ASM Failure Analysis Case Histories: Mechanical and Machine Components
Brittle Failure of Locking Collar Produced From Rolled 4140 Grade Steel Plate
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Published:2019
Abstract
The locking collar on a machine failed suddenly when the shaft it restrained was inadvertently subjected to an axial load slightly higher than the allowable working load. The locking collar fractured abruptly, producing four large fragments. This allowed the shaft to be propelled forcefully in the direction of the load, causing substantial damage to other machinery components in the vicinity. The failed component, which was 43 cm (17 in.) in diameter, was machined from 4140 plate and heat treated to 34 to 36 HRC. Analysis (visual inspection, composite micrographs, scanning electron microscopy, and mechanical-property analysis) supported the conclusions that...
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Member Sign InBrittle Failure of Locking Collar Produced From Rolled 4140 Grade Steel Plate, ASM Failure Analysis Case Histories: Mechanical and Machine Components, ASM International, 2019, https://doi.org/10.31399/asm.fach.mech.c0047105
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