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FABRICATION OF WIDE TUNGSTEN SHEET BY POINT DEFORMATION TECHNIQUES
WAH CHANG CORP ALBANY OREG
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Conical flow turn experiments were conducted with W blanks in a variety of starting conditions. Pressed and sintered, sintered and forged, sintered and rolled, and arc cast and rolled materials were all successfully flowed 25 into 90 degree cones. The lowest working temperature was 600 F for the arc cast and rolled W, while the highest was 1400 F for the as-sintered blanks. The feasibility of the form and weld approach to cylindrical blank preparation was demonstrated. Welded blanks, employing both Mo and W fillers in the joints, were successfully flow turned from 18-inch thick to as low as 0.013-inch thick. Some weld failure was evidenced but was eliminated by raising the blank temperature and decreasing the reduction on the first pass. Surface scaling occurred in the heat affected zone of the tungsten welded cylinders. Experimental flattening of a cylinder to produce sheet is described. Tensile specimens, taken from the flow turned sheet displayed good strength and ductility in both directions. Bend tests revealed a ductile-brittle transition occurring between 500 and 550 F. Author
APPROVED FOR PUBLIC RELEASE