. Transactions. Fic. 5.—Nickel-Steel. Xi, ; C, Per Cent. Case-Hardened. STRUCTrRE OF Ca>E. MAGNIFIED 100 Fig. 6.—Same Steel as in Fig. 5. Same Treatment. >[agnified oUO Diameters. NOTE ON THE CASE-HARDENING OF SPECIAL STEELS. 427 per cent, of nickel some per cent, of carbon isneeded in order that the steel may be martensitic after air-cooling. It will be evident from the structure of theslowly-cooled sample (Fig. 4) that at least that amount ofcarbon had been introduced. Conclusions.—Steel containing some per cent, of nickelcan be made martensitic by
. Transactions. Fic. 5.—Nickel-Steel. Xi, ; C, Per Cent. Case-Hardened. STRUCTrRE OF Ca>E. MAGNIFIED 100 Fig. 6.—Same Steel as in Fig. 5. Same Treatment. >[agnified oUO Diameters. NOTE ON THE CASE-HARDENING OF SPECIAL STEELS. 427 per cent, of nickel some per cent, of carbon isneeded in order that the steel may be martensitic after air-cooling. It will be evident from the structure of theslowly-cooled sample (Fig. 4) that at least that amount ofcarbon had been introduced. Conclusions.—Steel containing some per cent, of nickelcan be made martensitic by case-hardening followed byair-cooling. Slow cooling in the furnace produces a sor-bito-cementitic case. Other Treatments.—The same steel was case-hardened, usingcrushed bone, but the results were much less satisfactory. Steel No. 5. Origin.—Mckel-steel supplied by the Peerless Motor Car Co., ofCleveland, Ohio. Shape.— round bars. Chemical Composition.—W\,4:.%Q; C, ; P, ; S, ;Mn, per cent. Treatment A.—Annealed for 5 hr. at a temperature of 1,000° C,surrounded by a mixture composed o
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Keywords: ., bo, bookcentury1800, bookdecade1870, booksubjectmineralindustries
