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31-52-261 Micrograph

 

Inv. 31-52-261
Holdfast or handle
A cut across the end of the narrow foot of the clip: magnification, 200x
Etchant: Klemm’s III
(Sn, <0.031%; As, 1.17%; Ni, 0.051%)

The microstructure consists of polyhedral grains that, in their twinning and slight distortion, are indicative of an annealing treatment after a moderate amount of cold-working. Globular-shaped and mottle-textured inclusions are dispersed relatively lightly throughout the interior (cf., the inclusion density in micrographs for the two sickles, 32-21-100 and 32-21-102).

Microhardness VHN: 108 ± 6 (n=5)
Uniform; data scatter (with the VHN ranging 114 to 100) seems to be a genuine record of variation in grain size within the blade’s body.