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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
... This article provides a discussion on the metallographic techniques used for failure analysis, and on fracture examination in materials, with illustrations. It discusses various metallographic specimen preparation techniques, namely, sectioning, mounting, grinding, polishing, and electrolytic polishing...
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.pulp.c0089682
EISBN: 978-1-62708-230-3
... to be low. 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...
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
... 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. The consumable materials and the Di-Profiler were contained in a small “metallography kit...
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
... Edge Preservation Grinding Polishing Electrolytic Polishing Field Metallography Examination of Microstructures Fracture Profile Sections Manufacturing Related Failures Service Failures Rolling-Contact Fatigue References References 1. Vander Voort G.F. ( 1986...
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 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...
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
... 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 was performed using light microscopy, and micrographs of representative microstructures were taken. Visual...
Series: ASM Failure Analysis Case Histories
Volume: 3
Publisher: ASM International
Published: 01 December 2019
DOI: 10.31399/asm.fach.v03.c9001807
EISBN: 978-1-62708-241-9
... surface layer, for the measurement of the distribution at the half value of the width along the depth direction, was carried out first by mechanical grinding, polishing, and then by electrolytic polishing with 10% perchloric acid alcohol solution for about 30 s with the electric voltage applied being 30 V...
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 0.3 micron aluminum oxide slurry. The sample was electrolytically etched in a 10 percent oxalic acid solution by applying a voltage of 4V for approximately 30 seconds. The polished cross-section is shown under both low and high magnification in Figures 6 and 7 , respectively. Figure 6 shows...
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
... Semitrailers used to haul chemicals and food products are often made from type 316L stainless steel. In the manufacture of these trailers, 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...
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
...-magnification view of this area and reveals microcracks adjacent to the carbide particles. Figure 7 , taken from a polished specimen, shows corrosion product filling a crack. Fig. 5 SEM micrograph showing aligned dendrites and associated niobium carbide particles. Note crack following interdendritic...
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
..., 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. Optical and scanning electron microscopy were conjunctively...
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
... of the polished surfaces. The replicas revealed the presence of SCC, probably from atmospheric chlorides concentrating under the insulation. The cracks were transgranular, and some extended 50 mm (2 in.) in length. In Gulf Coast petrochemical plants, SCC under wet insulation is common, because the marine...
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
... electrolytically cleaned and then visually examined. Two fracture surfaces ( Fig. 2 and 3 ) exhibited thumbnail-like cracks; beach marks were evident on all the fractures. The deepest crack observed ( Fig. 3 ) had a depth of 6 mm (0.235 in.). The second specimen had a crack with a depth of 3.8 mm (0.150...
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
... inside surface 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...
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 Handbook Archive
Volume: 11
Publisher: ASM International
Published: 01 January 2002
DOI: 10.31399/asm.hb.v11.a0003522
EISBN: 978-1-62708-180-1
... corrosion), which is typically apparent from overall thinning and loss of metal Galvanic corrosion, which occurs when dissimilar metals are in electrical contact via an electrolyte (or less commonly, when similar metals are in electrical contact via either dissimilar electrolytes or even a similar...
Series: ASM Handbook
Volume: 11
Publisher: ASM International
Published: 15 January 2021
DOI: 10.31399/asm.hb.v11.a0006757
EISBN: 978-1-62708-295-2
... disc 20 Water 300 ∼180 ∼40 5–10 Fine grinding Composite disc 6 Lubricant 300 ∼100 ∼22 5–15 Polishing Fusible-backing nonwoven cloth 6 Lubricant 150 ∼150 ∼34 15–120 Hard synthetic cloth 3 Lubricant 150 ∼120 ∼27 15–120 Hard silk cloth 1 Lubricant 150 ∼90 ∼20 5...
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
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...