Abstract
The impact of different environments on the growth of short through cracks (0.25mm<a<3mm) in thin section DEN test pieces (t=2mm) is evaluated for the titanium alloy IMI318 (Ti–6Al–4V) at atmosphere. Both oxidising and reducing atmospheres have been considered in the form of air, chlorine and hydrogen gas at various levels of partial pressure. Data are presented for crack growth under cyclic and dwell waveforms and for R values of 0.01 and 0.625. It is demonstrated that the measured rates are extremely sensitive to the gaseous species. This sensitivity is reflected in fracture surface features and quasi-cleavage facetting in particular. The implications for engineering component life predictions are discussed.
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