[PDF] Research On Workable Refractory Alloys Of Tungsten Tantalum Molybdenun And Columbium eBook

Author : CRUCIBLE STEEL CO OF AMERICA PITTSBURGH PA.
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Page : 1 pages
File Size : 50,32 MB
Release : 1961
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Studies were made to determine the potential of the W- and Ta-rich alloys of the W-Ta-Mo-Nb system for high-strength structural applications at temperatures above 2500 F. Twenty specific compositions, including binary, ternary, nd quaternary alloys were investigated. Creep and tension tests were conducted on the as-extruded samples at 3000 F in vacuum. The high-temperature strength of the W-rich alloys increased with the addition of Nb, and the high-temperature strength of the Ta-rich alloys increased with additions of Mo and W. 88.6 W - 5.7 Mo - 5.7 Nb alloy had a tensile strength of 62,000 psi at 3000 F; several alloy had tensile strengths in excess of 50,000 psi. These strengths were attained by a combination of solid-solution strengthening and strain hardening. (Author).

Author : F. H. Buttner
Publisher :
Page : 18 pages
File Size : 43,25 MB
Release : 1968
Category : Heat resistant alloys
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The memorandum discusses the supply, production, consumption, and applications of the refractory metals, columbium, tantalum, molybdenum, tungsten, and rhenium. Lists of manufacturers of mill products of these metals are included. (Author).

Author : H. E. Pattee
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Page : 28 pages
File Size : 47,56 MB
Release : 1962
Category : Brazing
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Many of the important developments in the joining of columbium, molybdenum, tantalum, tungsten, and graphite are summarized. Much of the subject matter is devoted to the brazing processes, but diffusion and solid-state bonding are covered also. The particular properties which recommend the refractory metals and graphite to aerospace applications are discussed. Adverse properties which limit the use of these materials or which must be overcome by using special precautions also are mentioned. Typical filler metals used to join the refractory materials for low- as well as high-temperature service conditions are covered. The information was gathered from the current literature on joining and from the open DMIC files.

Author : F. F. Schmidt
Publisher :
Page : 36 pages
File Size : 36,59 MB
Release : 1964
Category : Heat resistant alloys
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Studies on the effects of heat-treating and testing environments for the refractory metals have been limited primarily to the unalloyed metals and a few alloys of columbium and molybdenum. Most of this work has relied on compositional changes as a means of assesing the effects of various environments on these materials. It has been shown that all of these materials are subject to contamination or purification in various test environments. The residual gases H2, CO(or N2), and H20, constitute the major sources of contamination when testing columbium and tantalum materials in vacua. Under the same conditions, molybdenum and molybdenum alloys containing carbon and reactive-metal additions are subject to serious decarburization. Nonreactive gaseous atmospheres also cause serious changes in material chemistry, since small quantities of noxious gases are contained in the atmosphere. Several promising methods of circumventing material chemistry changes during various longtime, high-temperature exposures are being used and/or evaluated. (Author).

Author : D. L. Chase
Publisher :
Page : 44 pages
File Size : 30,63 MB
Release : 1965
Category : Heat resistant alloys
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This report summarizes the activities of the Refractory Metals Sheet Rolling Subpanel on Analytical Methods in a program initiated in 1960. The panel was formed to study the problems involved in determining interstitial and alloying elements in alloys of tungsten, molybdenum, tantalum, and columbium. The objectives of the Refractory Metals Sheet Rolling Subpanel on Refractory Metals were (1) to ascertain the agreement between laboratories one could expect in the determinations of interstitial and alloying elements in FS-85, TZM, T-111, and unalloyed tungsten; (2) to establish methods, through close control of variables, which would give results approximating certain goals for agreement between laboratories; and (3) to offer a forum for the interchange of information on techniques, apparatus, etc. The subpanel membership, the participating laboratories, and the complete results of the chemical analyses are presented in this report. (Author).