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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 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...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.power.c9001559
EISBN: 978-1-62708-229-7
..., chloride, stress-corrosion cracking. Replacement decisions were based on the presence of SCC attack or heavy corrosion deposits indicative of extended exposure time to chloride-contaminated water. The existing uncracked pipe, about 75 percent of the piping in the system, was retained despite the presence...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.chem.c0048702
EISBN: 978-1-62708-220-4
.... Recommendations Injection of ferrous sulfate just upstream of the condenser can aid the formation of protective oxide films. From the preceding discussion, the most obvious corrective measure would be to eliminate sulfide contamination. The prime source of such contamination appears to be the accumulation...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.power.c0047645
EISBN: 978-1-62708-229-7
... to form and propagate in tension under the thermal stresses created by the repair-weld heat input. The crack resulted from contamination and embrittlement of a repair weld that had received inadequate gas shielding. Thermal stresses cracked the oxide-rich layer that formed. The gas-shielding accessories...
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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 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: 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 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 December 2019
Fig. 4 Interior surface of driver club head depicting weld contamination at separation surface. (Color figure online) More
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Published: 01 December 2019
Fig. 10 EDS spectrum of the region shown in Fig. 9 showing contaminant elements of Al and S along with expected iron oxide constituents More
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.homegoods.c0090445
EISBN: 978-1-62708-222-8
... the presence of contaminant material exclusively within the ABS resin used to mold the failed covers, and the thermograms suggested contamination with a PBT resin. Further TGA analysis showed the contamination was estimated to account for approximately 23% of the failed cover material. The conclusion...
Series: ASM Failure Analysis Case Histories
Volume: 2
Publisher: ASM International
Published: 01 December 1993
DOI: 10.31399/asm.fach.v02.c9001318
EISBN: 978-1-62708-215-0
... side. EDS analysis indicated the presence of mercury on the fracture surface and mercury was also detected using scanning auger microprobe (SAM) analysis. The mercury was accidentally introduced into the cylinders during a gas-blending operation through a contaminated blending manifold. Replacement...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.pulp.c0045911
EISBN: 978-1-62708-230-3
... (790 deg F). Metallographic sections, energy-dispersive x-ray spectra, chemical analyses, tensile tests, and Auger microscope analyses showed the failed bellows met the specifications for the material. However, investigation also showed entire oxide thickness was contaminated with relatively large...
Series: ASM Failure Analysis Case Histories
Volume: 2
Publisher: ASM International
Published: 01 December 1993
DOI: 10.31399/asm.fach.v02.c9001319
EISBN: 978-1-62708-215-0
... of a dished Fig. 5 Reshuffling of residual stresses after hacksaw cutting at a location in the straight portion of a dished end Fig. 6 Rust marks at sites of carbon steel contamination on the inside surface of a dished end Abstract Several type 304L stainless steel dished ends...