Effect of the hydrogen content on the deformation behavior in the isothermal compression of Ti600 alloy

Isothermal compression of the Ti600 alloy at the hydrogen contents ranging from 0.16 wt% to 0.45 wt%, the deformation temperatures ranging from 800 °C to 1000 °C and the strain rates of 0.001 s−1, 0.01 s−1, 0.1 s−1, 1.0 s−1 and 10.0 s−1 was conducted on a Gleeble-1500D thermo-mechanical simulator. According to the experimental results of Ti600 alloy, the strain hardening exponent decreases with the increasing of hydrogen content. The hydrogen content, deformation temperature and strain rate affects significantly the temperature sensitivity exponent and the strain rate sensitivity exponent of Ti600 alloy, but the strain affects the temperature sensitivity exponent of Ti600 alloy slightly. The hydrogen content decreases the apparent activation energy for deformation in the α + β region of Ti600 alloy by 30%, but the effect of the hydrogen content in the β region of Ti600 alloy is slight.

Research highlights▶ The strain hardening exponent, the temperature sensitivity exponent, the strain rate sensitivity exponent and the apparent activation energy for deformation of Ti600 alloy has been calculated according to the experimental results at the hydrogen contents ranging from 0.16 wt% to 0.45 wt%, the deformation temperatures ranging from 800 °C to 1000 °C with an intervals of 40 °C and the strain rates of 0.001 s−1, 0.01 s−1, 0.1 s−1, 1.0 s−1 and 10.0 s−1 and a height reduction of 50%. ▶ The effect of the hydrogen content, strain rate and deformation temperature on the strain rate sensitivity exponent, the strain hardening exponent, the temperature sensitivity exponent, the strain rate sensitivity exponent and the apparent activation energy for deformation of Ti600 alloy affects significantly at the hydrogen contents ranging from 0.16 wt% to 0.65 wt%, and the effect of the strain is slight.