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Cast Iron
Specimen Preparation (Class 3 Procedures)
Metallographic Class 3 sample preparation  

Cast Irons are difficult materials to prepare properly because the graphite nodules or the graphite flakes are easily pulled out during preparation. By minimizing the sectioning damage and by starting with a modest grit size SiC paper, retaining these difficult particles can be accomplished.

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

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

POLISHING
Abrasive/surface Lubricant Force/ sample Speed
(Head/base)
Time Individual
Force mode
Central Force
mode
120 grit SiC paper
240 grit SiC paper*
Water
5-10 lbs 200/200 rpm Planar
1 min
  Metallographic central polishing force
360 grit SiC paper
600 grit SiC paper
800 grit SiC paper
1200 grit SiC paper
Water
5-10 lbs 200/200 rpm 1 min
1 min
1 min
1 min
Metallographic individual polishing force Metallographic central polishing force
1 um DIAMAT diamond
on GOLDPAD polishing pad
DIALUBE Purple
Extender
5-10 lbs 200/200 rpm 2 min Metallographic individual polishing force Metallographic central polishing force
0.05 um Nanometer alumina
on TRICOTE polishing pad
  5-10 lbs 100/100 rpm 30 sec Metallographic individual polishing force Metallographic central polishing force

*Required for central polishing force. Click here for more information on central vs. individual polishing force polishing.

Metallographic micrograph of nodular cast iron
Cast Iron, 2% nital etchant, 100X (DIC)
Metallographic micrograph of graphite flakes in cast iron
Graphite cast iron, 2% nital etchant, 500X

ETCHING

Common Etchants
PACE Technologies Recommended Etchants

PACE Technologies Etchant Database

CAUTION:Safety is very important when etching. Be sure to wear the appropriate protective clothing and observe all WARNINGS on chemical manufacuters SDS (Safety Data Sheets). Also review the COMMENTS and CONDITIONS Section for each etchant.


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