Effect of the rate of cooling on the magnetic properties of an annealed eutectoid carbon steel . mentite in the resulting sorbitic and pearlitic structures actingboth as a magnetically harder medium and as a retarding agentfor the transformation from gamma to alpha iron. The first ofthese is more likely the predominant factor. The experiments of Howe 9 show a quite definite relationshipbetween the logarithm of the time of cooling from 800 to 6500 Cand the resulting structure of a eutectoid carbon steel. Whilethe results here presented show no mathematical relationshipbetween the cooling rates
Effect of the rate of cooling on the magnetic properties of an annealed eutectoid carbon steel . mentite in the resulting sorbitic and pearlitic structures actingboth as a magnetically harder medium and as a retarding agentfor the transformation from gamma to alpha iron. The first ofthese is more likely the predominant factor. The experiments of Howe 9 show a quite definite relationshipbetween the logarithm of the time of cooling from 800 to 6500 Cand the resulting structure of a eutectoid carbon steel. Whilethe results here presented show no mathematical relationshipbetween the cooling rates and the magnetic constants, there is,however, a marked correspondence. The maximum inductionincreases or decreases directly, and the coercive force, inversely,with the time of cooling from 800 to 6500 C. The residual induc-tion does not show as marked a relationship. Since both themagnetic constants and the metallographic structure are in- 8 T. D. Yensen, Univ. of Illinois EnsineerinR Experiment Station Bull. No. 72; 1914. 9 Howe and Levy, Jour Iron and Steel Inst , 94, pp. 210-232; 1916. 75. Fig. 8.—Micrograph of specimen 18, cooled in furnace from 800° C
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