American Society for Testing Materials, Vol. 20 (Classic Reprint)
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| Hersteller: | Forgotten Books (Materials, American Society for Testing) |
| Stand: | 2015-08-04 03:50:33 |
Produktbeschreibung
Excerpt from American Society for Testing Materials, Vol. 20 By G.W. Sargent. Historical. From the following excerpt which is taken from Helmet and Body Armor in Modern Warfare, by Bashford Dean of the Metropolitan Museum of Art, New York City, it is evident that even as early as approximately 1330 A.D., molybdenum was used in the manufacture.of steel, though perhaps not knowingly. As this is written I learn from my friend. Dr. M.Mayajima of Tokyo, this interesting point, which he in turn had from the metallurgist, Dr. O.Kochi of the Faculty of Technology of the Imperial University of Tokyo. It appears that years ago a German steel expert analyzed a part of a sword blade made by the famous Japanese artist, Masamune (1330 =t=)and he discovered that the rare element molybdenum, doubtless as an impurity, in a certain proportion. This led the discoverer to determine the local source of Masamune salloy iron; thereupon he purchased this iron in large lots, much to the surprise of the Japanese who later, when they analyzed captured German cannon, decided where a part at least of the molybdenum ore was obtained. The early investigators of the effects of the addition of molybdenum to iron or steel, stated such steels were red short: Thus Thomas Blair in 1894, wrote of a case where LOper cent of molybdenum rendered good iron red short and utterly worthless; and John A. Mathews reports having found two steels containing 1.87 percent and 2.99 percent of molybdenum, respectively, both low in carbon, unforgeable, while a third steel with 0.95 percent of molybdenum did not develop this red short feature, although it was seamy. Mathews, however, added he did not beHeve the results obtained were due to the Tungsten and Chromium Alloys. Journal, Iron and Steel Inst., 1902. About the Publisher Forgotten Books publishes hundreds of thousands of rare and classic books. Find more at www.forgottenbooks.com This book is a reproduction of an important historical work. Forgotten Books uses state-of-the-art technology to digitally reconstruct the work, preserving the original format whilst repairing imperfections present in the aged copy. In rare cases, an imperfection in the original, such as a blemish or missing page, may be replicated in our edition. We do, however, repair the vast majority of imperfections successfully; any imperfections that remain are intentionally left to preserve the state of such historical works.
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