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31-52-230 Micrograph

 

Inv. 31-52-230
Chisel, square-sectioned
A notch cut from one edge, 70 mm from the working end: magnification, 200x
Etchant: Klemm’s III
(Sn, 7.4%; As, 0.95%; Ni, 0.085%)

The microstructure consists of polyhedral grains that, in their twinning and lack of distortion, are indicative of annealing after at most a light cold-working. Inclusions are small and scattered throughout the metal without any particular orientation.

Microhardness VHN: 128 ± 3 (n=5)
Very uniform; what microstructural evidence there might have been of deliberate working of this tool’s edges most likely is now lost to corrosion.