. Transactions. is shown in Figs. 2 and 3,magnified respectively 50 and 100 diameters. The purelymartensitic character of the shell of the case will benoted, as well as the occurrence of troostite and its gradualincrease. In Fig. 2 the wide black band is pure martensitic grains owe their polyhedral form to theoriginal austenitic grains from which they are of the grains are surrounded by troostitic membranes. Treatment B.—Same as treatment A, but lasting 5 hr. Results.—Case of the same character, but measuring mm. inthickness and the martensitic portion mm. Tr
. Transactions. is shown in Figs. 2 and 3,magnified respectively 50 and 100 diameters. The purelymartensitic character of the shell of the case will benoted, as well as the occurrence of troostite and its gradualincrease. In Fig. 2 the wide black band is pure martensitic grains owe their polyhedral form to theoriginal austenitic grains from which they are of the grains are surrounded by troostitic membranes. Treatment B.—Same as treatment A, but lasting 5 hr. Results.—Case of the same character, but measuring mm. inthickness and the martensitic portion mm. Treatment C.—Same as treatment B, but the steel was allowed tocool slowly in the case-hardening furnace after the opera-tion. Results.—Approximate thickness of case, mm. The case consisted of sorbitic grains surrounded by free cementite and containing many cementite needles, as shown in Fig. 4. By referring to Fig. 1 it will be seen that in the presence NOTE ON THE CASE-HARDENING OF SPECIAL STEELS. 425. -Nickel-!Steel. Ni, SxRurxuRE OF Case. C, Per Cent. Case-HardenedMagnified 50 Diameters.
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Keywords: ., bo, bookcentury1800, bookdecade1870, booksubjectmineralindustries
