The behavior of hydrogen in high temperature titanium alloy Ti-60

Effect of hydrogen content on superplastic forming/diffusion bonding of TC21 alloys

“…Secondly, the temperature of ␣ to ␤ phase transformation is decreased and phase transformation proceeds at relatively low temperature. Thirdly, the addition of hydrogen increases the ductility and reduces the flow stress of ␣ + ␤ titanium alloy [11][12][13][14][15][16], which can decrease the temperature of superplastic deformation. Finally, hydrogen affects the diffusivity of alloying elements as well as the dislocation slip systems [17].…”

Effect of 0.770wt%H addition on the microstructure of Ti–6Al–4V alloy and mechanism of δ hydride formation

“…Hydrogen is a very active chemical element and can react with titanium strongly [1]. In recent years, effects of hydrogen on microstructure, phase transformation, hardness, hydride formation and mechanical properties in titanium and titanium alloys were widely investigated [2][3][4][5][6][7][8][9][10][11][12][13][14][15][16]. It has been demonstrated [7][8][9][10][11][12] that the addition of a certain amount of hydrogen increases the ductility, reduces the flow stress and decreases the ␤ transformation temperature of titanium alloys.…”

Effect of 0.16wt% hydrogen addition on high temperature deformation behavior of the Ti600 titanium alloy

“…An increased understanding of titanium metallurgy has demonstrated that hydrogen as a temporary alloying element can be used to improve the hot workability and microstructure/mechanical properties of titanium alloys, that is called the thermal hydrogenation processing (THP) [1][2][3][4][5]. A lot of investigations have been performed to improve the hot workability of titanium alloys through thermal hydrogenation processing [2,[6][7][8][9][10][11][12][13]. It has generally found [2,[6][7][8][9][10][11][12][13] that the addition of hydrogen increases the ductility and reduces the flow stress of ␣-type and ␣ + ␤-type titanium alloys in ␣ singlephase and ␣ + ␤ two-phase regions.…”

“…A lot of investigations have been performed to improve the hot workability of titanium alloys through thermal hydrogenation processing [2,[6][7][8][9][10][11][12][13]. It has generally found [2,[6][7][8][9][10][11][12][13] that the addition of hydrogen increases the ductility and reduces the flow stress of ␣-type and ␣ + ␤-type titanium alloys in ␣ singlephase and ␣ + ␤ two-phase regions. The effect of hydrogen on the strengthening of titanium alloys in ␤ single-phase region was also reported [10][11][12].…”