Brittle Fracture of a Cadmium-Plated 4140 Steel Retaining Ring at a Hard Spot Caused by an Arc Strike
After less than 30 days in service, several cadmium-plated retaining rings, made of 4140 steel tubing and heat treated to 36 to 40 HRC, broke during operation that included holding components of a segmented fitting in place under a constant load. Photographic and 100x nital-etched micrographic examination showed a microstructure of tempered martensite with low inclusion content as well as a pit or burned spot on the outer area of the ring. The defect was approximately 0.18 mm (0.007 in.) deep and 0.5 mm (0.020 in.) in diam and had a hardness of 58 to 60 HRC. The base...
Brittle Fracture of a Cadmium-Plated 4140 Steel Retaining Ring at a Hard Spot Caused by an Arc Strike, ASM Failure Analysis Case Histories: Mechanical and Machine Components, ASM International, 2019, https://doi.org/10.31399/asm.fach.mech.c0046057
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