/j.prostr.2022.05.060 2452-3216 © 2022 Ignatova A.M., Vereschagin V.I., Naimark O.B. 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 MedFract2Guest Editors. 2452-3216 © 2022 Ignatova A.M., Vereschagin V.I., Naimark O.B. 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 MedFract2Guest Editors.