The Effect of Nanoscale Mesoscopic Structural States Associated with Lattice Curvature on the Mechanical Behavior of Ti–6Al–4V Alloy; Physical Mesomechanics; Vol. 23, iss. 6

The Effect of Nanoscale Mesoscopic Structural States Associated with Lattice Curvature on the Mechanical Behavior of Ti–6Al–4V Alloy; Physical Mesomechanics; Vol. 23, iss. 6

Bibliographic Details
Parent link:Physical Mesomechanics
Vol. 23, iss. 6.— 2020.— [P. 457–465]
Corporate Author: Национальный исследовательский Томский политехнический университет Инженерная школа ядерных технологий Отделение экспериментальной физики
Other Authors: Panin V. E. Viktor Evgenyevich, Shulepov I. A. Ivan Anisimovich, Panin A. V. Alexey Viktorovich, Perevalova O. B. Olga Borisovna, Vlasov I. V. Ilya Viktorovich
Summary:Title screen
The paper studies the effect of the temperature of helical rolling, which creates nanoscale mesoscopic structural states in lattice curvature zones, on the low-temperature impact toughness of Ti-6Al-4V alloy. The polymorphic transformation temperature Tс = 950°C is shown to play the decisive role in this effect. The impact toughness is very high at helical rolling temperatures above Tс, while in the low-temperature range up to T = -70°C it decreases monotonically. This is a very important aspect of the technology. Starting from the helical rolling temperature T = 950°C, the toughness sharply decreases at T = -70°C. At T = 900°C, it decreases sharply already at T = -20°C. At T = 850°C, the level of the entire toughness curve of the alloy is low. The high level of impact toughness at T > Tс is found to be due to a two-stage transformation of the bcc β phase into a mixture of (α + β) phases. The first stage involves nonequilibrium microscopic decomposition into the α and β phases. At the second stage, the nonequilibrium β phase decomposes into (α + β) subbands in accordance with the interstitial structural states associated with lattice curvature. In helical rolling at T < Tс, the formation of martensite phases in the close-packed lattice of the α phase of titanium reduces its impact toughness. The fatigue life of Ti-6Al-4V alloy helically rolled at T = 1000°C remains unchanged.
Режим доступа: по договору с организацией-держателем ресурса
Language:English
Published: 2020
Subjects:
труды учёных ТПУ
электронный ресурс
Ti–6Al–4V alloy
low-temperature impact toughness
helical rolling
nanoscale mesoscopic structural states
martensite phases
polymorphic transformation temperature
Online Access:https://doi.org/10.1134/S1029959920060016
Format: Electronic Book Chapter
KOHA link:https://koha.lib.tpu.ru/cgi-bin/koha/opac-detail.pl?biblionumber=665040

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