氢含量对锆合金蠕变-疲劳行为的影响及机理研究.

This study investigates the creep-fatigue behavior of recrystallized zirconium alloy at 320 °C and different hydrogen contents using frequency-corrected strain life and frequency-corrected hysteresis energy methods. The results indicate that as the holding time increases, the creep-fatigue resistance of the non-hydrogen permeation sample decreases, but there is no significant effect when holding time exceeds 30 s. However, the effect of holding time on the creep-fatigue resistance of hydrogen permeation sample is not significant. It was found that the non-hydrogen permeation sample had the best creep-fatigue resistance, while the 0.04% hydrogen permeation sample had the worst resistance. The creep-fatigue resistance of the 0.005% hydrogen permeation sample was weaker at high strain levels (high hysteresis energy) than that of the 0.02% hydrogen permeation sample, and better than that of the 0.02% hydrogen permeation sample at low strain levels. The effect mechanism of hydrogen content on creep-fatigue behavior: solid solution hydrogen can increase creep-fatigue life, while hydrides can reduce creep-fatigue life. The hydride plays a dominant role in the sample with hydrogen content of 0.04%, resulting in the worst creep-fatigue performance. [ABSTRACT FROM AUTHOR]