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Nickel Hastelloy Superalloy Specimen Preparation

Temperature and corrosion resistant materials such as Hasteloy Nickel Based Superalloys are prepared mostly with standard metallographic techniques. However, the results can be significantly improved by using finely graded CMP (chemical mechanical polish) polishing solutions on a high napped polishing pad.

SECTIONING

MAXCUT Abrasive blade (Cat. No. MAX-E or MAX-VHS 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
800 grit SiC paper
1200 grit SiC paper

Water
Water
Water
Water
Water

5 lbs
5 lbs
5 lbs
5 lbs
5 lbs

Until plane
1 minute
1 minute
1 minute
1 minute

1 um DIAMAT diamond on ATLANTIS polishing pad

DIALUBE Purple Extender

5 lbs

3-5 minutes

CMP polishing slurry on MICROPAD polishing pad (vibratory polishing is recommended for final step)

 

5 lbs

30-60 seconds (standard polishers)

10-15 minutes (vibratory polishing)


Metallographic micrograph of etched stainless steel
Hastelloy etched with Adlers etchant, Mag. 200X (DIC). Composition: Molybdenum: 8-10%, Chromium: 20.5-23%, Iron: 17-20%, Tungsten: 0.2-1%, Cobalt: 0.5-2.5%, Carbon: 0.05-.015%, Silicon: 1%, Manganese: 1%, Boron: 0.01%, Phosphorus: 0.04%, Sulfur: 0.03%, Nickel: Remainder

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