Submitted by curator on Fri, 10/16/2015 - 11:49
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Inv. 33-3-156
Awl
A complete section across the tip: magnification, 400x
Etchant: Potassium bichromate + alcoholic ferric chloride
(Sn, <0.014%; As, 0.084%; Ni, 0.11%)
The microstructure consists of fine polyhedral grains that, in their twinning and distortion, indicate a treatment of annealing after heavy cold-working. The numerous globular inclusions and/or pores, in their alignment, reflect the direction of deformation that working produced.
Microhardness VHN: 62 ± 6 (n=5)
Uniform; data scatter (with the VHN ranging 151 to 126) is most likely due to the presence of microstructural porosity.
NOTE that this was the lowest microhardness measured in our Gawra metallurgical study, the mean VHN for the site being 121 ± 34 (n=30)
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