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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

Until plane
1 minute

 

360 grit SiC paper
600 grit SiC paper
800 grit SiC paper
1200 grit SiC paper

Water

5-10 lbs

200/200 rpm

1 minute
1 minute
1 minute
1 minute

Metallographic individual polishing force

1 um DIAMAT diamond on GOLDPAD polishing pad

DIALUBE Purple Extender

5-10 lbs

200/200 rpm

2 minutes

Metallographic individual polishing force

0.05 um Nanometer alumina on TRICOTE polishing pad

 

5-10 lbs

100/100 rpm

30 seconds

Metallographic individual 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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3601 E. 34th St.
Tucson, Arizona 85713
+1-520-882-6598
FAX +1-520-882-6599
email: pace@metallographic.com
www.metallographic.com


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Metallographic
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PACE Technologies ® - 3601 E. 34th St., Tucson, AZ 85713, USA
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