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Threads of a bone screw (Co-Cr-Mo alloy, type ASTM F75) had broken off, and other threads had cracked. 15x sectioning showed porosity, and 155x magnification showed gas holes, segregation, and dissolved oxides. This supports the conclusion that manufacturing defects caused the failure.

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2019. "Retrieved Bone Screw Made From Co-Cr-Mo Alloy with Casting Defects", ASM Failure Analysis Case Histories: Medical and Biomedical Devices

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