Corrosion Resistant Uranium Alloys
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Corrosion Resistant Uranium Alloys
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Author : R. K. McGeary
language : en
Publisher:
Release Date : 1953
Corrosion Resistant Uranium Alloys written by R. K. McGeary and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1953 with Uranium alloys categories.
Development And Properties Of Uranium Base Alloys Corrosion Resistant In High Temperature Water
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Author : Melvin L. Bleiberg
language : en
Publisher:
Release Date : 1957
Development And Properties Of Uranium Base Alloys Corrosion Resistant In High Temperature Water written by Melvin L. Bleiberg and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1957 with Uranium alloys categories.
The effects of pile irradiations on the physical properties and corrosion resistance of U-- Mo, U-- Nb; and U--Si alloys are reported. The dimensional stability under irradiation of the gamma phase U-- Mo and U-- Nb alloys is excellent; however, an isotropic volume increase of 4 to 6% per wt.% burnup may limit the ultimate fuel element life. Corrosion resistance of the gamma-phase alloys appesrs to be improved when subjected to s neutron field; this is attributed to an irrsdiation induced stabilization of the gamma phases. The U/ sub 3/Si alloy, on the other hand, suffered severe deterioration, particularly of corrosion resistance. Changes in electrical resistivity, hardness, mechanical properties, and crystal structure are presented and the mechanisms producing the observed changes discussed.
Development And Properties Of Uranium Base Alloys Corrosion Resistant In High Temperature Water
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Author : I. Cohen
language : en
Publisher:
Release Date : 1955
Development And Properties Of Uranium Base Alloys Corrosion Resistant In High Temperature Water written by I. Cohen and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1955 with Uranium alloys categories.
The effects of pile irradiations on the physical properties and corrosion resistance of U-- Mo, U-- Nb; and U--Si alloys are reported. The dimensional stability under irradiation of the gamma phase U-- Mo and U-- Nb alloys is excellent; however, an isotropic volume increase of 4 to 6% per wt.% burnup may limit the ultimate fuel element life. Corrosion resistance of the gamma-phase alloys appesrs to be improved when subjected to s neutron field; this is attributed to an irrsdiation induced stabilization of the gamma phases. The U/ sub 3/Si alloy, on the other hand, suffered severe deterioration, particularly of corrosion resistance. Changes in electrical resistivity, hardness, mechanical properties, and crystal structure are presented and the mechanisms producing the observed changes discussed.
Corrosion Of Uranium Alloys In High Temperature Water
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Author :
language : en
Publisher:
Release Date : 1953
Corrosion Of Uranium Alloys In High Temperature Water written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1953 with categories.
In the search for a corrosion-resistant high-uraniumcontent alloy for use as core material in high-temperature-water-moderated reactors, the corrosion of binary and ternary U alloys was studied in water at 500 and 600 deg F. Alloys contaiiifng less than 40 wt, % Zr additions completely oxidized upon short exposure at 600 deg F, whereas 50 plus wt.% alloys exhibited relatively low corrosion rates. Alloys were sensitive to heat treatment and were most resistant in the quenched condition. The corrosion rates of Zr alloys were linear to slightly accelerated with respect to time. Alloys containing 40, 50, and 60 wt.% Zr were resistant to water at 500 deg F. Molybdenum additions (arc-melted alloys) in the range of 10 to 15 wt.% improved the resistance of U to 600 deg F water but did not result in corrosion-resistant alloys, probably because of inhomogeneity of the alloys studied. The addition of Mo, Nb, Th, Sn, and Ti to uranium--20 wt.% zirconium resulted in several promising alloys: uranium--20 zirconium--5 molybdenum and uranium--20 zirconium-10 niobium. Additions of up to 5 wt, % Mo did not improve the resistance of 40 and 50% Zr alloys to 600 deg F water. A uranium--30 zirconium--5.6 tantalum alloy also exhibited promising resistance to 600 deg F water. Other additions (2 and 5 at.%) which did not improve the resistance of uranium--30 wt.% zirconium were: Sb, Bi, Cc, Cr, Co, Fe, Pb, Ni, Nb, Si, Th, Ti, and W. (auth).
Development And Properties Of Uranium Base Alloys Corrosion Resistant In High Temperature Water Part Iii Corrosion Mechanism Of Uranium Base Alloys In High Temperature Water
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Author :
language : en
Publisher:
Release Date : 1956
Development And Properties Of Uranium Base Alloys Corrosion Resistant In High Temperature Water Part Iii Corrosion Mechanism Of Uranium Base Alloys In High Temperature Water written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1956 with categories.
The factors affecting corrosion resistance both of bare and of clad uranium-base alloys are reviewed and a mechanism proposed for their corrosion behavior. For unclad gamma-phase uranium alloys exposed to a high temperature water corrodent, it is proposed that the corrosion rate is determined primarily by the oxidation of the alloy by water. This behavior is contrary to that of alpha uranium in which the corrosion rate is primarily determined by the formation and subsequent oxidation of a nonadherent hydride layer. In gamma- phase alloys the hydrogen released by the corrosion reaction, rather than forming the thermodynamically stable UH3 phase, dissolves (at least in part) in the base metal where it precipitates as a metastable hydride. The amount of hydrogen absorbed by the metal and hence precipitating as the metastable hydride may be markedly reduced by the addition of hydrogen depolarizers such as nickel or platinum to the water or to the metal. Similarly the amount of absorbed hydrogen may be reduced by introducing sinks that preferentially absorb hydrogen. Both alpha uranium and zirconium were shown to be suitable sinks. Precipitated hydride hardens and embrittles the matrix and by its preferential corrosion eventually leads to discontinuous failure. The hydride may be made to precipitate in a less harmful manner by heat treatments which precipitate nucleating and hardening impurities. The mode of the precipitation is shown to be sensitive to stress; in fact, the assumption of elastic stress as contributing to hydride precipitation is considered necessary to explain the distribution of the precipitate during corrosion. In order to apply a gammaphase fuel alloy as a fuel element material, it is necessary primarily to reduce the amount of hydrogen absorbed by the fuel. This can be done by cladding the fuel with a zirconium- base alloy. Under such conditions it has been shown that fuel element lives in excess of 4 years should be obtainable with properly fabricated fuel elements before they are subject to corrosion failure. Optimum fuel element corrosion life can be achieved by decreasing the general corrosion rate, increasing the hydrogen solubility, increasing the hydrogen diffusion rate, and maintaining a proper clad-fuel bond. For uranium-base alloys such as U3Si that do not form a hydride during hot water corrosion, use of a Zircaloy clad is unnecessary. Therefore, the development of alternate cladding materials such as Al for corrosion resistant fuel elements is predicted upon the development of uranium- base alloys that do not corrode by a hydride mechanism. In addition to U3 both Zr-U alloys and the strained alpha uranium-base alloys do not appear to corrode by a hydride mechanism. (auth).
The High Temperature Aqueous Corrosion Of Uranium Alloys Containing Minor Amounts Of Niobium And Zirconium
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Author : J. E. Draley
language : en
Publisher:
Release Date : 1957
The High Temperature Aqueous Corrosion Of Uranium Alloys Containing Minor Amounts Of Niobium And Zirconium written by J. E. Draley and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1957 with Alloys categories.
Alloys of uranium with niobium show good corrosion resistance in degassed, distilled water to about 315 degrees C. The alloys must be quenched from the gamma phase in order to have high temperature corrosion resistance. The corrosion resistance is destroyed by over-aging at temperatures as low as 350 degrees C. Of those tried, the alloy with best resistance to thermal aging is the uranium-5% zirconium-1.5% niobium alloy. At 290 degrees C, optimum heat treatment can result in a rate of corrosion of about 6 mg/cm sq/day. Certain moderate aging treatments, e.g., 400 degree C for two hours, result in improved corrosion resistance in the initial stages of corrosion. Alloys containing 3% niobium and small amounts of tin show promise. In addition to aging, the alloys are also sensitive to hydrogen content. Ultimate corrosion failure is believed due to absorption of corrosion product hydrodgen.
Resume Of Uranium Alloy Data
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Author : E. F. Losco
language : en
Publisher:
Release Date : 1955
Resume Of Uranium Alloy Data written by E. F. Losco and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1955 with Uranium alloys categories.
Development And Properties Of Uranium Base Alloys Corrosion Resistant In High Temperature Water Part Iv Radiation Stability Of Uranium Base Alloys
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Author :
language : en
Publisher:
Release Date : 1957
Development And Properties Of Uranium Base Alloys Corrosion Resistant In High Temperature Water Part Iv Radiation Stability Of Uranium Base Alloys written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1957 with categories.
The effects of pile irradiations on the physical properties and corrosion resistance of U-- Mo, U-- Nb; and U--Si alloys are reported. The dimensional stability under irradiation of the gamma phase U-- Mo and U-- Nb alloys is excellent; however, an isotropic volume increase of 4 to 6% per wt.% burnup may limit the ultimate fuel element life. Corrosion resistance of the gamma-phase alloys appesrs to be improved when subjected to s neutron field; this is attributed to an irrsdiation induced stabilization of the gamma phases. The U/ sub 3/Si alloy, on the other hand, suffered severe deterioration, particularly of corrosion resistance. Changes in electrical resistivity, hardness, mechanical properties, and crystal structure are presented and the mechanisms producing the observed changes discussed. (auth).
Corrosion Evaluation Of Binary Uranium Alloys In Water At 100 C
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Author : Henry A. Saller
language : en
Publisher:
Release Date : 1957
Corrosion Evaluation Of Binary Uranium Alloys In Water At 100 C written by Henry A. Saller and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1957 with Uranium alloys categories.
The Corrosion Properties Of Zirconium Base Fuel Alloys
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Author : Sam Kass
language : en
Publisher:
Release Date : 1956
The Corrosion Properties Of Zirconium Base Fuel Alloys written by Sam Kass and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1956 with Nuclear fuels categories.