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with our present knowledge


Fig. 2 — Alumina inclusions in a bar of American steel
Fig. 3 — Alumina pits appearing in the form of short scratches
(as presented in scan; border reconstructed)
illustrating George F. Comstock. “A Study of Inclusions of Alumina in Steel.” The Foundry (May 1917) : 197-202
University of Michigan copy, digitized April 25, 2011

subtitle :
With our present knowledge we cannot be sure that alumina particles will not segregate in castings or ingots

or even take flight; could be a flock of birds.

10 March 2014

alumina; inclusions; metallurgy; scratches; steel
G. F. Comstock