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Image
Dimpled rupture created by microvoid coalescence in a quenched and tempered...
Available to PurchasePublished: 01 January 2002
Fig. 9 Dimpled rupture created by microvoid coalescence in a quenched and tempered steel. Note the presence of carbide particles in the bottom of several dimples. Palladium shadowed two-stage carbon replica. Because the image is a replica of the fracture surface, there is a reversal
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Image
Microvoid coalescence in an aluminum-silicon alloy (A380) loaded in tension...
Available to Purchase
in Mechanisms and Appearances of Ductile and Brittle Fracture in Metals
> Failure Analysis and Prevention
Published: 01 January 2002
Fig. 17 Microvoid coalescence in an aluminum-silicon alloy (A380) loaded in tension. (a) Fracture surfaces consist of cleaved particles (i.e., silicon) and ridged fracture of the aluminum. 200×. (b) Higher-magnification (1440×) view of boxed region. (c) A fractured aluminum ligament surrounded
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Image
Dimpled rupture created by microvoid coalescence. Courtesy of Engineering S...
Available to PurchasePublished: 15 January 2021
Fig. 10 Dimpled rupture created by microvoid coalescence. Courtesy of Engineering Systems, Inc.
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Image
Microvoid coalescence in an aluminum-silicon alloy (A380) loaded in tension...
Available to Purchase
in Mechanisms and Appearances of Ductile and Brittle Fracture in Metals
> Failure Analysis and Prevention
Published: 15 January 2021
Fig. 17 Microvoid coalescence in an aluminum-silicon alloy (A380) loaded in tension. (a) Fracture surfaces consist of cleaved particles (i.e., silicon) and ridged fracture of the aluminum. Original magnification: 200×. (b) Higher-magnification (1440×) view of boxed region. (c) Fractured
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Image
Scanning electron micrograph (SEM) of microvoid coalescence that characteri...
Available to Purchase
in Metallurgical Failure Analysis of Titanium Wing Attachment Bolts
> ASM Failure Analysis Case Histories: Failure Modes and Mechanisms
Published: 01 June 2019
Fig. 4 Scanning electron micrograph (SEM) of microvoid coalescence that characterized the entire bolt fracture surface
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Image
Region showing elongated dimples (microvoid coalescence) in the exemplar to...
Available to Purchase
in Failure Analysis of a Spoon Broken by a Parapsychic Person
> ASM Failure Analysis Case Histories: Household Products and Consumer Goods
Published: 01 June 2019
Fig. 6 Region showing elongated dimples (microvoid coalescence) in the exemplar torsional load specimen.
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Image
Microvoid coalescence and transgranular fatigue region on the exemplar spec...
Available to Purchase
in Failure Analysis of a Spoon Broken by a Parapsychic Person
> ASM Failure Analysis Case Histories: Household Products and Consumer Goods
Published: 01 June 2019
Fig. 9 Microvoid coalescence and transgranular fatigue region on the exemplar specimen subjected to cyclic applied loads.
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Image
Microvoid coalescence and secondary cracks observed on the para spoon fract...
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in Failure Analysis of a Spoon Broken by a Parapsychic Person
> ASM Failure Analysis Case Histories: Household Products and Consumer Goods
Published: 01 June 2019
Fig. 10 Microvoid coalescence and secondary cracks observed on the para spoon fracture.
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Image
Microvoid coalescence and transgranular fatigue region on the para spoon fr...
Available to Purchase
in Failure Analysis of a Spoon Broken by a Parapsychic Person
> ASM Failure Analysis Case Histories: Household Products and Consumer Goods
Published: 01 June 2019
Fig. 11 Microvoid coalescence and transgranular fatigue region on the para spoon fracture.
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Image
in Failure Analysis of a Spoon Broken by a Parapsychic Person
> ASM Failure Analysis Case Histories: Household Products and Consumer Goods
Published: 01 June 2019
Fig. 12 Microvoid coalescence on the para spoon fracture.
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Image
in Failure Analysis of a Set of 1CrMoV Studs From a Steam Turbine and Techniques for Its Assessment
> ASM Failure Analysis Case Histories: Power Generating Equipment
Published: 01 June 2019
Fig. 6 Cavity coalescence at grain boundaries.
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Image
Crack formed by coalescence of creep cavities at carbide interfaces. Cavity...
Available to PurchasePublished: 01 December 1993
Fig. 5 Crack formed by coalescence of creep cavities at carbide interfaces. Cavity alignment follows dendritic arms.
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Image
(a) View of coalescence pit. (b) Magnified view of pit showing presence of ...
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in Failures of Pressure Vessels and Process Piping
> Analysis and Prevention of Component and Equipment Failures
Published: 30 August 2021
Fig. 74 (a) View of coalescence pit. (b) Magnified view of pit showing presence of possibly a sand particle
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Image
Scanning electron microscopy image showing microvoid coalescence in a fract...
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in Failure Analysis of Medical Devices
> Analysis and Prevention of Component and Equipment Failures
Published: 30 August 2021
Fig. 6 Scanning electron microscopy image showing microvoid coalescence in a fractured nitinol wire
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Image
Micrograph showing the initiation, propagation, and coalescence of multiple...
Available to PurchasePublished: 15 May 2022
Fig. 13 Micrograph showing the initiation, propagation, and coalescence of multiple environmental stress cracks. The individual cracks are separated by ridgelike crack unions.
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Image
SEM image that shows cup and cone and microvoid coalescence fracture morpho...
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in Failure Analysis of NiTi Wires Used in Medical Applications
> Handbook of Case Histories in Failure Analysis
Published: 01 December 2019
Fig. 1 SEM image that shows cup and cone and microvoid coalescence fracture morphology in a NiTi wire
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Image
Published: 01 December 2019
Fig. 4 Intentionally fractured blades revealed microvoid coalescence
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Book Chapter
Shear Band Failures in Threaded Titanium Alloy Fasteners
Available to PurchaseSeries: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.usage.c9001660
EISBN: 978-1-62708-236-5
.... The fractures propagated by microvoid coalescence typical of that observed in notched tensile specimen fractures of the same material. For comparison, Ti-6Al-4V fasteners from various commercial sources were tested to failure in uniaxial tension and examined in the SEM. In all cases, the fracture appearances...
Abstract
Failure analysis was performed on threaded Ti-6Al-4V fasteners that had fractured in the threads during installation. Scanning electron microscopy (SEM) and optical metallography revealed that the fractures initiated in circumferential shear bands present at the thread roots. The fractures propagated by microvoid coalescence typical of that observed in notched tensile specimen fractures of the same material. For comparison, Ti-6Al-4V fasteners from various commercial sources were tested to failure in uniaxial tension and examined in the SEM. In all cases, the fracture appearances were similar to that exhibited by the fasteners that failed during installation. In addition, results of optical microscopy indicated that the geometry and extent of the shear bands appeared to depend on the fabrication process employed by the individual manufacturers. Causes of shear band formation are discussed along with potential methods to eliminate these microstructural in homogeneities.
Book Chapter
Overload Failure of a Quench-Cracked AISI 4340 Steel Threaded Rod
Available to PurchaseSeries: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.process.c0049797
EISBN: 978-1-62708-235-8
... cracking observed in this alloy was caused during heat treating as the thread root served as an effective stress concentration and induced quench cracking. It was found that fracture in the overload region occurred by a ductile void growth and coalescence process. Premature failure of the threaded rod...
Abstract
An AISI 4340 threaded steel connecting rod that was part of a connecting linkage used between a parachute and an instrumented drop test assembly fractured under high dynamic loading when the assembly was dropped from an airplane. A large flaw that originated from the root of a machined thread groove was visible on the fracture surface. Heavy oxidation at elevated temperatures was indicated as most of the surface of the flaw was black. Fine secondary cracks aligned transverse to the growth direction was revealed by scanning electron microscopy. It was established that intergranular cracking observed in this alloy was caused during heat treating as the thread root served as an effective stress concentration and induced quench cracking. It was found that fracture in the overload region occurred by a ductile void growth and coalescence process. Premature failure of the threaded rod was thus attributed to the presence of the quench crack flaw caused by an improper machining sequence and heat treatment practice.
Book Chapter
Hydrogen Induced Cracking of a Tappet Adjusting Screw
Available to PurchaseSeries: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.process.c9001613
EISBN: 978-1-62708-235-8
... coalescence in the center. The improper baking after electroplating of the screw led to H2-induced blistering/cracking. The high strength of the threaded region of the adjusting screw increased the failure propensity. Electroplating 16MnCr5 DIN 17210 Hydrogen damage and embrittlement Surface...
Abstract
The electroplated tappet adjusting screws used in diesel engines failed during initial bend testing. The analysis of the failure showed that the fracture was nucleated from the subsurface of the screw. The fracture surface was intergranular at the ID and OD region and microvoid coalescence in the center. The improper baking after electroplating of the screw led to H2-induced blistering/cracking. The high strength of the threaded region of the adjusting screw increased the failure propensity.
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