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electrolytic polishing

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Series: ASM Handbook Archive
Volume: 11
Publisher: ASM International
Published: 01 January 2002
DOI: 10.31399/asm.hb.v11.a0003532
EISBN: 978-1-62708-180-1
..., and electrolytic polishing. The article also describes the microstructure examination of various materials, with emphasis on failure analysis, and concludes with information on the examination of replicas with light microscopy. electrolytic polishing failure analysis field metallography fracture...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.chem.c9001162
EISBN: 978-1-62708-220-4
... such as electrolytic and hand polishing and the vibration method resulted in poor edge and crack edge definition due to material thickness. Etching experiments involved a grain surface attack and hence produced a rather strong surface relief from which the grain boundary cracks could again not clearly...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.process.c9001667
EISBN: 978-1-62708-235-8
... which included all of the consumables and the Di-Profiler. The equipment and consumble materials used in the on-site analysis are readily available in a well equipped metallurgical laboratory. No expensive dedicated field metallography equipment (such as a portable electrolytic polisher) was used...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.pulp.c0089682
EISBN: 978-1-62708-230-3
.... Investigation (visual inspection, and micrographs of sections with electrolytic etching using 10 N KOH and then again after re-polishing and etching with Murakami's reagent) supported the conclusions that the casting never received a proper solution anneal. Recommendations included possible corrosion-screening...
Series: ASM Handbook
Volume: 11
Publisher: ASM International
Published: 15 January 2021
DOI: 10.31399/asm.hb.v11.a0006765
EISBN: 978-1-62708-295-2
..., and/or a brief vibratory polish (use the same cloths and abrasives as for step 4) may be needed to produce perfect publication-quality images. Electrolytic Polishing Electrolytic polishing can be used to prepare specimens with deformation-free surfaces. The technique offers reproducibility and speed...
Image
Published: 01 December 1992
Fig. 6 Transgranular branching crack in blade prior to addition of weld buildup at blade-to-hub attachment. Titanium carbide/nitrate particles and their tracks from polishing are visible. Oxalic acid electrolytic etch. 50×. More
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.process.c9001178
EISBN: 978-1-62708-235-8
... Abstract Eight cylinderhead screws cracked after a short running time in motors. They were made of Fe-0.45C-1Cr steel, had rolled threads, were heat treated to 110 kg/sq mm tensile strength, and were electrolytically galvanized. All fractured at the root of the thread. The surfaces of fracture...
Series: ASM Failure Analysis Case Histories
Volume: 3
Publisher: ASM International
Published: 01 December 2019
DOI: 10.31399/asm.fach.v03.c9001825
EISBN: 978-1-62708-241-9
... in thermosetting epoxy and metallographically prepared. In addition, a transverse section of each tube section near the junction with the header was mounted and metallographically prepared. The prepared sections were examined as polished and after etching electrolytically in 10% oxalic acid. The examination...
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
... the sample with a water-cooled abrasive saw and vacuum mounting it in epoxy. The cured sample was ground through 600 grit abrasive paper, rough-polished with 6 micron diamond, then final polished using a 0.3 micron aluminum oxide slurry. The sample was electrolytically etched in a 10 percent oxalic acid...
Series: ASM Failure Analysis Case Histories
Volume: 1
Publisher: ASM International
Published: 01 December 1992
DOI: 10.31399/asm.fach.v01.c9001049
EISBN: 978-1-62708-214-3
..., the presence of niobium-bearing carbide particles associated with the dendrites, and a crack following the interdendritic path. Figure 6 is a high-magnification view of this area and reveals microcracks adjacent to the carbide particles. Figure 7 , taken from a polished specimen, shows corrosion product...
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
..., the inteiiors are polished to match the finish of the original steel, and great care is taken to avoid the formation of scratches and crevices that could serve as initation sites for corrosion. Often, however, the chemicals being hauled are not pure and contain contaminants that attack the stainless steel...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.steel.c9001224
EISBN: 978-1-62708-232-7
... the sections after the usual etching with V2A-Beize which only attacks the austenitic matrix, were first etched electrolytically in a 1:10 dilution of saturated ammonia water at a terminal voltage of 1.5 V. This served to dissolve the chromium carbide and color it by means of a brown precipitate. Immediately...
Series: ASM Failure Analysis Case Histories
Volume: 1
Publisher: ASM International
Published: 01 December 1992
DOI: 10.31399/asm.fach.v01.c9001059
EISBN: 978-1-62708-214-3
...) are used. The metal is finely polished with diamond paste down to a 0.25 µm (9.8 µin.) finish. When a scratch-free finish is attained, the material is etched electrolytically with 10% oxalic acid, and replicas of the surface are taken on 0.13 min (5 mil) acetate tape and transferred to glass slides...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.rail.c9001175
EISBN: 978-1-62708-231-0
... of the boiler was polished and etched with Fry-solution, which revealed parallel striations formed due to the cold bending of the plate. The zones of slip were concentrated around the rivet holes. The cracks were formed here. The structure examination proved that the cracks had taken an exactly intercrystalline...
Series: ASM Failure Analysis Case Histories
Volume: 2
Publisher: ASM International
Published: 01 December 1993
DOI: 10.31399/asm.fach.v02.c9001327
EISBN: 978-1-62708-215-0
... temperature and pulled apart in such a way that the fracture surface was undamaged. Multiple initiation sites were revealed. The cracks were typically half-moon shaped and covered with a tight, black adherent oxide film. The fracture surfaces were electrolytically cleaned and then visually examined. Two...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.modes.c9001696
EISBN: 978-1-62708-234-1
... to occur. The tubing was sectioned, mounted, and polished for metallographic examination. An austenitic microstructure was observed. Corrosion pitting and sulfide stringers (verified via EDX/S) were evident in the as-polished condition. The specimen was then electrolytically etched in a 10% oxalic acid...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.modes.c0048791
EISBN: 978-1-62708-234-1
... strength of 807 MPa (117 ksi), and the material should therefore meet the 517-MPa (75-ksi) tensile-strength requirement. A cross section was ground, polished, lightly etched in 10% oxalic acid, and examined optically. Intergranular cracks filled with oxide were observed to have depths up to about 8 mm...
Series: ASM Failure Analysis Case Histories
Volume: 3
Publisher: ASM International
Published: 01 December 2019
DOI: 10.31399/asm.fach.v03.c9001839
EISBN: 978-1-62708-241-9
... to observe the subsurface cracking and fissuring. The unetched, as-polished specimens were also concurrently examined under SEM at higher magnifications to garner more details about the defect. Metallographic specimens were eventually electrolytically etched in 10% oxalic acid solution at 6 V DC for 30 s...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.aero.c9001489
EISBN: 978-1-62708-217-4
... loading; the comparison is being made with the polished surfaces and the tensile specimen fracture surfaces. The inclusions in the failed retaining ring were compared with the ones in a similar component obtained from a used engine. In the case of the latter, a large number of fine and elongated (Mn, Cr...
Series: ASM Handbook
Volume: 11
Publisher: ASM International
Published: 15 January 2021
DOI: 10.31399/asm.hb.v11.a0006760
EISBN: 978-1-62708-295-2
... steel etched with electrolytic oxalic acid Erosion Turbulance and particulate in liquids can cause erosion, removing material with no corrosion product apparent. The surface exhibits bare metal. Erosion is usually classified as a type of wear ( Fig. 15 ). Fig. 15 (a) Erosion in copper...