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Search Results for ASTM F75
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Retrieved screw of cast cobalt-chromium.molybdenum alloy (type ASTM F75). (...
Available to PurchasePublished: 01 January 2002
Fig. 7 Retrieved screw of cast cobalt-chromium.molybdenum alloy (type ASTM F75). (a) Defective screw threads from casting deficiencies. (b) Longitudinal section through threads showing porosity. 15×. (c) Enlarged thread of section shown in (b) with gas holes, segregation of primary phases
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Image
Broken hip prosthesis of cast type ASTM F75 cobalt-chromium-molybdenum allo...
Available to PurchasePublished: 01 January 2002
Fig. 33 Broken hip prosthesis of cast type ASTM F75 cobalt-chromium-molybdenum alloy. (a) Radiograph of total hip prosthesis. Circular wire marks acetabulum component made from plastics. Arrows (from top to bottom) indicate the area where the prosthesis stem is loosening at the collar, a stem
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Image
Retrieved screw of cast Co-Cr-Mo alloy (type ASTM F75). (a) Defective screw...
Available to PurchasePublished: 01 January 2002
Fig. 10 Retrieved screw of cast Co-Cr-Mo alloy (type ASTM F75). (a) Defective screw threads from casting deficiencies. (b) Longitudinal section through threads showing porosity. 15×. (c) Enlarged thread of section shown in (b) with gas holes, segregation of primary phases, and dissolved oxides
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Image
Broken hip prosthesis of cast type ASTM F75 cobalt-chromium-molybdenum allo...
Available to Purchase
in Broken Stem of Femoral Head Component of Total Hip Prosthesis Made From Cast Cobalt-Base Alloy
> ASM Failure Analysis Case Histories: Medical and Biomedical Devices
Published: 01 June 2019
Fig. 1 Broken hip prosthesis of cast type ASTM F75 cobalt-chromium-molybdenum alloy. (a) Radiograph of total hip prosthesis. Circular wire marks acetabulum component made from plastics. Arrows (from top to bottom) indicate the area where the prosthesis stem is loosening at the collar, a stem
More
Image
Retrieved screw of cast Co-Cr-Mo alloy (type ASTM F75). (a) Defective screw...
Available to Purchase
in Retrieved Bone Screw Made From Co-Cr-Mo Alloy with Casting Defects
> ASM Failure Analysis Case Histories: Medical and Biomedical Devices
Published: 01 June 2019
Fig. 1 Retrieved screw of cast Co-Cr-Mo alloy (type ASTM F75). (a) Defective screw threads from casting deficiencies. (b) Longitudinal section through threads showing porosity. 15×. (c) Enlarged thread of section shown in (b) with gas holes, segregation of primary phases, and dissolved oxides
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Book Chapter
Retrieved Bone Screw Made From Co-Cr-Mo Alloy with Casting Defects
Available to PurchaseSeries: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.med.c0089543
EISBN: 978-1-62708-226-6
... Abstract Threads of a bone screw (Co-Cr-Mo alloy, type ASTM F75) had broken off, and other threads had cracked. 15x sectioning showed porosity, and 155x magnification showed gas holes, segregation, and dissolved oxides. This supports the conclusion that manufacturing defects caused the failure...
Abstract
Threads of a bone screw (Co-Cr-Mo alloy, type ASTM F75) had broken off, and other threads had cracked. 15x sectioning showed porosity, and 155x magnification showed gas holes, segregation, and dissolved oxides. This supports the conclusion that manufacturing defects caused the failure.
Book Chapter
Broken Adjustable Moore Pins Made From Cobalt-Chromium Alloy
Available to PurchaseSeries: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.med.c0048399
EISBN: 978-1-62708-226-6
... on the fracture surface of this pin. Thus, the effect of different conditions of cobalt-chromium alloys on failure behavior was demonstrated as a result of this study. Grain boundaries Surgical implants ASTM F75 Brittle fracture Two of four adjustable Moore pins, which had been used to stabilize...
Abstract
Two of four adjustable Moore pins, which had been used to stabilize a proximal femur fracture, were found to be broken and deformed at their threads. The pins were made from a cobalt-chromium alloy and were not in the same condition. Brittle precipitates in the grains and grain boundaries were seen in one of the pins and hence the fracture was revealed to have occurred along the grain boundaries. The other pin made from cold-worked cobalt-chromium alloy was observed to have randomly lines of primary inclusions. Intermingled dimples and fatigue striations were exhibited on the fracture surface of this pin. Thus, the effect of different conditions of cobalt-chromium alloys on failure behavior was demonstrated as a result of this study.
Image
Two broken Moore pins from cobalt-chromium alloy. (a) Longitudinal section ...
Available to PurchasePublished: 01 January 2002
through screw and nut. The nut shows as-cast structures of cobalt-chromium-molybdenum alloy (type ASTM F75). 160×. (d) Longitudinal section of the other broken pin in the cold-worked condition with fewer grain-boundary precipitates, lines of primary inclusions, and a small surface crack (there were more
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Image
Two broken Moore pins from cobalt-chromium alloy. (a) Longitudinal section ...
Available to Purchase
in Broken Adjustable Moore Pins Made From Cobalt-Chromium Alloy
> ASM Failure Analysis Case Histories: Medical and Biomedical Devices
Published: 01 June 2019
through screw and nut. The nut shows as-cast structures of cobalt-chromium-molybdenum alloy (type ASTM F75). 160x. (d) Longitudinal section of the other broken pin in the cold-worked condition with fewer grain-boundary precipitates, lines of primary inclusions, and a small surface crack (there were more
More
Book Chapter
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.med.c0048423
EISBN: 978-1-62708-226-6
... propagated through a larger gas pore by a ruptured gas pore. The stresses created through the fatigue process activated glide systems which served the formation of secondary cracks along glide planes. Crack propagation Porosity Slip planes Surgical implants ASTM F75 Fatigue fracture In a 65...
Abstract
The bone cement failed at the distal end of the prosthesis stem of femoral head prosthesis six months after implantation. A small indentation on the lateral contour of the stem was visible where the stem had broken. The degree of loosening (gap between the lateral stem contour and the bone or cement) and implant loading was revealed by the dislocation of fragments of the prosthesis. Secondary cracks that had originated at the lateral aspect of the stem were revealed by metallographic examination of a section parallel to the stem surface and perpendicular to the fracture surface of the distal fragment. Gas pores are apparent in the grain and at the grain boundaries were revealed by a transverse section. Fine parallel line structures that run diagonally through the fractograph may be slip traces were revealed by scanning electron microscopy. One of the cracks was revealed to have propagated through a larger gas pore by a ruptured gas pore. The stresses created through the fatigue process activated glide systems which served the formation of secondary cracks along glide planes.
Book Chapter
Shearing Fracture of a Type 316LR Stainless Steel Screw
Available to PurchaseSeries: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.med.c0048403
EISBN: 978-1-62708-226-6
... of the micrograph. 62× For comparison, the shearing fractures of a commercially pure titanium screw and a cast cobalt-chromium-molybdenum alloy (ASTM F75) screw are shown in Figures 2 and 3 . The spiral-textured fracture surface of the titanium screw was smooth ( Fig. 2a ) and had uniform, shallow...
Abstract
During the internal fixation, the type 316LR stainless steel cortical bone screw failed. Extensive spiral deformation was revealed by the fracture surface. Dimple structure characteristic of a ductile failure mode was observed with dimples oriented uniformly in the deformation direction. A zone of heavily deformed grains at the fracture edge was revealed by longitudinal metallographic examination. The shearing fractures of a commercially pure titanium screw and a cast cobalt-chromium-molybdenum alloy were discussed for purpose of comparison.
Book Chapter
Failure of the Bond Between a Cobalt Alloy Prosthetic Casting and a Sintered Porous Coating
Available to PurchaseSeries: ASM Failure Analysis Case Histories
Volume: 1
Publisher: ASM International
Published: 01 December 1992
DOI: 10.31399/asm.fach.v01.c9001133
EISBN: 978-1-62708-214-3
... not occur during the sintering thermal cycle. It was recommended that the prosthetic manufacturer investigate atmosphere controls for all thermal cycles prior to coating. Adhesion Bonding strength Interface reactions Powder coating Surgical implants ASTM F75 UNS R30075 Surface treatment related...
Abstract
A femoral knee implant was returned to the casting vendor for analysis after exhibiting poor bond strength between the cast substrate and a sintered porous coating. Both the coating and the substrate were manufactured from a cobalt-chromium-molybdenum alloy. Metallographic analysis indicated that a decarburized layer existed on all surfaces of the casting, which prevented bonding during the sintering thermal cycle. Bead-to-bead bonding within the coating appeared sufficient, and no decarburized layer was present on the bead surfaces. It was concluded that the decarburization did not occur during the sintering thermal cycle. It was recommended that the prosthetic manufacturer investigate atmosphere controls for all thermal cycles prior to coating.
Series: ASM Handbook Archive
Volume: 11
Publisher: ASM International
Published: 01 January 2002
DOI: 10.31399/asm.hb.v11.a0001819
EISBN: 978-1-62708-180-1
... of mechanical weakness from gas holes, brittleness, and dissolution of oxides. With today's advanced casting techniques and testing methods, such implant defects can be avoided and eliminated. Fig. 7 Retrieved screw of cast cobalt-chromium.molybdenum alloy (type ASTM F75). (a) Defective screw threads...
Abstract
This article commences with a description of the prosthetic devices and implants used for internal fixation. It describes the complications related to implants and provides a list of major standards for orthopedic implant materials. The article illustrates the body environment and its interactions with implants. The considerations for designing internal fixation devices are also described. The article analyzes failed internal fixation devices by explaining the failures of implants and prosthetic devices due to implant deficiencies, mechanical or biomechanical conditions, and degradation. Finally, the article discusses the fatigue properties of implant materials and the fractures of total hip joint prostheses.
Book Chapter
Failures Related to Casting
Available to PurchaseSeries: ASM Handbook Archive
Volume: 11
Publisher: ASM International
Published: 01 January 2002
DOI: 10.31399/asm.hb.v11.a0003508
EISBN: 978-1-62708-180-1
... and eliminated. Fig. 10 Retrieved screw of cast Co-Cr-Mo alloy (type ASTM F75). (a) Defective screw threads from casting deficiencies. (b) Longitudinal section through threads showing porosity. 15×. (c) Enlarged thread of section shown in (b) with gas holes, segregation of primary phases, and dissolved...
Abstract
This article focuses on the general root causes of failure attributed to the casting process, casting material, and design with examples. The casting processes discussed include gravity die casting, pressure die casting, semisolid casting, squeeze casting, and centrifugal casting. Cast iron, gray cast iron, malleable irons, ductile iron, low-alloy steel castings, austenitic steels, corrosion-resistant castings, and cast aluminum alloys are the materials discussed. The article describes the general types of discontinuities or imperfections for traditional casting with sand molds. It presents the international classification of common casting defects in a tabular form.