. Transactions. 1, 8,300 10,200 , 3 Si28 :30,200 3,000 15,900 1, 7,000l 8,000 3 Si 29 12,200 5,000 7,040 2, 6,300 7,100 3. Magnetic and Electrical Properties The results of the magnetic and electrical tests are shown in TablesIV and V and in Figs. 8 and 9. The latter show at a glance the magneticand electrical properties of the series, Fig. 8 after annealing at 900°C., VOL. LIII.—19 290 VACUUM-FUSED IRON WITH SPECIAL REFERENCE TO EFFECT OF SILICON and Fig. 9 after annealing at 1,100°C. Two maxima appear v
. Transactions. 1, 8,300 10,200 , 3 Si28 :30,200 3,000 15,900 1, 7,000l 8,000 3 Si 29 12,200 5,000 7,040 2, 6,300 7,100 3. Magnetic and Electrical Properties The results of the magnetic and electrical tests are shown in TablesIV and V and in Figs. 8 and 9. The latter show at a glance the magneticand electrical properties of the series, Fig. 8 after annealing at 900°C., VOL. LIII.—19 290 VACUUM-FUSED IRON WITH SPECIAL REFERENCE TO EFFECT OF SILICON and Fig. 9 after annealing at 1,100°C. Two maxima appear very dis-tinctly in the curves for maximum permeability, corresponding to twominima in the curves for hysteresis loss and coercive force. The firstof these points occurs at a silicon content of about per cent., and thesecond at a silicon content of about per cent. That a maximum—or minimum—^should occur for a low silicon con-tent was not surprising in view of the results previously obtained with. Fig. 2 3 4 Silicon Content- Per Cent -Magnetic and Electrical Properties op Iron-Silicon in Vacuo. Annealed at 900°C. pure iron, iron-carbon and iron-boron alloys. In the latter case amaximum was obtained with a trace of boron, evidently on account ofa slight purification of the iron, but as soon as the boron content becamemeasurable, the magnetic properties immediately depreciated. The firstmaximum in the present case can, no doubt, be accounted for in the sameway, and consequently this point may be regarded as characteristic ofthe purest iron obtainable under the present conditions, containing cent. siUcon and a small amount of oxygen in the form of iron oxide. T. D. YENSEN 291 The second maximum—or minimum—was wholly unexpected, asstrength and brittleness are not generally associated with high magneticquality. It is true that previous investigators^^ have found a maximumbetween and per cent, silicon, but this was thought to be d
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