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Published: 01 December 2004
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Published: 01 December 2004
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Published: 30 September 2015
Fig. 10 Electrolytically etched 91W-6Ni-3Co polished section revealing intermetallics present in the matrix phase
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Published: 01 December 2004
Fig. 7 The as-cast microstructure of a Co/Cr/Mo alloy electrolytically etched with an ammonium persulfate and water solution ((NH 4 )S 2 O 8 and H 2 O) at 3–5 V for 5–10 s
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Published: 01 December 2004
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Published: 01 December 2004
Fig. 11 Portable electrolytic polishing/etching device being used to polish a region on a 304 stainless steel liquid nitrogen dewar. Note the polishing/etching cell and power source on the table at the bottom right and the metallographer holding the probe on the workpiece.
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Published: 01 December 1998
Series: ASM Handbook
Volume: 9
Publisher: ASM International
Published: 01 December 2004
DOI: 10.31399/asm.hb.v09.a0003777
EISBN: 978-1-62708-177-1
... Abstract This article describes various procedures used in the metallographic preparation of niobium, tantalum, molybdenum, and tungsten alloys. It provides information on sectioning, grinding, mounting, polishing, and electrolytic etching as well as alternate procedures that have been used...
Abstract
This article describes various procedures used in the metallographic preparation of niobium, tantalum, molybdenum, and tungsten alloys. It provides information on sectioning, grinding, mounting, polishing, and electrolytic etching as well as alternate procedures that have been used on refractory metals. The article presents and analyzes several micrographs, provides etchant formulas for various materials, and discusses the unique characteristics of rhenium and its alloys.
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in Metallography and Microstructures of Magnesium and Its Alloys
> Metallography and Microstructures
Published: 01 December 2004
Fig. 21 Comparison of (a) conventional etching and bright-field illumination with (b) electrolytic etching and polarized light illumination. Specimen is thixocast (semisolid process) AZ91. Electrolytic etching reveals individual grains by the coloration while retaining good contrast
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Published: 01 January 2002
Fig. 8 Heat-resistant alloy clamp for securing the hot air ducting system on fighter aircraft that failed by stress corrosion. (a) Configuration and dimensions (given in inches). (b) Section through the fracture area showing an intergranular crack. Electrolytically etched with oxalic acid. 540
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Published: 01 December 2004
Fig. 76 Haynes 151, as-cast. (a) Structure consists of dispersed islands of large primary carbide (M 6 C) in the α (face-centered cubic) matrix. Electrolytic etch: HCl and CrO 3 . Original magnification 200×. (b) Higher magnification, which reveals details of the M 6 C (note the lamellar form
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Published: 01 December 2004
Fig. 26 Idealized current density versus applied voltage for many common electrolytes. Regions for electrolytic etching and polishing are indicated.
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Published: 01 December 2004
Fig. 9 Zn-0.025Fe alloy, hot graphite mold, slow cooling. Zeta-phase intermetallic compounds. Electrolytic polish. Electrolytic etch: etchant 6, Table 1 (short time). 200×
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Published: 01 December 2004
Fig. 49 Alloy C95500 (aluminum bronze with 11.0% Al), with larger α grains and a greater amount of eutectoid decomposed β phase in the matrix than Figure 48 . Electrolytically etched in electrolyte 5, Table 5 . 250×
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Published: 01 December 2004
Fig. 48 Alloy C95500 (aluminum bronze with 11.5% Al), as sand cast. Small α grains (light gray, mottled) in matrix of retained β phase (white), with same eutectoid decomposed β phase (dark gray). Compare with Figure 49 . Electrolytically etched in electrolyte 5, Table 5 . 250×
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Published: 01 December 2004
Fig. 13 Microstructure of the 304 stainless steel dewar after polishing and etching with the device shown in Fig. 11 and Fig. 12 . Electrolytically etched in 10% oxalic acid solution. Original magnification 500×
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Published: 01 December 2004
Fig. 3 A typical etched microstructure of a 22Cr-13Ni-5Mn stainless steel alloy. Electrolytically etched with a (NH 4 )S 2 O 8 and H 2 O solution for approximately 1 min at 3–5 V
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in Elevated-Temperature Life Assessment
> Analysis and Prevention of Component and Equipment Failures
Published: 30 August 2021
Fig. 10 Type 304 stainless steel pipe microstructures in cross-section showing (a) intergranular attack on the surface, and (b) the pipe microstructure after a sensitization screening etch. Original magnification: 500×. Electrolytically etched with 10% oxalic acid solution
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in Metallography and Microstructures of Stainless Steels and Maraging Steels[1]
> Metallography and Microstructures
Published: 01 December 2004
after high-temperature exposure, where σ phase has precipitated. (c) Etched with aqueous 60% HNO 3 at 1 V dc to reveal the phase boundaries (arrows point to particles of σ). (d) Specimen etched as in (c) and given a second electrolytic etch with aqueous 20% NaOH at 2 V dc to color the σ particles. (e
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Published: 01 January 2002
Fig. 58 Intergranular corrosion. (a) Sample from a cast stainless steel neck fitting. (b) Region adjacent to the intergranular corrosion revealing extensive σ-phase precipitation at grain boundaries; electrolytic etching using 10 N KOH. (c) Same area as (b) after repolishing and etching
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