Effect of hydrogen on corrosion resistance and fatigue properties of near-β Ti-5Al-5Mo-5V-3Cr-1Zr alloy
Zhong Yang, Mei Yu, Chao Han, Zhenjiang Zhao, Xuejiao Jia, Songmei Li, Jianhua Liu
Abstract
Clarifying the performance changes and mechanisms under the action of hydrogen is crucial for the safe application of near-β Ti-5Al-5Mo-5V-3Cr-1Zr (Ti-55531) alloy. Effects of hydrogen on the microstructure, corrosion resistance and fatigue properties of near-β Ti-55531 alloy were investigated by controlling electrochemical hydrogen charging time. As the hydrogen content increased by 26.36-fold to 478.20 ppm, the fatigue life decreased by 61.87 % to 6672 cycles, and the passive current density increased by 2.93-fold to 1.06 × 10 −5 A cm −2 due to the passive film degradation and matrix alterations. Surface microstructure detachment accelerated crack initiation, and plastic damage further contributed to fatigue performance degradation .