Hydrogen-induced phase transformation and microstructure evolution for Ti-6Al-4V parts produced by electron beam melting

Natalia Pushilina, Alexey Panin, Maxim Syrtanov, Egor Kashkarov, Viktor Kudiiarov, Olga Perevalova, Roman Laptev, Andrey Lider, Andrey Koptyug

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Abstract

In this paper, phase transitions and microstructure evolution in titanium Ti-6Al-4V alloy parts produced by electron beam melting (EBM) under hydrogenation was investigated. Hydrogenation was carried out at the temperature of 650 °C to the absolute hydrogen concentrations in the samples of 0.29, 0.58, and 0.90 wt. %. Comparative analysis of microstructure changes in Ti-6Al-4V alloy parts was performed using scanning electron microscopy (SEM), transmission electron microscopy (TEM), and X-ray diffraction (XRD). Furthermore, in-situ XRD was used to investigate the phase transitions in the samples during hydrogenation. The structure of Ti-6Al-4V parts produced by EBM is represented by the α phase plates with the transverse length of 0.2 µm, the β phase both in the form of plates and globular grains, and metastable α'' and ω phases. Hydrogenation to the concentration of 0.29 wt. % leads to the formation of intermetallic Ti3Al phase. The dimensions of intermetallic Ti3Al plates and their volume fraction increase significantly with hydrogen concentration up to 0.58 wt. % along with precipitation of nano-sized crystals of titanium δ hydrides. Individual Ti3Al plates decay into nanocrystals with increasing hydrogen concentration up to 0.9 wt. % accompanied by the increase of proportion and size of hydride plates. Hardness of EBM Ti-6Al-4V alloy decreases with hydrogen content.

Original languageEnglish
Article number301
JournalMetals
Volume8
Issue number5
DOIs
Publication statusPublished - 1 May 2018

Fingerprint

Electron beam melting
Hydrogenation
Hydrogen
Phase transitions
Microstructure
Titanium
Hydrides
Intermetallics
X ray diffraction
Nanocrystals
Volume fraction
Hardness
Transmission electron microscopy
Crystals
Scanning electron microscopy
titanium alloy (TiAl6V4)
Temperature

Keywords

  • Additive manufacturing
  • Electron beam melting
  • Hydrogen
  • Microstructure
  • Phase transitions
  • Titanium Ti-6Al-4V alloy

ASJC Scopus subject areas

  • Materials Science(all)

Cite this

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title = "Hydrogen-induced phase transformation and microstructure evolution for Ti-6Al-4V parts produced by electron beam melting",
abstract = "In this paper, phase transitions and microstructure evolution in titanium Ti-6Al-4V alloy parts produced by electron beam melting (EBM) under hydrogenation was investigated. Hydrogenation was carried out at the temperature of 650 °C to the absolute hydrogen concentrations in the samples of 0.29, 0.58, and 0.90 wt. {\%}. Comparative analysis of microstructure changes in Ti-6Al-4V alloy parts was performed using scanning electron microscopy (SEM), transmission electron microscopy (TEM), and X-ray diffraction (XRD). Furthermore, in-situ XRD was used to investigate the phase transitions in the samples during hydrogenation. The structure of Ti-6Al-4V parts produced by EBM is represented by the α phase plates with the transverse length of 0.2 µm, the β phase both in the form of plates and globular grains, and metastable α'' and ω phases. Hydrogenation to the concentration of 0.29 wt. {\%} leads to the formation of intermetallic Ti3Al phase. The dimensions of intermetallic Ti3Al plates and their volume fraction increase significantly with hydrogen concentration up to 0.58 wt. {\%} along with precipitation of nano-sized crystals of titanium δ hydrides. Individual Ti3Al plates decay into nanocrystals with increasing hydrogen concentration up to 0.9 wt. {\%} accompanied by the increase of proportion and size of hydride plates. Hardness of EBM Ti-6Al-4V alloy decreases with hydrogen content.",
keywords = "Additive manufacturing, Electron beam melting, Hydrogen, Microstructure, Phase transitions, Titanium Ti-6Al-4V alloy",
author = "Natalia Pushilina and Alexey Panin and Maxim Syrtanov and Egor Kashkarov and Viktor Kudiiarov and Olga Perevalova and Roman Laptev and Andrey Lider and Andrey Koptyug",
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T1 - Hydrogen-induced phase transformation and microstructure evolution for Ti-6Al-4V parts produced by electron beam melting

AU - Pushilina, Natalia

AU - Panin, Alexey

AU - Syrtanov, Maxim

AU - Kashkarov, Egor

AU - Kudiiarov, Viktor

AU - Perevalova, Olga

AU - Laptev, Roman

AU - Lider, Andrey

AU - Koptyug, Andrey

PY - 2018/5/1

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N2 - In this paper, phase transitions and microstructure evolution in titanium Ti-6Al-4V alloy parts produced by electron beam melting (EBM) under hydrogenation was investigated. Hydrogenation was carried out at the temperature of 650 °C to the absolute hydrogen concentrations in the samples of 0.29, 0.58, and 0.90 wt. %. Comparative analysis of microstructure changes in Ti-6Al-4V alloy parts was performed using scanning electron microscopy (SEM), transmission electron microscopy (TEM), and X-ray diffraction (XRD). Furthermore, in-situ XRD was used to investigate the phase transitions in the samples during hydrogenation. The structure of Ti-6Al-4V parts produced by EBM is represented by the α phase plates with the transverse length of 0.2 µm, the β phase both in the form of plates and globular grains, and metastable α'' and ω phases. Hydrogenation to the concentration of 0.29 wt. % leads to the formation of intermetallic Ti3Al phase. The dimensions of intermetallic Ti3Al plates and their volume fraction increase significantly with hydrogen concentration up to 0.58 wt. % along with precipitation of nano-sized crystals of titanium δ hydrides. Individual Ti3Al plates decay into nanocrystals with increasing hydrogen concentration up to 0.9 wt. % accompanied by the increase of proportion and size of hydride plates. Hardness of EBM Ti-6Al-4V alloy decreases with hydrogen content.

AB - In this paper, phase transitions and microstructure evolution in titanium Ti-6Al-4V alloy parts produced by electron beam melting (EBM) under hydrogenation was investigated. Hydrogenation was carried out at the temperature of 650 °C to the absolute hydrogen concentrations in the samples of 0.29, 0.58, and 0.90 wt. %. Comparative analysis of microstructure changes in Ti-6Al-4V alloy parts was performed using scanning electron microscopy (SEM), transmission electron microscopy (TEM), and X-ray diffraction (XRD). Furthermore, in-situ XRD was used to investigate the phase transitions in the samples during hydrogenation. The structure of Ti-6Al-4V parts produced by EBM is represented by the α phase plates with the transverse length of 0.2 µm, the β phase both in the form of plates and globular grains, and metastable α'' and ω phases. Hydrogenation to the concentration of 0.29 wt. % leads to the formation of intermetallic Ti3Al phase. The dimensions of intermetallic Ti3Al plates and their volume fraction increase significantly with hydrogen concentration up to 0.58 wt. % along with precipitation of nano-sized crystals of titanium δ hydrides. Individual Ti3Al plates decay into nanocrystals with increasing hydrogen concentration up to 0.9 wt. % accompanied by the increase of proportion and size of hydride plates. Hardness of EBM Ti-6Al-4V alloy decreases with hydrogen content.

KW - Additive manufacturing

KW - Electron beam melting

KW - Hydrogen

KW - Microstructure

KW - Phase transitions

KW - Titanium Ti-6Al-4V alloy

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