Mechanical Properties and Recrystallization Behavior of Electron-beam-melted Tungsten Compared with Arc-melted Tungsten - read free eBook in online reader or directly download on the web page. Select files or add your book in reader. Download and read online ebook Mechanical Properties and Recrystallization Behavior of Electron-beam-melted Tungsten Compared with Arc-melted Tungsten write by William D. Klopp. This book was released on 1966. Mechanical Properties and Recrystallization Behavior of Electron-beam-melted Tungsten Compared with Arc-melted Tungsten available in PDF, EPUB and Kindle. 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,
Mechanical Properties and Recrystallization Behavior of Electron-beam-melted Tungsten Compared with Arc-melted Tungsten
Mechanical Properties and Recrystallization Behavior of Electron-beam-melted Tungsten Compared with Arc-melted Tungsten - read free eBook in online reader or directly download on the web page. Select files or add your book in reader. Download and read online ebook Mechanical Properties and Recrystallization Behavior of Electron-beam-melted Tungsten Compared with Arc-melted Tungsten write by William D. Klopp. This book was released on 1966. Mechanical Properties and Recrystallization Behavior of Electron-beam-melted Tungsten Compared with Arc-melted Tungsten available in PDF, EPUB and Kindle.
NASA Technical Note
NASA Technical Note - read free eBook in online reader or directly download on the web page. Select files or add your book in reader. Download and read online ebook NASA Technical Note write by . This book was released on 1966. NASA Technical Note available in PDF, EPUB and Kindle.
Effect of Alloying on Grain Refinement of Electron-beam-melted Tungsten
Effect of Alloying on Grain Refinement of Electron-beam-melted Tungsten - read free eBook in online reader or directly download on the web page. Select files or add your book in reader. Download and read online ebook Effect of Alloying on Grain Refinement of Electron-beam-melted Tungsten write by Walter R. Witzke. This book was released on 1966. Effect of Alloying on Grain Refinement of Electron-beam-melted Tungsten available in PDF, EPUB and Kindle. 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.
Effects of Purity and Structure on Recrystallization, Grain Growth, Ductility, Tensile, and Creep Properties of Arc-melted Tungsten
Effects of Purity and Structure on Recrystallization, Grain Growth, Ductility, Tensile, and Creep Properties of Arc-melted Tungsten - read free eBook in online reader or directly download on the web page. Select files or add your book in reader. Download and read online ebook Effects of Purity and Structure on Recrystallization, Grain Growth, Ductility, Tensile, and Creep Properties of Arc-melted Tungsten write by William D. Klopp. This book was released on 1964. Effects of Purity and Structure on Recrystallization, Grain Growth, Ductility, Tensile, and Creep Properties of Arc-melted Tungsten available in PDF, EPUB and Kindle.
