Author: W. H. JohnsonPublisher:
ISBN:
Category : Heat resistant alloys
Languages : en
Pages : 42
Book Description
Melting and Casting of the Refractory Metals Molybdenum, Columbium, Tantalum, and Tungsten
Author: W. H. JohnsonPublisher:
ISBN:
Category : Heat resistant alloys
Languages : en
Pages : 42
Book Description
Properties of Coated Refractory Metals
Author: W. A. GibeautPublisher:
ISBN:
Category : Heat resistant alloys
Languages : en
Pages : 104
Book Description
This report summarizes the information generated since the middle of 1961 on the chemical, physical, and mechanical properties of refractory metals that are coated with oxidation-resistant coatings of advanced-experimental or commercial status. It is a supplement to DMIC Report 162, Coatings for the Protection of Refractory Metals from Oxidation, dated November 24, 1961. Recent data on specific silicide- and aluminide- type coatings for columbium, molybdenum, tantalum, and tungsten and their alloys reflect general advances in coating quality and performance, understanding of the behavior of coated systems, and more complete realization of the problems associated with the use of coated hardware.
Structural Considerations in Developing Refractory Metal Alloys
Author: R. I. JaffeePublisher:
ISBN:
Category : Fracture mechanics
Languages : en
Pages : 36
Book Description
Progress made in applying advanced techniques and structural concepts to the problem of strengthening the Group VI-A metals, Cr, Mo, and W, is examined. At low temperatures, T/Tm
The Effect of Fabrication History and Microstructure on the Mechanical Properties of Refractory Metals and Alloys
Author: Albert G. ImgramPublisher:
ISBN:
Category : Heat resistant alloys
Languages : en
Pages : 80
Book Description
This report summarizes the present knowledge concerning the relationship among fabrication history, metallurgical structure, and the mechanical properites of the refractory metals columbium, tantalum, bolybdenum, and tungsten, and their alloys. These are the refractory metals currently reveiveing the most attention for aerospace applications, and are therefore the materials considered in this survey. The report is organized into three main sections, titled ''Fabrication'', ''Microstructure and Alloying'', and ''Interstitial Impurities''. The data presented were selected as those which best illustrate the topics discussed. Descriptions of the metaljurgical principles involved are included. Suggestions for optimizing mechanical properties by controlling metallurgical structure are made where possible. (Author).
The Application of High Pressure in Metal-deformation Processing
Author: F. W. BoulgerPublisher:
ISBN:
Category : Hydrostatic pressure
Languages : en
Pages : 82
Book Description
On October 3, 1963, a symposium was sponsored by the Bureau of Naval Weapons, Metalworking Processes and Equipment Program, on the application of high pressure in metal-deformation processing. Past research has shown that superimposed hydrostatic pressure can significantly increase the ductility at fracture of various materials. These observations have stimulated considerable interest in applying this hydrostatic-pressure effect to metal deformation processing, where it was anticipated that improved ductility and fabricability of brittle materials could be realized. Hydrostatic extrusion and hydrodynamic compressive forging were two such fabrication techniques discussed at the symposium, and preliminary results were found to be encouraging. Another fabrication process that will be investigated in the near future is sheet drawing, where the effect of superimposed pressure improves the ductility to fracture, it was noted that pressure cycling did not improve either the strength or ductility of steels containing various amounts of carbon. In addition to the mechanical-property effects, hydrostatic pressure has been found to affect measurably, numerous metallurgical properties of metals and alloys. (Author).
NASA Technical Note
Author: The Effect of Molten Alkali Metals on Containment Metals and Alloys at High Temperatures
Author: M. F. AmateauPublisher:
ISBN:
Category : Alkali metals
Languages : en
Pages : 68
Book Description
Corrosion of containment materials is the most serious problem in liquid-metal systems. Most high-temperature engineering metals such as refractory metals, nickel-base and cobalt-base superalloys, and the austenitic and ferritic stainless steels are sufficiently resistant to liquid sodium and NaK to be useful up to about 1600 F. The most important factor in the corrosion of these materials under given conditions of temperature and flow rate is the oxygen content of the sodium. No material is truly corrosion resistant to lithium, although the refractory metals tantalum, columbium, and molybdenum do have some potential for high-temperature service in engineering applications. Zirconium and pure iron may also find some limited use in lithium, especially in lower temperature, twocomponent, static systems. The cobalt- and nickel-base alloys are unsuitable for high-temperature service in liquid lithium. The nitrogen content of the lithium is a particularly important factor. Potassium, rubidium, and cesium are somewhat less corrosive than the other alkali metals. The refractory metals and alloys are little affected by these liquid metals. The sliding and bearing properties of metals are generally affected adversely by the presence of pure molten metals. (Author).
Thermal Radiative Properties of Selected Materials
Author: W. D. WoodPublisher:
ISBN:
Category : Materials
Languages : en
Pages : 290
Book Description
Index to DMIC Reports and Memoranda
Author: Battelle Memorial Institute. Defense Metals Information CenterPublisher:
ISBN:
Category : Alloys
Languages : en
Pages : 38
Book Description
Explosive Forming of Metals
Author: D. E. StroheckerPublisher:
ISBN:
Category : Explosive forming
Languages : en
Pages : 72
Book Description