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Iron-Cobalt-Nickel Alloys Specimen Preparation

Metallographic etchant database

Superalloys are high-performance alloys which exhibits excellent mechanical strength and creep resistance at high temperatures, good surface stability, and corrosion and oxidation resistance. The base element in Superalloys are nickel, cobalt, nickel-iron.

Iron-cobalt-nickel alloys are relatively easy to polish by standard metallographic techniques. However, the results can be significantly improved by using finely graded nanometer alpha alumina polishing solutions.

SECTIONING

MAXCUT Abrasive blade (Cat. No. MAX-C or MAX-I series)

MOUNTING
Compression Mounting with Phenolic, Epoxy or Diallyl Phthalate compression mounting resins

POLISHING

Abrasive/surface

Lubricant

Force/ sample

Time

240 grit SiC paper
360 grit SiC paper
600 grit SiC paper

Water

5-10 lbs

Until plane
1 minute
1 minute

9 um DIAMAT diamond on POLYPAD polishing pad

DIALUBE Purple Extender

5-10 lbs

2 minutes

6 um DIAMAT diamond on TEXPAN polishing pad

DIALUBE Purple Extender

5-10 lbs

2 minutes

1 um DIAMAT diamond on GOLDPAD polishing pad

DIALUBE Purple Extender

5-10 lbs

2 minutes

0.05 um Nanometer alumina on TRICOTE polishing pad

 

5-10 lbs

1 minute


Metallographic micrograph of Fe-Ni-Co-Al superalloy

Fe-Ni-Co-Al Alloy, 400X (Polarized Light)


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