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Download Transactions of the American Institute of Mining, Metallurgical and Petroleum Engineers Volume 44

Download Transactions of the American Institute of Mining, Metallurgical and Petroleum Engineers Volume 44

Transactions of the American Institute of Mining, Metallurgical and Petroleum Engineers Volume 44.cAmerican Institute of Mining
Transactions of the American Institute of Mining, Metallurgical and Petroleum Engineers Volume 44
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Author: American Institute of Mining
Number of Pages: 260 pages
Published Date: 01 May 2012
Publisher: Rarebooksclub.com
Publication Country: Miami Fl, United States
Language: Englishhttps://d3by36x8sj6cra.cloudfront.net/assets/images/book/large/9781/2369/9781236928733.jpg
Format: eBook
ISBN: 9781232197133
Download Link: Transactions of the American Institute of Mining, Metallurgical and Petroleum Engineers Volume 44
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This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1913 Excerpt: ...and 497). At the same time the heat supply from the precipitation and graphitization of cementite is greatly increased (p. 497). For the precipitation of the carbon-poor austenite from the carbon-rich molten tends to raise the carbou content of that molten rapidly further to the right of B'D'; and the farther it passes to the right of B'D' the greater the metastability and the more rapid the precipitation and graphitization of cementite. These heat evolutions combined suffice, even if the external conditions are such as to drain heat away relatively fast, to raise the temperature of the molten again to 1,135, so that it slides up BB' to B', but of course not beyond B', because the start to cross B'D' would arrest the metastabilizing of cementite and the heat evolution resulting from the precipitation and graphitization of that cementite, and without heat from this source a rise of temperature would be impossible. As the quantity of residual molten decreases, the heat of precipitation from it and the heat of graphitization cease to be able to hold the temperature as high as B'. As the temperature therefore sinks, the course of the molten is naturally along B'B, neither falling below B'B because this would further accelerate the precipitation of austenite and thus check the cooling, nor above it for that would arrest completely the precipitation of austenite, cut oft' this important source of heat, and drag the temperature instantly back to B'B. This cooling along B'B continues till the molten reaches B, the true eutectic temperature and dissolved carbon content for the molten. This arrival at SK, this substitution of the true solubility content for mere metastability because in excess of GK, so accelerates the precipitation of cementite (12) that the tempera...

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