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made using the potential drop method. All fatigue tests were performed on a servohydraulic MTS 250 KN machine.

9.6.2.4 Material Corrosion Characterization Procedure

The characterization of corroded specimens was conducted by stereoscopic and metallographic analysis. Stereoscopic analysis was conducted with a stereomi-croscope at 60 x. The analysis included observation of the corroded surfaces and determination of pit density (pits/m2).

The preparation of specimens for metallographic analysis consisted of cutting, mounting, grinding, and polishing. Mounting was performed in a vacuum impregnation device in order to preserve the shape of pits and keep the corroded material in place during subsequent preparation. The specimens were chemically etched using Keller's reagent. Measurements of the maximum depth of attack were conducted as well.

9.6.2.5 Determination of Trapped Hydrogen

For the hydrogen measurements, strips 2.5 mm wide and 40 mm long were cut at right angles to the rolling direction and were then exposed to exfoliation

TABLE 9.36 Tensile Tests Performed on Alloy 8090-T81
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