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White Iron Specimen Preparation

White cast irons are hard and brittle wear-resistant metals consisting of pearlite and cementite. White cast irons are manufactured by chilling the surface of the cast mold in order to prevent the formation of graphite during solidification. White cast irons are used for train car wheels, brake shoes, shot blasting nozzles, mill liners, crushers, pump impellers and other abrasion resistant parts.

Specimen preparation is relatively straight forward for white cast iron.

SECTIONING

MAXCUT Abrasive blade (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

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

Water

5-10 lbs

200/200 rpm

Until plane
1 minute
1 minute
1 minute
1 minute

3 um DIAMAT diamond on TEXPAN polishing pad DIALUBE Purple Extender 5-10 lbs

200/200 rpm

3 minutes

1 um DIAMAT diamond on ATLANTIS polishing pad

DIALUBE Purple Extender

200/200 rpm

5-10 lbs

2 minutes

0.05 um Nanometer alumina on TRICOTE polishing pad

 

5-10 lbs

100/100 rpm

30 seconds


Metallographic White Iron

White Iron - Hypo Eutectic, 1000X (DIC), etchant: Picral

White metal metallographic microstructure

White Iron - Hyper Eutectic, 200X (DIC), etchant: Picral

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