SUPERALLOY FIBERS - MECHANICAL PROPERTIES VERSUS DRAWING TECHNIQUES.
AIR FORCE MATERIALS LAB WRIGHT-PATTERSON AFB OHIO
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An investigation was made of the mechanical properties of yarns formed by the modified Levi process encasement of each fiber in a matrix followed by encasing the whole bundle in the same matrix and the Air Force-Hoskins process enclosure of the entire bundle of fibers in a dissimilar alloy ribbon. As a base point in evaluating the fiber and yarn mechanical properties, data on single-drawn superalloy fibers are analyzed for comparison. The results of this analysis reveal that the properties of two types of multidrawn yarns when formed from an alloy similar to Chromel R are very comparable. The major differences noted are that one the modified Levi process 90 end yarn has broken filaments which are tied into the structure by the use of excessive twist up to 19 turns per inch and the other the Air Force-Hoskins process 100 end yarn has some interfilament welding and a rough fiber surface which without a coating will cause abrasive action in the yarn and thus loss in strength. Author
- Metallurgy and Metallography