Metallography Volume 2 by Samuel Leslie Hoyt
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Author: Samuel Leslie Hoyt
Page Count: 140 pages
Published Date: 13 Sep 2013
Publisher: Rarebooksclub.com
Publication Country: United States
Language: English
ISBN: 9781236790873
File Name: Metallography.Volume.2.pdf
Download Link: Metallography Volume 2
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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. 1921 edition. Excerpt: ...bare. (3) Quenched from 843C. in boiling water--2 bars. Com position: C = 0.50 per cent.; Si = 0.51 pel cent.; Mn = 0.79 per cent. Cr = 0.73 per cent. Reference: Kelly, G. E. Review, 1917, Vol. 20, p. 569, on permanent magnets. The effect of quenching on mild steel, such as is used in electrical machinery, is quite small, as has been shown by Gumlich. This 22000 21000 20000 N 110000 M '18U00 17000 16000.5 1.0 1.5 2.0 Percent Carbon Fio. 93.--KrTect of carbon and heat treatment on the magnetic saturation of steel. (Matthews.) Upper lino, after annealing tit 930C. Lower line, after quonehing from 850C. can also be seen by reference to Fig. 93. This figure also shows that as the carbon content increases the effect of hardening becomes much more pronounced. Work on heat treatment has brought out the important point that the magnetic properties of steel depend very greatly upon the microstructure, grain size of the pearlite, etc., and that therefore, it is quite insufficient to use the terms "annealed," "quenched," etc., to describe the treatment.1 Furthermore, the effect of heat treatment is variable and depends on the quality of the steel.2 Magnetic Testing.--That there is a definite relationship between the mechanical and thermal treatment of steel and its magnetic properties has been shown by Robin3 who gives rules and tables of data according to which the composition, thermal and mechanical treatments, of any article of regular shape of steel or nickel alloy can be determined from the chaiacteristic shapes of the magnetic curves. The Bureau of Standards has also done ccnsiderable and very valuable work in this field.4 This work is so important and of such a nature that the originals should be consulted for the details....
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