Flaws in large 7050 aluminum ring rolled forgings
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Defects found in large-diameter 7050-T7451 aluminum alloy ring forgings were characterized with multiple destructive and nondestructive methods. The approximate length, width, and thickness of the flaws were estimated. The orientation of the flaws was found to be consistent with the grain flow within the forging, both in the primary (tangential) direction as well as in the secondary grain flow in the axial-radial plane. Several theories for the continued presence of the defects are supportable based on the data collected in the investigation. The flaws encountered appear to be the result of unhealed porosity. This porosity, resulting from the ingot casting process, is normally closed by the forging process in other forged product. The precise mechanism resisting closure has not been determined, but is speculated to be hydrogen gas.
Keywords7050 aluminum flaws forging hydrogen ultrasonic
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