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preferential weld metal corrosion

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Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.chem.c9001395
EISBN: 978-1-62708-220-4
... was at such a distance from the weld that the heat of welding could have raised the metal temperature to 550 to 700 deg C (1292 deg F). The corrosion of the shell material which occurred at the shell side of the weld under the backing ring is also an example of crevice corrosion. Leakage Sensitization Storage...
Series: ASM Failure Analysis Case Histories
Volume: 1
Publisher: ASM International
Published: 01 December 1992
DOI: 10.31399/asm.fach.v01.c9001034
EISBN: 978-1-62708-214-3
... magnification, along with semiquantitative analysis of microscopic residue and particles remaining in the pits. Figures 3 and 4 show the features exhibited by the pits located in the weld. Preferential attack occurred at one phase in the weld metal that consisted of ferdte and austenite. Preferential...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.modes.c9001683
EISBN: 978-1-62708-234-1
... of ferrite phase along with loss of austenite grains. However, the appearance is subject to interpretation. Fig. 4 Polished/etched section of weld metal at boundary of void in Figure 3 . Preferential corrosion is evident. 300×. Another weld, shown in Figure 5 , has a rather poor appearance...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.chem.c9001655
EISBN: 978-1-62708-220-4
... areas of carbide precipitation and carbon levels in excess of 0.03% that were not necessarily related to welds. These areas would act as preferential corrosion sites if they occurred at the surface. The majority of the areas that we found had the highest concentration of carbides at the center...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.auto.c9001704
EISBN: 978-1-62708-218-1
... a single penetration horizontal seam weld contained a relatively large teardrop-shaped cavity in the HAZ ( Figure 8 ). In this case, the corrosion did not appear to preferentially attack the delta ferrite-rich bands in the base metal. Fig. 8 Cross-section through an unusually large teardrop shaped...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.petrol.c0047606
EISBN: 978-1-62708-228-0
... of failure mechanisms. The weld itself had been perforated by pitting corrosion. Preferential attack of the cast structure of the weld is shown in Fig. 1(b) . The high chromium interdendritic region was the last to dissolve. The adjacent base metal had stress-corrosion cracks that extended through the pipe...
Image
Published: 01 June 2019
Fig. 4 Polished/etched section of weld metal at boundary of void in Figure 3 . Preferential corrosion is evident. 300×. More
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.design.c9001223
EISBN: 978-1-62708-233-4
... Abstract The corner of a welded sheet construction made from austenitic corrosion-resistant chromium-nickel steel showed corrosive attack of the outer sheet. This attack was most severe at the points subjected to the greatest heat during welding. Particularly large amounts of weld metal had...
Series: ASM Failure Analysis Case Histories
Volume: 2
Publisher: ASM International
Published: 01 December 1993
DOI: 10.31399/asm.fach.v02.c9001325
EISBN: 978-1-62708-215-0
... demonstrates clearly that there was no preferential corrosion of the weld metal or heat affected zones. Figure 7 , a photomicrograph of the microstructure at the root of one of the reticular grooves in the 3-in. pipe, shows clearly that these grooves resulted from corrosion rather than thermal fatigue...
Series: ASM Failure Analysis Case Histories
Volume: 1
Publisher: ASM International
Published: 01 December 1992
DOI: 10.31399/asm.fach.v01.c9001070
EISBN: 978-1-62708-214-3
...) specimens in a lead-lined tank equipped with copper coils that had served in this function prior to construction of the new tanks. Both materials exhibited virtually no corrosion and no preferential weld attack. Type 316L was selected for the project. The subsequent corrosion was the result...
Image
Published: 30 August 2021
Fig. 48 Preferential corrosion of the vermicular ferrite phase in austenitic stainless steel weld metal. Discrete ferrite pools that are intact can be seen in the lower right; black areas in the upper left are voids where ferrite has been attacked. Electrolytically etched with 10% ammonium More
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.bldgs.c9001171
EISBN: 978-1-62708-219-8
... corroborates the preferential attack at the grain boundaries and shows that some grains are completely detached. Fig. 7 Intercrystalline attack. Grains detached. 50 × All that indicates, therefore, that the intermediate region, between the weld metal and the starting points of corrosion...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.pulp.c9001393
EISBN: 978-1-62708-230-3
... of affairs arising from the presence of a small anode and a large cathode, which would lead to preferential corrosion of the plastically deformed metal. This susceptibility to corrosion would be enhanced by the plastically deformed metal, which is itself anodic with respect to undeformed metal and therefore...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.power.c9001609
EISBN: 978-1-62708-229-7
... confirmed intergranular corrosion and cracking in the type 430 weld metal and in the HAZ on the tube side of the joint ( Fig. 7 , 8 ). Corrosion proceeded preferentially at the lower-Cr-content martensitic phase that formed preferentially along the grain boundaries. The Rockwell hardness values shown...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.auto.c9001182
EISBN: 978-1-62708-218-1
... was welded on to the valve seat. Fracture was a consequence of fatigue corrosion cracking, itself strongly promoted by the presence of sulphur compounds. The origin of these corrosive sulphur compounds could not be explained. Automotive components Exhaust valves Sulfur compounds Valve steel...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.modes.c9001674
EISBN: 978-1-62708-234-1
... noble metal, gold, was being corroded preferentially to a much more reactive alloy, the Pb-Sn-In solder. The obvious conclusion that the corrosion was due to a complexing agent, specific for gold amongst the available metals, was difficult to prove because of the small amount of corrosion product...
Series: ASM Failure Analysis Case Histories
Volume: 3
Publisher: ASM International
Published: 01 December 2019
DOI: 10.31399/asm.fach.v03.c9001832
EISBN: 978-1-62708-241-9
... particulate air filters. The failure analysis investigation concluded that nitrate-induced stress-corrosion cracking was the cause of the failure. vent pipe nitrate-induced stress-corrosion cracking welding defects galvanized low-carbon steel MnS inclusions ion-coupled plasma-emission spectroscopy...
Series: ASM Handbook Archive
Volume: 11
Publisher: ASM International
Published: 01 January 2002
DOI: 10.31399/asm.hb.v11.a0003556
EISBN: 978-1-62708-180-1
... is often focused on the weld material or at the fusion line for the weld ( Fig. 12a ). Pit surfaces are often described as dendritic, consistent with preferential corrosion ( Ref 63 , 71 , 72 , 73 ), but the preferential attack of a single phase need not be a feature of MIC. From detailed study of UNS...
Series: ASM Failure Analysis Case Histories
Volume: 2
Publisher: ASM International
Published: 01 December 1993
DOI: 10.31399/asm.fach.v02.c9001337
EISBN: 978-1-62708-215-0
... properties. References References 1. Metals Handbook, Vol. 11: Failure Analysis and Prevention , 9th ed. , ASM , Metals Park, OH , 1986 , p 603 – 614 . 2. Emerson R.W. and Morrow M. , Trans. ASME , Vol. 68 , 1946 , p 605 . 3. Port R.D. , “Non-Weld-Related...
Series: ASM Handbook
Volume: 11
Publisher: ASM International
Published: 15 January 2021
DOI: 10.31399/asm.hb.v11.a0006783
EISBN: 978-1-62708-295-2
... region, which prevents the corrosion deterioration of the more active metal. This cathodic protection practice can be accomplished through the use of sacrificial metals, such as magnesium or zinc, which act as the more active member and will corrode preferentially while providing cathodic protection...