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Series: 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
... 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...
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.
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Published: 01 January 2002
Fig. 48 Artifacts generated by improper platinum sputter coating of a 4.6 mm (0.18 in.) diameter polycarbonate rotating beam fatigue specimen. This SEM view shows a pattern in the coating reminiscent of “mud-cracking.”
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in Thermomechanical Fatigue: Mechanisms and Practical Life Analysis
> Failure Analysis and Prevention
Published: 01 January 2002
Fig. 3 Coating-initiated TMF cracks propagating into the substrate material of a thin-walled blade. Courtesy of Ashok Koul, Life Prediction Technologies, Inc.
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Published: 01 January 2002
Fig. 11 FeS/SRB corrosion under disbonded polyolefin tape coating on a buried pipeline in a wet anaerobic location shows soft, black corrosion products rich in iron sulfides overlying severe pitting
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Published: 01 January 2002
Fig. 12 Adhesive delamination in thermally sprayed Al 2 O 3 coating
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Published: 01 January 2002
Fig. 13 Cohesive delamination in thermally sprayed WC-Co coating (backscattered electron image)
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Published: 01 January 2002
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Published: 01 January 2002
Fig. 16 Bulk deformation failure of WC-Co coating, indicating cracks in the middle of the wear track and substrate migration at the edge of the wear track
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Published: 01 January 2002
Fig. 20 Influence of normalized coating thickness on the performance of HVOF coating on 440C steel substrate (σ = 1840 MPa, or 267 ksi)
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Published: 01 January 2002
Fig. 19 Schematic diagram of a typical indentation formed in a ceramic coating under repetitive impact loading showing different failure zones. Source: Ref 35
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in Elevated-Temperature Life Assessment for Turbine Components, Piping, and Tubing
> Failure Analysis and Prevention
Published: 01 January 2002
Fig. 28 Coating life diagram calculated using computer program COATLIFE. The diagram shows the protective and failed regimes of MCrAlY-coated GTD-111 blade
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Published: 01 January 2002
Fig. 67 Effect of clay coating on cooling curves of steel test specimen quenched into still water at 30 °C (86 °F). Test specimen, JIS S45C steel cylinder (10 mm, or 0.40 in., diam × 30 mm, or 1.2 in., long)
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in Analysis of Hot Rolled Steel Transit Damage
> ASM Failure Analysis Case Histories: Improper Maintenance, Repair, and Operating Conditions
Published: 01 June 2019
Fig. 2 (a) A magnetite coating on hot rolled sheet, with fresh rust breaking through; (b) Hot rolled surface, about 60% covered with fresh rust; (c) Hot rolled steel, with all the original magnetite lost. Rust is beginning to darken where arrowed, to form hematite.
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in Metallurgical Investigation of a Turbine Blade and a Vane Failure from Two Marine Engines
> ASM Failure Analysis Case Histories: Offshore, Shipbuilding, and Marine Equipment
Published: 01 June 2019
Fig. 16 Coating features of the vane along the airfoil section. (a) Convex side showing intact coating and shrinkage porosity; (b) Coating-matrix interface along convex side; (c) Vane coating and coating-matrix interface along concave side.
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in Metallurgical Investigation of a Turbine Blade and a Vane Failure from Two Marine Engines
> ASM Failure Analysis Case Histories: Offshore, Shipbuilding, and Marine Equipment
Published: 01 June 2019
Fig. 17 Coating degeneration and corrosion attack in MAR-M302 vane along the concave airfoil side. (a) Fine cracking; (b) Subsurface shrinkage porosity; (c) Corrosion product penetration in the subsurface porosity.
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in Metallurgical Investigation of a Turbine Blade and a Vane Failure from Two Marine Engines
> ASM Failure Analysis Case Histories: Offshore, Shipbuilding, and Marine Equipment
Published: 01 June 2019
Fig. 18 EDX analysis of the coating and corroded area of MAR-M302 vane. (a) Al and S peaks observed in the coating; (b) Corroded fracture region showing Na, S, Al and Si peaks.
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Published: 15 January 2021
Fig. 48 Artifacts generated by improper platinum sputter coating of a 4.6 mm (0.18 in.) diameter polycarbonate rotating-beam fatigue specimen. This scanning electron microscope view shows a pattern in the coating reminiscent of “mud-cracking.”
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Published: 01 December 2019
Fig. 12 Cage section showing general microstructure and silver coating
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in Stress-Rupture Characterization in Nickel-Based Superalloy Gas Turbine Engine Components
> Handbook of Case Histories in Failure Analysis
Published: 01 December 2019
Fig. 6 Trailing edge yielding and aluminide coating wrinkling associated with stress-rupture cracking on turbine airfoils
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