Effects of Water Cooling on the Microstructure of Electron Beam Additive-Manufactured Ti-6Al-4V

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 refi...

Descripción completa

Guardado en:

Detalles Bibliográficos
Autores principales:	Alexey Panin, Sergey Martynov, Marina Kazachenok, Lyudmila Kazantseva, Alexander Bakulin, Svetlana Kulkova, Olga Perevalova, Elena Sklyarova
Formato:	article
Lenguaje:	EN
Publicado:	MDPI AG 2021
Materias:	wire-fed electron beam additive manufacturing Ti-6Al-4V water-cooled substrate microstructure martensite decomposition residual stress Mining engineering. Metallurgy TN1-997
Acceso en línea:	https://doaj.org/article/c68a1958fc444f4e98bfe3ca24613f1f
Etiquetas:	Agregar Etiqueta Sin Etiquetas, Sea el primero en etiquetar este registro!

id	oai:doaj.org-article:c68a1958fc444f4e98bfe3ca24613f1f
record_format	dspace
spelling	oai:doaj.org-article:c68a1958fc444f4e98bfe3ca24613f1f2021-11-25T18:21:36ZEffects of Water Cooling on the Microstructure of Electron Beam Additive-Manufactured Ti-6Al-4V10.3390/met111117422075-4701https://doaj.org/article/c68a1958fc444f4e98bfe3ca24613f1f2021-10-01T00:00:00Zhttps://www.mdpi.com/2075-4701/11/11/1742https://doaj.org/toc/2075-4701The 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 β grains with lateral sizes ranging up to 2000 µm, while cooling of the build platform causes the appearance of equiaxed prior β grains measuring 1000 µm. Moreover, the refinement of the martensite structure and the precipitation of α′′ martensite platelets within α laths occur in the EBAM Ti-6Al-4V samples built on the water-cooled build platform. An explanation of the mechanisms underlying the α′→α + β and α′→α + α′′ + β 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.Alexey PaninSergey MartynovMarina KazachenokLyudmila KazantsevaAlexander BakulinSvetlana KulkovaOlga PerevalovaElena SklyarovaMDPI AGarticlewire-fed electron beam additive manufacturingTi-6Al-4Vwater-cooled substratemicrostructuremartensite decompositionresidual stressMining engineering. MetallurgyTN1-997ENMetals, Vol 11, Iss 1742, p 1742 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	wire-fed electron beam additive manufacturing Ti-6Al-4V water-cooled substrate microstructure martensite decomposition residual stress Mining engineering. Metallurgy TN1-997
spellingShingle	wire-fed electron beam additive manufacturing Ti-6Al-4V water-cooled substrate microstructure martensite decomposition residual stress Mining engineering. Metallurgy TN1-997 Alexey Panin Sergey Martynov Marina Kazachenok Lyudmila Kazantseva Alexander Bakulin Svetlana Kulkova Olga Perevalova Elena Sklyarova Effects of Water Cooling on the Microstructure of Electron Beam Additive-Manufactured Ti-6Al-4V
description	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 β grains with lateral sizes ranging up to 2000 µm, while cooling of the build platform causes the appearance of equiaxed prior β grains measuring 1000 µm. Moreover, the refinement of the martensite structure and the precipitation of α′′ martensite platelets within α laths occur in the EBAM Ti-6Al-4V samples built on the water-cooled build platform. An explanation of the mechanisms underlying the α′→α + β and α′→α + α′′ + β 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.
format	article
author	Alexey Panin Sergey Martynov Marina Kazachenok Lyudmila Kazantseva Alexander Bakulin Svetlana Kulkova Olga Perevalova Elena Sklyarova
author_facet	Alexey Panin Sergey Martynov Marina Kazachenok Lyudmila Kazantseva Alexander Bakulin Svetlana Kulkova Olga Perevalova Elena Sklyarova
author_sort	Alexey Panin
title	Effects of Water Cooling on the Microstructure of Electron Beam Additive-Manufactured Ti-6Al-4V
title_short	Effects of Water Cooling on the Microstructure of Electron Beam Additive-Manufactured Ti-6Al-4V
title_full	Effects of Water Cooling on the Microstructure of Electron Beam Additive-Manufactured Ti-6Al-4V
title_fullStr	Effects of Water Cooling on the Microstructure of Electron Beam Additive-Manufactured Ti-6Al-4V
title_full_unstemmed	Effects of Water Cooling on the Microstructure of Electron Beam Additive-Manufactured Ti-6Al-4V
title_sort	effects of water cooling on the microstructure of electron beam additive-manufactured ti-6al-4v
publisher	MDPI AG
publishDate	2021
url	https://doaj.org/article/c68a1958fc444f4e98bfe3ca24613f1f
work_keys_str_mv	AT alexeypanin effectsofwatercoolingonthemicrostructureofelectronbeamadditivemanufacturedti6al4v AT sergeymartynov effectsofwatercoolingonthemicrostructureofelectronbeamadditivemanufacturedti6al4v AT marinakazachenok effectsofwatercoolingonthemicrostructureofelectronbeamadditivemanufacturedti6al4v AT lyudmilakazantseva effectsofwatercoolingonthemicrostructureofelectronbeamadditivemanufacturedti6al4v AT alexanderbakulin effectsofwatercoolingonthemicrostructureofelectronbeamadditivemanufacturedti6al4v AT svetlanakulkova effectsofwatercoolingonthemicrostructureofelectronbeamadditivemanufacturedti6al4v AT olgaperevalova effectsofwatercoolingonthemicrostructureofelectronbeamadditivemanufacturedti6al4v AT elenasklyarova effectsofwatercoolingonthemicrostructureofelectronbeamadditivemanufacturedti6al4v
_version_	1718411284212350976

Effects of Water Cooling on the Microstructure of Electron Beam Additive-Manufactured Ti-6Al-4V

Ejemplares similares