Carnegie Scholarship Memoirs Volume 2

Carnegie Scholarship Memoirs 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. 1910 edition. Excerpt: ...of a nascent red heat, and this fall in the hardness repeats itself in almost all metallic alloys. Above 600 the interstrain of copper decreases slowly and less uniformly until 1000 is reached, when the hardness becomes normal. Brasses behave in a similar manner; their first fall in hardness appears to take place at a temperature rather lower than in the case of copper. In the samples investigated it was at about 250 (Fig. 62). The malleability of these alloys depends, as is well known, on the presence of the,3 constituent of brasses. It was possible by means of the method employed, not only to recognise the existence of these properties, but also to establish their effect quantitatively with some degree of accuracy. Bronzes do not appear to follow the same law as to interstrain in terms of the temperature. According to the few experiments which the author was able to carry out, it is possible to establish that interstrain hardness is maintained very nearly constant up to at least 300. Sometimes, even, there is a slight increase in the hardness at the latter temperature. The three examples given in Fig. 62 took this fact into consideration. They relate to unforgeable alloys, but the numerical values are approximate only. Alumim'um.--Aluminium appears to undergo interstrain uniformly, no matter what the temperature may be, up to a red heat. Sometimes increase in hardness was noticed in the vicinity of 300. Nielcel.--Interstrain in nickel increases with the temperature up to about 300, where the hardness attains a maximum; subsequently, the interstrain decreases until high temperatures are reached. The most rapid fall takes place at a nascent red heat, and continues up to a temperature of the hardening of steel. Nickel, therefore, more

Product details

  • Paperback | 82 pages
  • 189 x 246 x 4mm | 163g
  • United States
  • English
  • black & white illustrations
  • 1236993756
  • 9781236993755