Machinery Volume 23

Machinery Volume 23

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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. 1917 edition. Excerpt: ... it is impossible, as a rule, to quench or cool the steel quickly enough to retain it in this perfect dis solution state, and some of the constituents separate out of this solid solution. If the steel is cooled in liquid air, which is very cold, perfect austenite may be obtained in some cases. If the steel is cooled in water, such a close approximation to the solid solution cannot be obtained, and if cooled in kerosene, the approximation will be found to be even more imperfect. With heavy oil or air cooling, a still more imperfect solid solution is obtained. By looking at a specimen of hardened steel under the microscope, it is possible to determine just how close it is to the solid solution. The perfect solid solution is called austenite, the first stage in its decomposition is martensite, then come troostite, sorbite, and pearlite. Each of these states has its characteristic appearance under the microscope. It has been shown that by heating steel to the top of its critical range the steel is put in the solid-solution state, and by quenching in mediums of varying effectiveness the steel may be obtained in the cold state as a solid solution, or one of its decomposition products. But it is possible to obtain the exact decomposition product desired by heating to the top of the range, cooling rapidly enough to get austenite or martensite, and then reheating below the range so as to get troostite or sorbite. In other words, it is possible to obtain the steel in the exact state desired by simply hardening it with the proper rapidity, or by hardening and then reheating or drawing the steel. The hardening process converts the steel into a fine-grained solid solution (or to an approximation), and the drawing treatment lets the steel more

Product details

  • Paperback | 942 pages
  • 189 x 246 x 47mm | 1,647g
  • United States
  • English
  • black & white illustrations
  • 1236982576
  • 9781236982575