The value of science in the smithy and forge by Cathcart William Hutton & Stead John Edward 1851-

Author:Cathcart, William Hutton & Stead, John Edward, 1851-
Language: eng
Format: epub
Tags: Blacksmithing, Forging
Publisher: London : C. Griffin & Co.
Published: 1916-03-25T05:00:00+00:00

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each class of steel should be known to the smith who is treating it.

84 SCIENCE IN THE SMITHY AND FORGE.

Practical Example to show the Effect of Incomplete Refining.

Some time ago I had a broken lathe centre placed in my hands; the appearance of the fracture is most peculiar (fig. 38); it has a very coarse structure, surrounded by an outer zone which is very much finer :

FIG. 38.—Broken lathe centre showing refined outer zone, coarse-centre portion, and blue circular part at right-hand side.

indeed one could be pardoned for taking it for a case-hardened specimen. Although the colour is not shown on the photograph, the half-moon portion is decidedly blue.

This was declared to be a very mysterious fracture, and consequently—and this is too often the case—the usual subterfuge was resorted to, that it must have been bad steel.

By applying to the problem what we have been considering about heat treatment and the conditions obtained above and below the critical point, I came to the following conclusions: that the method of making the

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