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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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UNS R56401
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UNS R56401
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Series: ASM Failure Analysis Case Histories
Volume: 3
Publisher: ASM International
Published: 01 December 2019
DOI: 10.31399/asm.fach.v03.c9001801
EISBN: 978-1-62708-241-9
... fixation device fracture surface damage titanium alloy notches roughness metallography fatigue crack growth rates ASTM F136 (alpha-beta titanium alloy) UNS R56401 Introduction The Harrington rod, developed in 1953 by Paul Harrington, a professor of orthopedic surgery at Baylor College...
Abstract
Both rods in a Harrington rod cervical stent failed after a short time in service. Metallurgical analysis revealed a significant number of notches as well as enlarged grain size in one of the two rods, rough shallow-cracked surfaces along the bend profiles, possible signs of corrosion, and fractures (on both rods) near indentations imparted by retaining clamps. The observations suggest that surface roughness and bending defects initiated cracking that led to the fatigue failure of the compromised rod, followed some time later by the overload fracture of the second rod.
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
... , 1989 ) 10.17226/1359 10. ASTM F136-02 , Standard Specification for Wrought Titanium-6 Aluminum—4 Vanadium ELI (Extra Low Interstitial) Alloy for Surgical Implant Applications (UNS R56401) , ( ASTM , West Conshohocken , 2002 ) 11. McEvily A.J. , Metal Failures, Mechanisms...
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.