The Activation Energies for Creep of Zircaloy-2 PDF Download
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Author: J. J. Holmes
Publisher:
ISBN:
Category : Metallurgy
Languages : en
Pages : 56
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Book Description
Author: J. J. Holmes
Publisher:
ISBN:
Category : Metallurgy
Languages : en
Pages : 56
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Book Description
Author: W. D. McMullen
Publisher:
ISBN:
Category : Zirconium alloys
Languages : en
Pages : 28
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Book Description
Author: D. G. Franklin
Publisher: ASTM International
ISBN: 9780803102590
Category : Science
Languages : en
Pages : 322
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Book Description
Author: J. J. Holmes
Publisher:
ISBN:
Category : Metals
Languages : en
Pages : 10
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Book Description
The creep properties of 20 per cent cold-worked Zircaloy-2 during neutron irradiation have been determined in the temperature range 275 to 465 C and stress range 20,000 to 35,000 psi. In general, the effects of neutron irradiation on creep are small; however, some differences between in-reactor and ex-reactor tests exist. The activation energy for creep during irradiation is around 90,000 cal/mole. In the absence of irradiation, the activation energy is about equal to the self-difiusion value of 60,000 cal/mole. During reactor outages, a small increase in creep rate occurs. The time required to initiate the increase after a shutdown decreases with increasing temperature.
Author: D. H. Stone
Publisher:
ISBN:
Category : Stainless steel
Languages : en
Pages : 30
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Book Description
Author: Glenn E. Lucas
Publisher: Dissertations-G
ISBN:
Category : Technology & Engineering
Languages : en
Pages : 394
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Book Description
Author: Committee B-10 Staff
Publisher: ASTM International
ISBN:
Category : Uranium
Languages : en
Pages : 393
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Book Description
Author:
Publisher:
ISBN:
Category : Nuclear fuels
Languages : en
Pages : 536
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Book Description
Author: A. L. Bement
Publisher:
ISBN:
Category : Creep
Languages : en
Pages : 16
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Book Description
Uniaxial tension creep tests have been conducted on polycrystalline alpha zirconium from 50 to 850 C to evaluate the stress and temperature dependence of the second-stage creep rate. Five domains of creep behavior were observed over this temperature range. From 50 to 300 C the activation energy for creep was stress-dependent increasing from approximately 30 to 75 kcal/mole when the stress was decreased from 800 to 400 kg/cm2. Between 300 and 400 C, the activation energy is approximately 70 kcal/mole. From 400 to 500 C, the activation energy increased from 70 to 105 kcal/mole with decreasing stress. From 500 to 700 C, the activation energy was lower with an average value of 66 kcal/mole, which was independent of stress and temperature. From 700 to 800 C, the activation energy was 100 kcal/mole independent of stress. The apparent activation energy decreased to a very low value above 800 C. This apparent decrease in the activation energy is caused by a structural instability which may be related to the alpha-to-beta phase transformation. The creep behavior of alpha zirconium was somewhat different, depending upon whether the specimen was obtained from material fabricated and heat treated in the alpha phase or the beta phase. The various mechanisms controlling the creep behavior in these domains are discussed. The high-temperature activation energies of 100 and 66 kcal/mole are similar to those observed in other hexagonal close-packed (hcp) metals when compared on a homologous temperature basis. The low-temperature creep behavior is analogous in some respects to creep in zirconium-base alloys Zircaloy-2 and 2.5 Nb zirconium which are used for pressure tubes and fuel cladding in water-cooled nuclear reactors.
Author: David Fisher
Publisher: Materials Research Forum LLC
ISBN: 1644901684
Category : Technology & Engineering
Languages : en
Pages : 130
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Book Description
Deformation-mechanism maps represent an invaluable guide to predicting the optimum processing conditions for a material. They are also useful in matching a material to a given engineering application. The present book summarizes recent research results in the field. The book references 106 original resources and includes their direct web link for in-depth reading. Keywords: Deformation-Mechanism Maps, Metals, Engineering Applications, Dislocation Glide, Diffusional Flow, Dislocation Creep, Plastic Flow, Strain Rate, Atomic Bonding, Aluminium, Cadmium, Cobalt, Copper, Iron, Lead, Magnesium, Nickel, Potassium, Silver, Tin, Thallium, Titanium, Tungsten, Zinc, Zirconium.
