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Cassio Barbosa, Ibrahim de Cerqueira Abud, Tatiana Silva Barros, Sheyla Santana de Carvalho, Ieda Maria Vieira Caminha
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ASTM F138 (wrought stainless steel)
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ASTM F138 (wrought stainless steel)
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Book Chapter
Series: ASM Failure Analysis Case Histories
Volume: 3
Publisher: ASM International
Published: 01 December 2019
DOI: 10.31399/asm.fach.v03.c9001804
EISBN: 978-1-62708-241-9
... electron microscopy fatigue strength ASTM F138 (wrought stainless steel) UNS S31673 Introduction In the last decades the noticeable aging of the world population has contributed to a considerable growth in the amount of surgeries of different types, in spite of the significant contribution...
Abstract
A stainless steel screw securing an orthopedic implant fractured and was analyzed to determine the cause. Investigators used optical and scanning electron microscopy to examine the fracture surfaces and the microstructure of the austenitic stainless steel from which the screw was made. The results of the study indicated that the screw failed due to fatigue fracture stemming from surface cracks generated by stress concentration likely caused by grooves left by improper machining.
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.med.c9001579
EISBN: 978-1-62708-226-6
... standard was the ASTM F138-00 for implant materials, “Standard Specification for Wrought 18 Chromium — 14 Nickel — 2.5 Molybdenum Stainless Steel Bar and Wire for Surgical implant (UNSS31673).” In accordance with the requirements reported in the standard specification, the stainless steel used to fabricate...
Abstract
Stainless steel is frequently used for bone fracture fixation in spite of its sensitivity to pitting and cracking in chloride containing environments (such as organic fluids) and its susceptibility to fatigue and corrosion fatigue. A 316L stainless steel plate implant used for fixation of a femoral fracture failed after only 16 days of service and before bone callus formation had occurred. The steel used for the implant met the requirements of ASTM Standard F138 but did contain a silica-alumina inclusion that served as the initiation point for a fatigue/corrosion fatigue fracture. The fracture originated as a consequence of stress intensification at the edge of a screw hole located just above the bone fracture; several fatigue cracks were also observed on the opposite side of the screw hole edge. The crack propagated in a brittle-like fashion after a limited number of cycles under unilateral bending. The bending loads were presumably a consequence of leg oscillation during assisted perambulation.