Failure of a High-Speed Steel Twistdrill
The failure of a high speed steel twist drill which caused injury to the user was investigated thoroughly to settle a legal suit. The drill was being used to remove a stud that broke in the vertical wall of a metalworking machine (upsetter) after drilling a pilot hole. The drill had shattered suddenly with a bang which caused a chip to be dislodged and cause the injury. A large nonmetallic inclusion parallel to the axis near the center of the drill was revealed in an unetched longitudinal section. Carbide bands in a martensitic matrix were indicated in an etched...
Failure of a High-Speed Steel Twistdrill, ASM Failure Analysis Case Histories: Machine Tools and Manufacturing Equipment, ASM International, 2019, https://doi.org/10.31399/asm.fach.machtools.c0089429
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