Effect of hydrogen on titanium and titanium plates microstructure and properties

Hydrogen reducing titanium a + β / β transformation point is a gap β stabilizing element . Effect of hydrogen on titanium and titanium alloy performance mainly as hydrogen embrittlement .

Titanium and titanium alloys ,titanium sheet hydrogen can be dissolved in the β phase and a phase , you can also γ -phase (hydride ) form. In short , the different types of embrittlement different situation .

When titanium and titanium in hydrogen content of less than 0.020% , prevent the occurrence of hydride -based hydrogen embrittlement . But the stress-induced reversible hydride hydrogen embrittlement and hydrogen embrittlement in titanium and titanium alloys are difficult to avoid.

To reduce the hydrogen embrittlement of titanium and titanium alloys , the main measures is to reduce the hydrogen content . Practice has proved that the strict control of raw materials : vacuum melting , neutral or oxidizing atmosphere or a coating used in the processing ; heat treatment in a reducing atmosphere to avoid ; welding in an inert atmosphere or vacuum protection , to avoid increasing the alkali hydrogen acid etc. are valid. In addition , aluminum, tin can increase the solubility of hydrogen in a titanium in ; β stabilizing element by increasing the number of β phase to improve the solubility of hydrogen in titanium and titanium alloys , titanium and titanium alloys to reduce both hydride and stress-induced hydride -type hydrogen embrittlement sensitivity. But titanium oxygen is to promote hydrogen embrittlement .

The reaction is reversible titanium and hydrogen , and at 0.0004 mm Hg vacuum annealed at 600 ~ 900 ℃ 2 to 4 hours titanium wire, the hydrogen can reduce the content of titanium and titanium alloy to 0.01 % or less.