. Transactions. 700° d= mm. 750° c?= 800° C. 850° C. Brin. , d = mm. Brin. , d= mm. Fig. 16.—Etched with ammoxi.\ and hydrogen peroxide. X 75. 448 A COMPARISON OF GRAIN-SIZE MEASUREMENTS rolled metal the drop in Brinell hardness indicates softening of the metaljust before the new grains are seen; that the softening of lightly rolledmetal progresses considerably before any new crystals can be detected;that the Brinell hardness of all specimens agrees closely from 600° 850° C. As the previous anneal of the original hard specim
. Transactions. 700° d= mm. 750° c?= 800° C. 850° C. Brin. , d = mm. Brin. , d= mm. Fig. 16.—Etched with ammoxi.\ and hydrogen peroxide. X 75. 448 A COMPARISON OF GRAIN-SIZE MEASUREMENTS rolled metal the drop in Brinell hardness indicates softening of the metaljust before the new grains are seen; that the softening of lightly rolledmetal progresses considerably before any new crystals can be detected;that the Brinell hardness of all specimens agrees closely from 600° 850° C. As the previous anneal of the original hard specimens wasabout 650° C. the conclusion is drawn, and borne out by experience, thatboth the Brinell hardness and the grain size of annealed metal are greatlyaffected by the grain size due to the anneal previous to the anneal underdiscussion; and, as the grain size of the previous anneal diminishes, theBrinell hardness curves and the grain-size curves will approach thoseof metal annealed after very hard rolling as a limit; , in Fig. 1, thecurve marked per cent, redu
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Keywords: ., bo, bookcentury1800, bookdecade1870, booksubjectmineralindustries
