Effect of the Beam Current during the Electron-Beam Melting of Titanium Alloy Ti–6Al–4V on the Structural Features and Phase Transitions in Gas-Phase Hydrogenation

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Abstract

Abstract: The structure of the titanium alloy Ti–6Al–4V manufactured by electron-beam melting is shown to be represented by initial β-phase grains more than 40 μm in size; the internal volume of the grains is filled with α-phase precipitates in the form of plates. The average size of the α plates is 1.6, 2, and 5 μm at beam currents of 2, 2.5, and 3 mA, respectively. In situ X-ray diffractometry using synchrotron radiation shows that the phase transitions in the titanium alloy are divided into three main stages during hydrogenation to a concentration of 0.6 wt % at a temperature of 650°C and a pressure of 1 atm. An increase in the beam current from 2 to 3 mA does not significantly affect the phase composition of the alloy. During hydrogenation, the growth rate of the volume concentration of the β phase is lower at a higher beam current. This indicates a decrease in the rate of hydrogen absorption with increasing beam current, which is associated with an increase in the size of α plates.

Original languageEnglish
Pages (from-to)429-433
Number of pages5
JournalJournal of Surface Investigation
Volume13
Issue number3
DOIs
Publication statusPublished - 1 May 2019

Keywords

  • current beam
  • electron-beam melting
  • hydrogenation
  • phase transitions
  • structure
  • synchrotron radiation
  • titanium alloy Ti–6Al–4V

ASJC Scopus subject areas

  • Surfaces, Coatings and Films

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