Effects of Water Cooling on the Microstructure of Electron Beam Additive-Manufactured Ti-6Al-4V; Metals; Vol. 11, iss. 11

Effects of Water Cooling on the Microstructure of Electron Beam Additive-Manufactured Ti-6Al-4V; Metals; Vol. 11, iss. 11

Dades bibliogràfiques
Parent link:Metals
Vol. 11, iss. 11.— 2021.— [1742, 15 p.]
Autor corporatiu: Национальный исследовательский Томский политехнический университет Инженерная школа ядерных технологий Отделение экспериментальной физики
Altres autors: Panin A. V. Alexey Viktorovich, Martynov S. A. Sergey Aleksandrovich, Kazachenok M. S. Marina Sergeevna, Kazantseva L. M. Lyudmila Mikhaylovna, Bakulin A. V. Aleksandr Viktorovich, Kulkova S. Svetlana, Perevalova O. B. Olga Borisovna, Sklyarova E. A. Elena Aleksandrovna
Sumari:Title screen
The inferior mechanical properties of EBAM Ti-6Al-4V samples are due to the coarse columnar grains containing coarse lamellar structures. One can expect that water cooling of the build platform will increase the cooling rate of the molten pool during the build-up process, causing microstructure refinement. In the present work, the substrate cooling effects on the microstructure and phase composition of EBAM Ti-6Al-4V samples are studied using optical, scanning electron, and scanning transmission microscopy, as well as X-ray diffraction analysis. It is shown that the microstructure of the EBAM Ti-6Al-4V samples built on the substrate without water cooling consists predominantly of columnar prior beta grains with lateral sizes ranging up to 2000 [mu]m, while cooling of the build platform causes the appearance of equiaxed prior beta grains measuring 1000 [mu]m. Moreover, the refinement of the martensite structure and the precipitation of alpha′′ martensite platelets within alpha laths occur in the EBAM Ti-6Al-4V samples built on the water-cooled build platform. An explanation of the mechanisms underlying the alpha′→alpha+beta and alpha′→alpha+alpha′′+beta transformations during the building process is provided based upon ab initio calculations. The fragmentation of the α laths under the residual compressive stresses is discussed.
Idioma:anglès
Publicat: 2021
Matèries:
электронный ресурс
труды учёных ТПУ
wire-fed electron beam additive manufacturing
Ti-6Al-4V
water-cooled substrate
microstructure
martensite decomposition
residual stress
аддитивное производство
субстраты
микроструктуры
разложение
мартенсит
водяное охлаждение
Accés en línia:http://earchive.tpu.ru/handle/11683/71107
https://doi.org/10.3390/met11111742
Format: Electrònic Capítol de llibre
KOHA link:https://koha.lib.tpu.ru/cgi-bin/koha/opac-detail.pl?biblionumber=666344

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