[PDF] Development Of Refractory Metal Sheet In The United States eBook

Author : I. Machlin
Publisher : Springer Science & Business Media
Page : 493 pages
File Size : 28,45 MB
Release : 2012-12-06
Category : Technology & Engineering
ISBN : 1468491202

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This publication documents Proceedings of the Symposium on Metal lurgy and Technology of Refractory Metal Alloys, held in Washington, D.C. at the Washington Hilton Hotel on April 25-26, 1968, under sponsorship of the Refractory Metals Committee, Institute of Metals Division, of the Metallurgical Society of AIME, and the National Aeronautics and Space Administration. The Symposium presented critical reviews of selected topics in refractory metal alloys, thereby contributing to an in-depth understanding of the state-of-the-art, and establishing a base line for further research, development, and application. This Symposium is fifth in a series of conferences on refractory metals, sponsored by the Metallurgical Society of AlME. Publications issuing from the conferences are valuable technical and historical source books, tracing the evolution of refractory metals from early laboratory alloying studies to their present status as useful engineering materials. Refractory metals are arbitrarily defined by melting point. A 0 melting temperature of over 3500 F was selected as the minimum for this Symposium, thus excluding chromium and vanadium, which logically could be treated with other refractory metals in Groups VA and VIA of the periodic table. The Refractory Metals Committee is planning reviews of chromium and vanadium in subsequent conferences.

Author : P. S. Duletsky
Publisher :
Page : 42 pages
File Size : 23,88 MB
Release : 1962
Category : Heat resistant alloys
ISBN :

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Extrusion techniques and processes developed at the experimental extrusion facility were used to provide wrought materials for other contractors AND GOVERNMENT AGENCIES. These techniques and processes helped to expedite alloy development programs in refractory metals. Improved lubrication techniques using Corning 7900 glass mixtures were developed for extruding refractory metals at 4000 F. The suitability of Zr oxide ceramic coated steel dies for extrusion at 4000 F was confirmed. Improved extrusion techniques give reproducible, good quality, round and rectangular bar extrusions at temperatures up to 4000 F and reduction ratios of 9.5 to 1. (Author)

Author : H. R. Ogden
Publisher :
Page : 44 pages
File Size : 28,40 MB
Release : 1961
Category : Heat resistant alloys
ISBN :

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A summary is presented of the status of the Department of Defense Refractory Metals SheetRolling Program to accelerate the development of production techniques for high-quality, consistent sheet products from the refractory metals (Nb, Mo, Ta, and W) and their alloys. The program includes: (1) development of sheet production techniques, (2) establishment of minimum data re uired to evaluate mill production, (3) evaluation of fabrication characteristics of the sheet produced, and (4) establishment of design data. Contracts were awarded for the development of sheet production techniques for all four refractory metals. One contract was awarded for the evaluation of Mo alloy sheet fabrication characteristics. (Author).

Author : D. J. Maykuth
Publisher :
Page : 108 pages
File Size : 29,2 MB
Release : 1966
Category : Fusion zone (Welding)
ISBN :

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This report summarizes the achievements on fourteen programs that were conducted in support of the Metals Sheet Rolling Program. These included programs for developing practices to produce large sheets from two grades of unalloyed tungsten (via powder metallurgy and arc melting, respectively), as well as for the Mo-0.5Ti, Mo-0.5Ti-0.1Zr-0.03C (TZM), Cb-10W-1Zr-0.1C (D-43), Cb-10W-2.5Zr (Cb-752), and Ta-30Cb-7.5V alloys. In addition, pilot sheet-rolling programs were also carried out for the Cb-27Ta-10W-1Zr (FS-85), Cb-5Mo-5V-1Zr (B-66), Ta-7W-3Re (GE-473), and Ta-9.6W-2.4Hf-0.01C (T-222) compositions.

Author : L. N. Hjelm
Publisher :
Page : 283 pages
File Size : 45,36 MB
Release : 1963
Category :
ISBN :

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Contents: Emittance measurements of disilicide-type coatings at the U.S. Naval Radiological Defense Laboratory, by N.J. Alvares Preliminary results of diffusion studies of commercially available coatings on Mo-0.5 Ti molybdenum alloy sheet at 2500F, by W.B. Lisagor Activities of Bell Aerosystems Company with refractory materials, by F.M. Anthony Recent developments at Martin Denver in the refractory composites area, by R.L. Wells Activity report of high temperature coating and material programs at AMF, by M.E. Browning Coating activities at Texas Instruments Incorporated, by P.F. Woerner NBS activities in high-temperature materials, by D.G. Moore A portfolio of experience in refractory metal protective systems, by D.H. Leeds Progress briefing for Refractory Composites Working Group Meeting 12-14 March 1963, by J.C. Ingram, Jr. Refractory coating research and development at U.S. Army Materials Research Agency (AMRA), by M. Levy Evaluation procedures for screening coated refractory metal sheet, by J.J. Gangler.

Author : Delbert H. Fisher
Publisher :
Page : 82 pages
File Size : 38,63 MB
Release : 1961
Category : Heat resistant alloys
ISBN :

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A system has been developed for determining the conventional mechanical properties of materials at temperatures up to 4000 F in vacuum. Techniques for obtaining stress-strain properties in tension and compression are described in this report. Strains are measured optically directly at the gate section to an accuracy of plus or minus 50 microinches per inch in a 2-inch gage section. An evaluation of the system was made using a Mo-0.5Ti bar material. Exploratory work was conducted on graphite and a refractory sheet metal. The results for these tests are included in the report. With the objective of developing a temperature source for use above 4000 F, experiments were conducted to produce and to evaluate tantalum carbide-coated graphite heaters. Good coatings of tantalum carbide were produced both on thin-wall cylindrical heaters and on spiral heaters. It was found that carbon contamination of the atmosphere occurred such that tungsten shields of tungsten specimens were attacked at temperatures under 5400 F. Possible means of improving carbide coatings are suggested.