Development of Workable Molybdenum- and Tungsten-base Alloys PDF Download
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Author: M. Semchyshen Publisher: ISBN: Category : Materials at high pressures Languages : en Pages : 86
Book Description
A number of complex molybdenum-, molybdenumtungsten-, and tungsten-base alloys were consolidated by the vacuum-arc-casting technique. Successful extrusions were realized from all of the vacuum-arc-cast ingots. Extrusion constants well above those of earlier experiments were measured, indicative of the good elevated-temperature strength and concomitant high resistance to extrusion of the materials studied. Rolled bars were studied from the standpoint of recrystallization behavior, transition temperature, tensile properties as a function of temperature and, to a limited extent, creep-rupture properties. A carbon synergism was studied in the alloys Mo + 3% Ti + 0.5% Zr and Mo + 25% W + 1.25% Ti + 0.1% Zr from the standpoint of elevated temperature strength. In the case of both alloys, the carbon contents yielding the highest elevated temperature strengths also resulted in the highest transition temperatures as measured by the tensile test. An alloy based on Mo-50% W, and containing 0.8% Ti and 0.3% Zr, displayed exceptionally high strengths at elevated temperatures. The tensile transition temperature of this material was, however, above room temperature. (Author).
Author: M. Semchyshen Publisher: ISBN: Category : Materials at high pressures Languages : en Pages : 86
Book Description
A number of complex molybdenum-, molybdenumtungsten-, and tungsten-base alloys were consolidated by the vacuum-arc-casting technique. Successful extrusions were realized from all of the vacuum-arc-cast ingots. Extrusion constants well above those of earlier experiments were measured, indicative of the good elevated-temperature strength and concomitant high resistance to extrusion of the materials studied. Rolled bars were studied from the standpoint of recrystallization behavior, transition temperature, tensile properties as a function of temperature and, to a limited extent, creep-rupture properties. A carbon synergism was studied in the alloys Mo + 3% Ti + 0.5% Zr and Mo + 25% W + 1.25% Ti + 0.1% Zr from the standpoint of elevated temperature strength. In the case of both alloys, the carbon contents yielding the highest elevated temperature strengths also resulted in the highest transition temperatures as measured by the tensile test. An alloy based on Mo-50% W, and containing 0.8% Ti and 0.3% Zr, displayed exceptionally high strengths at elevated temperatures. The tensile transition temperature of this material was, however, above room temperature. (Author).
Author: M. Semchyshen Publisher: ISBN: Category : Languages : en Pages : 101
Book Description
Solid-solution-strengthened tungsten-base alloys were vacuum-arc-cast with relatively large additions of tantalum, Columbium, and/or molybdenum. Machined blanks from the ingots were extruded to round bar stock at temperatures from 3600 to 4000 F. Extrusion recoveries varied considerably from heat-to-heat. Elevated-temperature tensile tests were performed on specimens machined from available extruded bar stock. Strengths were well above those reported for unalloyed tungsten, but were below those resulting from earlier studies on dispersion-strengthened tungsten-base alloys. Molybdenum-base alloy sheets were prepared representing two compositions and three thermomechanical histories. Compositions studied were Mo + 1.25% Ti + 0.3% Zr + 0.1% C (TZC), and Mo + 0.3% Zr + 0.03% C. The thermomechanical variables imposed were solution heat treatments at various stages during the working schedules. Recrystallization behavior, bend transition temperatures, and tensile properties were quite sensitive to working schedules. Earlier work at this Laboratory indicated that in-process solution treatments at temperatures sufficiently high to effect increases in tensile strength usually resulted in increased transition temperatures. The present work has shown that a much more favorable trade-off between strength and transition temperature can result from the proper placement of the solution treatment in the working schedule.
Author: North Atlantic Treaty Organization. Advisory Group for Aeronautical Research and Development Publisher: ISBN: Category : Confrences Languages : en Pages : 612
Author: Publisher: ISBN: Category : Languages : en Pages : 110
Book Description
The W-Ta-Mo-Cb alloy system was previously investigated, and several tungsten- and tantalumrich alloys were developed and evaluated in the form of extruded bars. Many of these alloys exhibited very high strengths at 3000 F. Effort was aimed at producing and evaluating alloys from the W-Ta-Mo-Cb system in the form of sheet (Phase I) and increasing its high-temperature strength by the formation of dispersed carbides (Phase II). For Phase I, small cylindrical ingots of six selected alloys and unalloyed tungsten were consumable vacuum arc- melted by a multiple electrode technique and successfully extruded to sheet bars. Two alloys and unalloyed tungsten were rolled to sheet and recrystallization temperatures, bend transition temperatures, and high- temperature tensile properties were determined. The other four alloys could not be rolled to sheet by the techniques attempted. Experiments under phase II resulted in the development of a successful technique for consumably vacuum arc melting 88W-12Cb alloys that contained small amounts of vanacium, zirconium, and carbon. These alloys showed 2500 F tensile strengths at 49,000 to 57,000 psi--this constituted a twofold increase in strength above that of the base solid solution composition.
Author: J. L. Ratliff Publisher: ISBN: Category : Research and development projects Languages : en Pages : 70
Book Description
Government-sponsored tungsten research and development efforts encompass a broad rage of technological activities. Typifying the extreme limits of efforts since January, 1960, studies have ranged from preparation of unalloyed metal to development of high-integrity fabricated shapes of tungsten-base materials. Nine major areas outline the broad over-all effort, and each is summarized within this report by brief technical discussions of 104 separate studies on 79 research programs. Included are preparation of metal, consolidation, primary and secondary working, joining, fabrication and performance of rocket nozzles, oxidation and other high-temperature reactions, protective coatings, properties, and physical metallurgy.
Author: OFFICE OF NAVAL RESEARCH ARLINGTON VA. Publisher: ISBN: Category : Languages : en Pages : 20
Book Description
Contents: Session I -- Molybdenum as a Structural Material - The Potential and Future of Molybdenum and Its Alloys, Properties and Applications of Commercial Molybdenum and Molybdenum Alloys; Session II -- Preparation and Fabrication of Molybdenum and its Alloys - Consolidation of Molybdenum by Powder Metallurgy Practice, Arc - Melting Molybdenum, Working of Molybdenum and Its Alloys, Joining of Molybdenum and its Alloys; European Developments on Molybdenum - Vacuum-Sintered and Vacuum-Cast Molybdenum Alloys, Molybdenum Research and Development in Great Britain; Session III -- Metallurgy of Molybdenum and Molybdenum-Base Alloys - The Ductile-to-Brittle Transition in Molybdenum, The Influence of Carbon, Oxygen, and Nitrogen on the Ductility of Molybdenum, Development and Properties of Arc-Cast Molybdenum Alloys, Powder-Metallurgy Molybdenum-Base Alloys; Session IV -- Molybdenum Alloys for Gas Turbine Applications - Design Considerations and Engine Testing of Molybdenum for Aviation Gas Turbines, The Protection of Molybdenum Against High-Temperature Oxidation, Forging of Molybdenum-Alloy Turbine Buckets, Investigation of the Effects of Hot-Cold Work on the Properties of Molybdenum Alloys.
Author: Armour Research Foundation (U.S.) Publisher: ISBN: Category : Metallurgy Languages : en Pages : 52
Book Description
An envelope-type microstructure produced by liquid-phase sintering techniques has been used to develop ductile molybdenum-base alloys for sodium-cooled fast reactor application.
Author: M. Semchyshen
Author: M. Semchyshen
Author: M. Semchyshen
Author: 
Author: J. A. Houck
Author: North Atlantic Treaty Organization. Advisory Group for Aeronautical Research and Development
Author: 
Author: J. L. Ratliff
Author: OFFICE OF NAVAL RESEARCH ARLINGTON VA.
Author: Armour Research Foundation (U.S.)
Author: Armour Research Foundation (U.S.)