Hydrogen influence on defect structure and mechanical properties of EBM Ti-6Al-4V

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2 Citations (Scopus)

Abstract

The defect structure and mechanical properties of the samples manufactured from Ti-6Al-4V powder by electron beam melting (EBM) before and after hydrogenation was studied. It has been established that hydrogenation of EBM titanium alloy to a concentration of 470 ppm leads to the formation of titanium γ-hydride, the volume content of which is 2.2%. A further increase in the concentration of hydrogen to 650 ppm is accompanied by a slight increase in the content of the hydride phase, while the proportion of the β phase of titanium increases (to 4.9%). When the hydrogen content is 900 ppm, the fraction of γhydride decreases and the fraction of the beta phase decreases to 4.2%, and the formation of the hydride phase δis observed. The introduction of hydrogen leads to a decrease in the wear and an increase in the hardness of EBM Ti-6Al-4V samples. This circumstance is due to the microstructure refinement under the action of hydrogen and the formation of secondary phase precipitates. The hydrogen content increases, the dislocation density and the concentration of hydrogen-vacancy complexes linearly increase, which indicates that hydrogen not only actively interacts with existing defects but also induces the formation of new defects.

Original languageEnglish
Pages (from-to)2084-2088
Number of pages5
JournalMaterials Today: Proceedings
Volume19
DOIs
Publication statusPublished - 2019
Event2019 International Conference on Modern Trends in Manufacturing Technologies and Equipment, ICMTMTE 2019 - Sevastopol, Russian Federation
Duration: 9 Sep 201913 Sep 2019

Keywords

  • Defects
  • Electron beam melting
  • Hydrogen
  • Positron
  • Titanium alloy

ASJC Scopus subject areas

  • Materials Science(all)

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