Effect of the rate of cooling on the magnetic properties of an annealed eutectoid carbon steel . Fig. 8.—Micrograph of specimen 18, cooled in furnace from 800° C. Fig. 9.—Micrograph of specimen ig, cooled slowly in furnace from 800° C 76 Scientific Papers of the Bureau of Standards [Vol. 17 fluenced by the rate of cooling, these constants should be usefulin the application of magnetic tests for determining the qualityand structure of steel. As already stated, the break in the reluctivity line increasinglyshifts toward the origin with slower cooling rates. In the air-cooled specimen, where the
Effect of the rate of cooling on the magnetic properties of an annealed eutectoid carbon steel . Fig. 8.—Micrograph of specimen 18, cooled in furnace from 800° C. Fig. 9.—Micrograph of specimen ig, cooled slowly in furnace from 800° C 76 Scientific Papers of the Bureau of Standards [Vol. 17 fluenced by the rate of cooling, these constants should be usefulin the application of magnetic tests for determining the qualityand structure of steel. As already stated, the break in the reluctivity line increasinglyshifts toward the origin with slower cooling rates. In the air-cooled specimen, where the structure consists largely of sorbitewith intervening patches of coarse pearlite, the break occurs atthe highest value of the magnetizing force. As the material isallowed to cool at various rates so as to form a gradation in struc-ture from sorbite to divorced pearlite, the break is shifted towardlower values of the magnetizing force. There is also a greaterdifference between the real and apparent maximum intensity ofmagnetization. In specimens 18, ig, and 21, where patches oflamellar pearlite exist, the shifting of the break toward the originis still m
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