Bulletin of the Bureau of Standards Volume 10, Nos. 204-222

Bulletin of the Bureau of Standards Volume 10, Nos. 204-222

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This historic book may have numerous typos and missing text. Purchasers can usually download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1914 edition. Excerpt: ...distinguishes A3 from A2; for the latter, as we have seen, the maxima of Ar2 and Ac2 coincide when the samples are compact and gas free. As to the effect of rate of heating or cooling upon the location of the critical ranges, it will be noted, Table 4, that for the rates here used, 0.060 to 0.350 per second (or 17 to 3 seconds per degree), there is no effect on the location of A2 (max) for the samples 25 and 26 premelted in vacuo, or for sample 22, ingot iron remelted in gas furnace, while for the untreated samples a fast rate accompanies a greater difference in Ac2-Ar2. For the A3 range the effect of rate is less pronounced for the untreated samples but appears to be appreciable for the premelted samples. Table 5 shows that reducing the rate to zero gives 769 0 for A2 ( = Ac2 = Ar2) for all samples; and for A3 we find for zero rate Ac3--Ar3--120 with Ac3 = 912 and Ar3 = 9000 on the average. TABLE 5 Maxima of Critical Ranges for Zero Rate--Preliminary Series It therefore appears that in spite of the wide variations noted in Table 4, the nature of the sample, whether or not gas free or whether in one or several pieces, does not influence the location of the maxima of the critical ranges when reduced to zero rate of heating and cooling. The definite series of observations is shown in Table 6, in which are recorded all the observations taken with the improved apparatus of Figs. 4, 5, and 6 on the samples here included. There are three samples of electrolytic iron, prepared by Messrs. Cain, Cleaves, and Schramm (F2, F2', F7); an electrolytic sample (F3), prepared by Langheim-Pfanhauser; another (F4), from Prof. C. F. Burgess; and one of ingot iron (Fi), from the American Rolling Mill Co., all of which were remelted in a gas furnace before...
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Product details

  • Paperback | 184 pages
  • 189 x 246 x 10mm | 340g
  • United States
  • English
  • black & white illustrations
  • 1236884442
  • 9781236884442