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Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.process.c0045918
EISBN: 978-1-62708-235-8
... Abstract Cracks, with no other damage, were observed in a niobium alloy (Nb-106) part when it was pulled from several months of protective storage for assembly into a rocket nozzle. SEM views showed the cracks to be intergranular, with contaminant particles on a large number of the grain facets...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.process.c0045926
EISBN: 978-1-62708-235-8
... to contaminants less than 10 nm thick, surface analysis is often necessary to solve adhesion problems. In this example, it was necessary not only to identify the contaminant but also to determine whether the contamination occured before or after a chromate conversion surface treatment. Investigation...
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Published: 01 January 2002
Fig. 1 SEM image of flaky metallic contaminants determined to be a mix of steel and aluminum particles by backscatter mode image. (a) Secondary electron imaging mode where particles are not distinguished by composition. (b) Image from backscatter mode, which shows the lower atomic number More
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Published: 01 December 1993
Fig. 7 EDXA chart of contaminants on bellows surface, showing significant peaks for chlorine and phosphorus More
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.process.c0047641
EISBN: 978-1-62708-235-8
... for the exterior surface of the weld. A segmented backup ring with a gas channel was used inside the vessel to shield the weld root. The pressure vessel failed due to contamination of the fusion zone by oxygen, which resulted when the gas shielding the root face of the weld was diluted by air that leaked...
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Published: 01 January 2002
Fig. 35 Intergranular corrosion of a contaminated E-Brite ferritic stainless steel weld. Electrolytically etched with 10% oxalic acid. 200× More
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Published: 01 January 2002
Fig. 2 Picral-etched specimen of structural steel that was exposed to contaminated agricultural ammonia showing nonbranched stress-corrosion cracks. 75× More
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Published: 01 June 2019
Fig. 4 EPMA spectrum obtained from a contaminated intergranular fracture area on the bend of a failed Inconel 600 bellows. More
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Published: 01 January 2002
Fig. 22 Near-surface contaminant particles visible using 30 kV accelerating voltage More
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Published: 01 January 2002
Fig. 3 Auger electron spectroscopy map of calcium contamination on stainless steel surface. Field of view, 1 μm More
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Published: 01 June 2019
Fig. 2 Intergranular corrosion of a contaminated E-Brite ferritic stainless steel weld. Electrolytically etched with 10% oxalic acid. 200× More
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Published: 01 June 2019
Fig. 1 Ti-5Al-2.5Sn gas-turbine fan duct that failed because of contamination of a repair weld in an arc weld in the front flange-duct segment. (a) The circumferential 75-mm (3-in.) crack in the repair weld in the arc weld. 1.5×. (b) Longitudinal section through the repair weld showing More
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Published: 01 June 2019
Fig. 11 Contamination by Acid: In this shipment from Europe, a survey prior to loading revealed seepage and a positive result for a chloride spot test. Note that these coils had been descaled. When the coils arrived in Malaysia six weeks later, there was unusually severe corrosion in the same More
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Published: 01 June 2019
Fig. 19 Contamination by Seawater: The steel plates shown here (a) were carried on a ship which caught fire off Singapore. The fire was fought with seawater, and by the time the plates were removed there was very visible corrosion (see far right) and a claim was made for 80% damage allowance More
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Published: 01 June 2019
Fig. 20 Contamination by Fertilizer: This shipment of hot rolled pipe exhibited unusual corrosion upon discharge. Inquiries revealed there were fertilizer (ammonium chloride) and steelmaking additions stored above the pipe in the hold. The porous, granular steel-making addition stuck More
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Published: 01 December 1993
Fig. 6 Rust marks at sites of carbon steel contamination on the inside surface of a dished end More
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Published: 15 January 2021
Fig. 35 Intergranular corrosion of a contaminated E-Brite ferritic stainless steel weld. Electrolytically etched with 10% oxalic acid. Original magnification: 200× More
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Published: 15 January 2021
Fig. 5 A backscattered electron image showing surface contamination of a failed copper bourdon tube in a pressure regulator allows for targeted chemical analysis of the contamination. 23×, 20 kV accelerating voltage. Courtesy of C. Wright, NASA More
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Published: 15 January 2021
Fig. 22 Near-surface contaminant particles visible using 30 keV accelerating voltage More
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Published: 01 December 2019
Fig. 4 Interior surface of driver club head depicting weld contamination at separation surface. (Color figure online) More