White Iron
Specimen Preparation (Class 3 Procedures)
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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.
SECTIONING
MAXCUT Abrasive blade (MAX-D or MAX-VHS 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 |
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| 120 grit SiC paper 240 grit SiC paper* |
Water |
5-10 lbs | 200/200 rpm | Planar 1 min |
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| 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 |
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| 1 um DIAMAT diamond on GOLDPAD polishing pad |
DIALUBE Purple Extender |
5-10 lbs | 200/200 rpm | 2 min | |
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| 0.05 um Nanometer alumina on TRICOTE polishing pad |
5-10 lbs | 100/100 rpm | 30 sec | |
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*Required for central polishing force. Click here for more information on central vs. individual polishing force polishing.
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| White Iron - Hypo Eutectic, 1000X (DIC), etchant: Picral |
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| White Iron - Hyper Eutectic, 200X (DIC), etchant: Picral |
ETCHING
Common Etchants
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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