Abstract
The influence of high-pressure gaseous hydrogen environment (15 MPa) on the fatigue crack growth in forged Ti-6A1-4V at room temperature is investigated. It is observed that the fatigue crack growth (FCG) rate is fluctuating at 20 ≤ ΔK ≤ 26 MPa√m, and increase drastically at ΔK > 26 MPa√m in hydrogen environment. The effect of hydrogen on the FCG rate is dependent on the stress intensity level (ΔK). Detailed fractographic analysis of the fracture surfaces is performed at different ΔK using field emission scanning electron microscope (FE-SEM). The differences in appearance of fracture surfaces in air and hydrogen are discussed.
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