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 language | English |
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Pages (from-to) | 429-433 |
Number of pages | 5 |
Journal | Journal of Surface Investigation |
Volume | 13 |
Issue number | 3 |
DOIs | |
Publication status | Published - 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