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Effect Of Oxygen On Mechanical Properties Of Tungsten
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Book Synopsis Effect of Oxygen on Mechanical Properties of Tungsten by : Joseph R. Stephens
Download or read book Effect of Oxygen on Mechanical Properties of Tungsten written by Joseph R. Stephens and published by . This book was released on 1963 with total page 32 pages. Available in PDF, EPUB and Kindle. Book excerpt: The effect of oxygen on the mechanical properties of commercial polycrystalline tungsten and zone-refined single-crystal tungsten was evaluated by means of tensile tests of oxygen-doped specimens in the ductile-to-brittle transition temperature range. The effect of oxygen as a surface oxide that might be encountered in normal working and forming operations was evaluated by means of a three-point loading bend test at room temperature. Oxygen doping of the polycrystalline and single-crystal tensile specimens was accomplished by equilibrating the specimen and tungsten oxide powder in a sealed tungsten capsule at high temperatures. A desired oxygen concentration could be achieved by varying the time of doping in the temperature range of 3000 to 3600 F. Results showed that the commercial recrystallized rods containing 4 parts per million (ppm) oxygen had a ductile-to-brittle transition temperature (based on 50-percent reduction in area) of 4500 F. Increasing the oxygen concentration to 10, 30, and 50 ppm increased the transition temperature to 6600, 840, and 1020 F, respectively. The oxygen additions also produced a progressive lowering of the ultimate tensile strength. The mechanism for the effect of oxygen on the transition temperature and ultimate tensile strength is believed to be that of segregation of the oxygen atoms at the grain boundaries. The oxygen additions also caused a progressive lowering of the yield strength, which is believed to result from the interaction of oxygen with carbon atoms or other impurity atoms present in the tungsten lattice.
Book Synopsis Effect of Oxygen on Mechanical Properties of Tungsten by : Joseph R. Stephens
Download or read book Effect of Oxygen on Mechanical Properties of Tungsten written by Joseph R. Stephens and published by . This book was released on 1963 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Effects of Interstitial Impurities on the Low-temperature Tensile Properties of Tungsten by : Joseph R. Stephens
Download or read book Effects of Interstitial Impurities on the Low-temperature Tensile Properties of Tungsten written by Joseph R. Stephens and published by . This book was released on 1964 with total page 24 pages. Available in PDF, EPUB and Kindle. Book excerpt: A study was undertaken to determine the effects of the interstitial impurities oxygen and carbon on the mechanical properties of polycrystalline tungsten and high-purity tungsten single crystals. Results of tensile tests showed that additions of both oxygen and carbon to polycrystalline tungsten produced a marked increase in the ductile to brittle transition temperature. Oxygen and carbon produced a much smaller increase in the transition temperature of the single-crystal specimens compared with equivalent amounts of impurities in the polycrystalline specimens. Addition of oxygen to polycrystalline tungsten lowered both the ultimate tensile strength and the yield strength, but had no measurable effect on the strength properties of single-crystal specimens. Carbon additions to both polycrystalline and single-crystal specimens did not affect the ultimate tensile strength; however, a large increase in the yield strength resulted. The results suggest that oxygen embrittlement in tungsten is caused by grain-boundary segregation, while carbon embrittlement results from an interaction between carbon atoms and dislocations within the tungsten lattice.
Download or read book NASA Technical Note written by and published by . This book was released on 1963 with total page 612 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis High Temperature Oxidation Protection of Tungsten by :
Download or read book High Temperature Oxidation Protection of Tungsten written by and published by . This book was released on 1969 with total page 140 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Oxidation of Tungsten by : Vincent David Barth
Download or read book Oxidation of Tungsten written by Vincent David Barth and published by . This book was released on 1961 with total page 192 pages. Available in PDF, EPUB and Kindle. Book excerpt: The report presents a detailed review of available information on the oxidation of W and its alloys. W is relatively inert below 700 C. As the temperature is increased above this level, however, oxidation becomes progressively more rapid, reaching catastrophic rates at temperatures around 1200 C and above. Various theories for the mechanism and rates of W oxidation at different temperatures are reviewed, and the effect of pressure and water vapor on the stability of W oxides is discussed in detail. The elevatedtemperature reactions of W with other materials, such as refractory oxides, and with gases other than oxygen also are covered. Information on the protection of W by alloying and coating is included. (Author).
Book Synopsis Activation Sintering of Tungsten and Its Effect on Some Mechanical Properties by : I. J. Toth
Download or read book Activation Sintering of Tungsten and Its Effect on Some Mechanical Properties written by I. J. Toth and published by . This book was released on 1965 with total page 234 pages. Available in PDF, EPUB and Kindle. Book excerpt: The work is concerned with improvements in the sintering properties of Tungsten. Two methods of 'activation sintering' are studied, halogen activation and metallic activation. An example of the first is the use of hydrogen and bromine as sintering atmosphere. No significant increase in densification was noted, except for a moderate improvement at temperatures around 1400C. However, some beneficial effects were observed, notably in the rounded shape of the pores and in lowering the oxygen content. This led to an improvement in mechanical properties. Metallic activation, mainly provided by nickel and palladium salts led to high densities at a sintering temperature of 1100C but was accompanied by increased brittleness. This undesirable feature could be in part offset by controlling the amount of metallic activator and by some suitable subsequent heat-treatment. The two types of processes are discussed seperately, some appropriate mechanisms are proposed to explain the results observed, and the theoretical implications are considered. (Author).
Book Synopsis High Temperature Oxidation Protection of Tungsten by :
Download or read book High Temperature Oxidation Protection of Tungsten written by and published by . This book was released on 1969 with total page 140 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis High Temperature Creep Properties of Tungsten in Vacuum and Oxygen Environments by : Srikanth Rao
Download or read book High Temperature Creep Properties of Tungsten in Vacuum and Oxygen Environments written by Srikanth Rao and published by . This book was released on 1970 with total page 76 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Investigation of the Properties of Tungsten and Its Alloys by : Union Carbide Metals Company. Metals Research Laboratories
Download or read book Investigation of the Properties of Tungsten and Its Alloys written by Union Carbide Metals Company. Metals Research Laboratories and published by . This book was released on 1960 with total page 110 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Survey of the Deformation Characteristics of Tungsten by : George E. Gazza
Download or read book Survey of the Deformation Characteristics of Tungsten written by George E. Gazza and published by . This book was released on 1963 with total page 27 pages. Available in PDF, EPUB and Kindle. Book excerpt: Results of basic investigations have shown that variable purity, microstructure, surface condition, and deformation rate will significantly affect the mechanical properties of tungsten, particularly near the ductile- brittle transition temperature range. From the standpoint of purity, oxygen and/or carbon appear to be particularly detrimental as interstitial contaminants. The effect of trace metallic impurities is unknown but is suspected to produce a significant effect in property variations. Thus far, the inability to correlate a specific impurity effect with a property variation has been due to the incapabilities of present analytical techniques at low impurity levels. Internal friction techniques are not without promise and they are expected to yield informative data on impurity effects in tungsten. The effect of surface condition on the mechanical properties has been already demonstrated. Both electropolishing and oxidation have a beneficial influence.
Download or read book Nuclear Science Abstracts written by and published by . This book was released on 1975 with total page 1166 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Physical Metallurgy of Tungsten and Tungsten Alloys by : Westinghouse Electric Corporation. Westinghouse Lamp Division
Download or read book Physical Metallurgy of Tungsten and Tungsten Alloys written by Westinghouse Electric Corporation. Westinghouse Lamp Division and published by . This book was released on 1960 with total page 524 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis The Effect of Annealing on the Mechanical Properties of Tungsten by : Joseph Goldstein
Download or read book The Effect of Annealing on the Mechanical Properties of Tungsten written by Joseph Goldstein and published by . This book was released on 1960 with total page 62 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Scientific and Technical Aerospace Reports by :
Download or read book Scientific and Technical Aerospace Reports written by and published by . This book was released on 1975 with total page 1010 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Effect of Strain Rate on Mechanical Properties of Wrought Sintered Tungsten at Temperatures Aboue 2500 Degrees F by : Paul F. Sikora
Download or read book Effect of Strain Rate on Mechanical Properties of Wrought Sintered Tungsten at Temperatures Aboue 2500 Degrees F written by Paul F. Sikora and published by . This book was released on 1961 with total page 32 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Effect of Tungsten Composition on the Mechanical Properties of the W-Ni-Fe Heavy Alloy by : Joseph William O'Neil
Download or read book Effect of Tungsten Composition on the Mechanical Properties of the W-Ni-Fe Heavy Alloy written by Joseph William O'Neil and published by . This book was released on 1965 with total page 30 pages. Available in PDF, EPUB and Kindle. Book excerpt:
