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Flanges, corrosion

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Series: ASM Failure Analysis Case Histories
Volume: 2
Publisher: ASM International
Published: 01 December 1993
DOI: 10.31399/asm.fach.v02.c9001336
EISBN: 978-1-62708-215-0
... Abstract Catastrophic pitting corrosion occurred in type 304L stainless steel pipe flange assemblies in an industrial food processor. During regular service the pumped medium was pureed vegetables. In situ maintenance procedures included cleaning of the assemblies with a sodium hypochlorite...
Series: ASM Failure Analysis Case Histories
Volume: 1
Publisher: ASM International
Published: 01 December 1992
DOI: 10.31399/asm.fach.v01.c9001060
EISBN: 978-1-62708-214-3
... was caused by intergranular corrosion/stress-corrosion cracks that initiated from the external surface of the pipe reducer section. Contributory factors were the sensitized condition of the flange and the concentration of corrosive elements from the bleach stock plant environment on the external surface...
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Published: 01 June 2019
Fig. 2 Tubercles and corrosion products at the ID surface of a flange. More
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Published: 01 December 1992
Fig. 2 Internal surface of the flange was free of corrosion. Several secondary stress-corrosion cracks penetrated the flange thickness. 1.5×. More
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Published: 01 December 1992
Fig. 6 Intergranular corrosion on the external surface of the flange and IGSCC in the weld HAZ. Note that the type 316 weld and the wrought stainless steel pipe section were unaffected by corrosion. 5×. More
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Published: 01 December 1992
Fig. 7 Intergranular corrosion at the external surface of the flange and IGSCC next to the flange fillet. 5×. More
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Published: 01 December 1992
Fig. 8 Intergranular corrosion at the external surface of the flange. The voids are the locations of the spalled grains. 50×. More
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.process.c9001421
EISBN: 978-1-62708-235-8
... deposit. While the fracture in the weld metal was of the ductile type exhibiting a fine fibrous appearance, that in the flange material was of the cleavage type. Microscopic examination revealed that the cracks were blunt-ended fissures of the type characteristic of corrosion-fatigue. It was concluded...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.aero.c0006428
EISBN: 978-1-62708-217-4
..., 217, and 250. Scanning electron microscopy (SEM) examination of the fractures showed that failure initiated by SCC or a corrosion pit on all failures examined. The failures then progressed by fatigue. Dye penetrant testing revealed no additional flaws on the wheels that had failed in the flange area...
Series: ASM Failure Analysis Case Histories
Volume: 3
Publisher: ASM International
Published: 01 December 2019
DOI: 10.31399/asm.fach.v03.c9001774
EISBN: 978-1-62708-241-9
... steel; the flange from type 321, and the ring gasket from 347. Examination revealed that the failure occurred by transgranular stress-corrosion cracking, initiated by the presence of polythionic acid. Detailed metallurgical investigation was subsequently conducted to identify what may have caused...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.aero.c0006406
EISBN: 978-1-62708-217-4
... Abstract A crack was found in an aircraft main wing spar flange fabricated from 7079-T6 aluminum alloy during a routine nondestructive x-ray inspection after the craft had logged 300 h. Scanning electron microscopy (SEM) revealed an intergranular fracture pattern indicative of stress-corrosion...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.usage.c9001249
EISBN: 978-1-62708-236-5
... Abstract The flanged bearing bush carrying the drive shaft of a feed pump suddenly fractured after about two years of service. The chemical composition was normal for high chromium ledeburitic cast steel, which was corrosion and wear resistant as well as refractory. For unknown reasons...
Series: ASM Failure Analysis Case Histories
Volume: 1
Publisher: ASM International
Published: 01 December 1992
DOI: 10.31399/asm.fach.v01.c9001071
EISBN: 978-1-62708-214-3
... kPa (150 psi) and 120 deg C (250 deg F) maximum in 93 to 99% sulfuric acid. The fracture originated at stress-corrosion cracks that occurred in a high-stress transition region at the valve body-to-flange juncture. The mechanical properties of the failed valve were below those of the manufacturer's...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.power.c9001679
EISBN: 978-1-62708-229-7
... Outside Diffuser Shot Peen 1988 EB 1 yes—erosion yes—corrosion and crack propagation no 1988 MP =12 yes—cavitation yes—corrosion and crack propagation no 1989 EB (cracked) =6 no corrosion product/no cracking yes—EB weld out on flange 1989 EB no no corrosion product...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.aero.c0047076
EISBN: 978-1-62708-217-4
... electron microscope fractographs, hardness testing, and electrical conductivity testing) supported the conclusions that the failure was caused by fatigue cracks originating on the inside curved surface of the flanges. The cracks had initiated in surface defects caused by either corrosion pitting or forming...
Series: ASM Failure Analysis Case Histories
Volume: 2
Publisher: ASM International
Published: 01 December 1993
DOI: 10.31399/asm.fach.v02.c9001308
EISBN: 978-1-62708-215-0
... flange such that the crack plane was perpendicular to the tangential direction of the turntable rail. There was no visible evidence of plastic deformation associated with the crack. The contact surfaces of the rail appeared worn and contained many shallow wear craters. Slight corrosion of the contact...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.chem.c0091617
EISBN: 978-1-62708-220-4
... cracks in the flange-to-cone weld and in the base metal of the cone were characteristic of chloride stress-corrosion cracks in type 316 stainless steel. There were two possible sources of chlorides: boiler feedwater and insulation. The boiler feedwater was an unlikely source because it was monitored...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.modes.c9001537
EISBN: 978-1-62708-234-1
... corrosion mechanism. It probably started at the root of the straightening crack and then extended into the flange. Though a fatigue mechanism was operative in Region 3, it was not the cause of the large crack. Rather, it merely assisted crack growth by the stress corrosion mechanism. Region 4, which...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.marine.c0091394
EISBN: 978-1-62708-227-3
... of austenitic stainless steel: the bottom surface, weld or HAZ pits, and crevices. Recommendations included proper material selection for piping, flanges, and weld rods with greater corrosion resistance. Proper filtering to prevent entrained abrasives and timely breakdown inspections were also advised...
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Published: 01 June 2019
Fig. 1 Aluminum alloy 2014-T6 aircraft nose wheel (a) that failed at the flange. (b) Close-up of tube well on wheel 31. (c) Appearance of flange failure on wheel 67. The topography is typical of other flange failures. (d) Close-up of wheel 31; note indentation (arrow). (e) Close-up of wheel More