Download or read book Preliminary Investigation of Melting Extruding and Mechanical Properties of Electron beam melted Tungsten written by Walter R. Witzke and published by . This book was released on 1963 with total page 50 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book NASA Technical Note written by and published by . This book was released on 1971 with total page 568 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Mechanical Properties and Recrystallization Behavior of Electron beam melted Tungsten Compared with Arc melted Tungsten written by William D. Klopp and published by . This book was released on 1966 with total page 42 pages. Available in PDF, EPUB and Kindle. Book excerpt: A study has been conducted of the properties of tungsten fabricated from three ingots consolidated by electron-beam melting. The study included purity as a function of number of melts, recrystallization a d grain growth behavior, low-temperature ductility, and high-temperature tensile and creep strength. The level of most metallic impurities in tungsten decreased with increasing number of electron-beam melts, the reduction being greatest for aluminum, iron, nickel, and silicon. The levels of interstitial impurities generally were not affected by remelting. Resistivity ratios for single crystals machined from ingot slices tended to increase on remelting. The recrystallization rates for worked, electron-beam- melted (EB-melted) tungsten were significantly higher than those observed earlier for arc-melted tungsten. The grain growth rates of EB-melted tungsten were higher than those reported previously for arc-melted tungsten, further reflecting the higher purity of the EB-melted materials. The activation energies for both recrystallization and grain growth in EB-melted tungsten were consistent with expected values assuming grain boundary self-diffusion to be the rate-controlling reaction. The ductile-brittle bend transition temperature for EB-melted tungsten is slightly higher in the worked condition than that reported for arc-melted tungsten. In the recrystallized conditions, the transition temperatures for EB- and arc-melted tungsten are similar. The tensile strength of EB-melted tungsten at 2500 to 4000 F is less than that of arc-melted tungsten. This is partly associated with the large grain size of EB-melted tungsten. However, when compared at the same grain size,

Download or read book Mechanical Properties of Arc melted and Electron beam melted Tungsten base Alloys written by Peter L. Raffo and published by . This book was released on 1965 with total page 32 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Applied Mechanics Reviews written by and published by . This book was released on 1963 with total page 1196 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Mechanical Properties and Recrystallization Behavior of Electron beam melted Tungsten Compared with Arc melted Tungsten written by William D. Klopp and published by . This book was released on 1966 with total page 34 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Monthly Catalog of United States Government Publications written by United States. Superintendent of Documents and published by . This book was released on 1963 with total page 1304 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Index Aeronauticus written by and published by . This book was released on 1963 with total page 848 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Initial Investigation of Arc Melting and Extrusionof Tungsten written by Fred A. Foyle and published by . This book was released on 1960 with total page 40 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Tungsten Research and Development Review written by J. L. Ratliff and published by . This book was released on 1963 with total page 70 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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.

Download or read book Keywords Index to U S Government Technical Reports permuted Title Index written by United States. Department of Commerce. Office of Technical Services and published by . This book was released on 1963 with total page 618 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Metal Progress written by and published by . This book was released on 1964 with total page 924 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Effect of Alloying on Grain Refinement of Electron beam melted Tungsten written by Walter R. Witzke and published by . This book was released on 1966 with total page 28 pages. Available in PDF, EPUB and Kindle. Book excerpt: Ingot structures resulting from electron-beam melting of tungsten consist mainly of columnar grains extending the length of the ingot. In order to examine the grain refining capabilities of various elemental and refractory compound additions, small ingots of tungsten containing these additions were prepared by electron-beam melting. Measurements on transverse ingot sections from each melt indicated that all the additions decreased the average grain diameter of the columnar grains typical of electron-beam melted tungsten and that grain refining effectiveness varied with the concentration of the solute S. Losses of the additions during melting were in excess of 90 percent in many cases. The most potent grain refiner was boron. A nominal addition of 0. 5 weight percent decreased the average grain diameter of the columnar grains from 0. 48 to 0. 008 centimeter. The effectiveness of the elemental additions decreased in the following order: boron, yttrium, carbon, hafnium, zirconium, molybdenum, columbium, rhenium, and tantalum. The losses of these elements during melting also decreased in approximately the same order. The elemental additions were generally more effective grain refiners than the refractory compounds. The elements with the smallest distribution coefficients were the most effective grain refiners.

Download or read book Keywords Index to U S Government Technical Reports written by and published by . This book was released on 1963-08 with total page 108 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Monthly Catalog of United States Government Publications Cumulative Index written by United States. Superintendent of Documents and published by . This book was released on 1980 with total page 1284 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book A Study of NACA and NASA Published Information of Pertinence in the Design of Light Aircraft Structures by Frederick O Smetana written by Frederick O. Smetana and published by . This book was released on 1970 with total page 444 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book U S Government Research Reports written by and published by . This book was released on 1963 with total page 162 pages. Available in PDF, EPUB and Kindle. Book excerpt: