Mechanical Properties Of Arc Melted And Electron Beam Melted Tungsten Base Alloys
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Mechanical Properties Of Arc Melted And Electron Beam Melted Tungsten Base Alloys
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Author : Peter L. Raffo
language : en
Publisher:
Release Date : 1965
Mechanical Properties Of Arc Melted And Electron Beam Melted Tungsten Base Alloys written by Peter L. Raffo and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1965 with Heat resistant alloys categories.
Mechanical Properties And Recrystallization Behavior Of Electron Beam Melted Tungsten Compared With Arc Melted Tungsten
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Author : William D. Klopp
language : en
Publisher:
Release Date : 1966
Mechanical Properties And Recrystallization Behavior Of Electron Beam Melted Tungsten Compared With Arc Melted Tungsten written by William D. Klopp and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1966 with Liquid metals categories.
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 Of Dilute Tungsten Rhenium Alloys
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Author : William D. Klopp
language : en
Publisher:
Release Date : 1966
Mechanical Properties Of Dilute Tungsten Rhenium Alloys written by William D. Klopp and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1966 with Rhenium alloys categories.
Nasa Technical Note
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Author :
language : en
Publisher:
Release Date : 1973
Nasa Technical Note written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1973 with categories.
Mechanical Properties Of Solid Solution And Carbide Strengthened Arc Melted Tungsten Alloys
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Author : Peter L. Raffo
language : en
Publisher:
Release Date : 1966
Mechanical Properties Of Solid Solution And Carbide Strengthened Arc Melted Tungsten Alloys written by Peter L. Raffo and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1966 with Alloys categories.
Effect Of Alloying On Grain Refinement Of Electron Beam Melted Tungsten
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Author : Walter R. Witzke
language : en
Publisher:
Release Date : 1966
Effect Of Alloying On Grain Refinement Of Electron Beam Melted Tungsten written by Walter R. Witzke and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1966 with Electron beam furnaces categories.
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.
Preliminary Investigation Of Melting Extruding And Mechanical Properties Of Electron Beam Melted Tungsten
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Author : Walter R. Witzke
language : en
Publisher:
Release Date : 1963
Preliminary Investigation Of Melting Extruding And Mechanical Properties Of Electron Beam Melted Tungsten written by Walter R. Witzke and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1963 with Electron beam furnaces categories.
Melting And Casting Of The Refractory Metals Molybdenum Columbium Tantalum And Tungsten
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Author : W. H. Johnson
language : en
Publisher:
Release Date : 1960
Melting And Casting Of The Refractory Metals Molybdenum Columbium Tantalum And Tungsten written by W. H. Johnson and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1960 with Heat resistant alloys categories.
Refractory Metal Alloys Metallurgy And Technology
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Author : I. Machlin
language : en
Publisher: Springer Science & Business Media
Release Date : 2012-12-06
Refractory Metal Alloys Metallurgy And Technology written by I. Machlin and has been published by Springer Science & Business Media this book supported file pdf, txt, epub, kindle and other format this book has been release on 2012-12-06 with Technology & Engineering categories.
This publication documents Proceedings of the Symposium on Metal lurgy and Technology of Refractory Metal Alloys, held in Washington, D.C. at the Washington Hilton Hotel on April 25-26, 1968, under sponsorship of the Refractory Metals Committee, Institute of Metals Division, of the Metallurgical Society of AIME, and the National Aeronautics and Space Administration. The Symposium presented critical reviews of selected topics in refractory metal alloys, thereby contributing to an in-depth understanding of the state-of-the-art, and establishing a base line for further research, development, and application. This Symposium is fifth in a series of conferences on refractory metals, sponsored by the Metallurgical Society of AlME. Publications issuing from the conferences are valuable technical and historical source books, tracing the evolution of refractory metals from early laboratory alloying studies to their present status as useful engineering materials. Refractory metals are arbitrarily defined by melting point. A 0 melting temperature of over 3500 F was selected as the minimum for this Symposium, thus excluding chromium and vanadium, which logically could be treated with other refractory metals in Groups VA and VIA of the periodic table. The Refractory Metals Committee is planning reviews of chromium and vanadium in subsequent conferences.
Nasa Scientific And Technical Reports
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Author : United States. National Aeronautics and Space Administration Scientific and Technical Information Division
language : en
Publisher:
Release Date : 1967
Nasa Scientific And Technical Reports written by United States. National Aeronautics and Space Administration Scientific and Technical Information Division and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1967 with Aeronautics categories.