Publisher's Synopsis
Excerpt from Effect of the Rate of Cooling on the Magnetic and Other Properties of an Annealed Eutectoid Carbon Steel, Vol. 17
As already stated, the break in theireluc'tivity line increasingly shifts toward the origin with slower cooling rates. In the air cooled specimen, where the structure consists largely of sorbite with intervening patches of coarse pearlite, the break oc'curs at the highest value 'oi the magnetizing force. As the material is allowed to cool at various rates so as to form a gradation in struc ture from sorbite to divorced pearlite, the break is shifted toward lower values of the magnetizing force. There is also a greater difference between the real and apparent maximum. Intensity of magnetization. In specimens 18, 19, and 21, Where patches of lamellar pearlite eiéist, the shifting of the break toward the Origin is still more pronounced, all oi. The breaks occurring at approxi mately the same magnitude of the field values. There is also the largest difference between the real and apparent values of the maximum intensity of magnetization. The break in the reluctivity line occurs at the lowest field value in specimen 20, where the pearlite is most completely divorced. For a more complete degree of divorcing (the spheroidal state) the break would probably occur at still lower values of the magnet izing force. This shifting is very likely due not only to changes in the magnetic broperties of the ferrite matrix, one of the magnetic constituents, but also to the _change in the ?ux distribution produced by theehangé in the1arrangement of the cementite relative to the ferrite.
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