Author: Publisher:
ISBN:
Category :
Languages : en
Pages :
Book Description
LOW-TEMPERATURE DUCTILITY AND HYDROGEN EMBRITTLEMENT OF URANIUM. A Literature Review
Author: Nuclear Science Abstracts
Author: NASA Technical Note
Author: The Kinetic and Mechanical Aspects of Hydrogen-induced Failure in Metals
Author: Howard G. NelsonPublisher:
ISBN:
Category : Metals
Languages : en
Pages : 148
Book Description
Premature hydrogen-induced failure observed to occur in many metal systems involves three stages of fracture: (1) crack initiation, (2) stable slow crack growth, and (3) unstable rapid crack growth. The presence of hydrogen at some critical location on the metal surface or within the metal lattice was shown to influence one or both of the first two stages of brittle fracture but has a negligible effect on the unstable rapid crack growth stage. The relative influence of the applied parameters of time, temperature, etc., on the propensity of a metal to exhibit hydrogen induced premature failure was investigated.
Scientific and Technical Aerospace Reports
Author: Advances in Corrosion Science and Technology
Author: Mars G. FontanaPublisher: Springer Science & Business Media
ISBN: 1468489860
Category : Science
Languages : en
Pages : 351
Book Description
This series was organized to provide a forum for review papers in the area of corrosion. The aim of these reviews is to bring certain areas of corrosion science and technology into a sharp focus. The volumes of this series are published approximately on a yearly basis and each contains three to five reviews. The articles in each volume are selected in such a way as to be of interest both to the corrosion scientists and the corrosion technologists. There is, in fact, a particular aim in juxtaposing these interests because of the importance of mutual interaction and interdisciplinarity so important in corrosion studies. It is hoped that the corrosiori scientists in this way may stay abreast of the activities in corrosion technology and vice versa. In this series the term "corrosion" is used in its very broadest sense. It includes, therefore, not only the degradation of metals in aqueous en vironment but also what is commonly referred to as "high-temperature oxidation. " Further, the plan is to be even more general than these topics; the series will include all solids and all environments. Today, engineering solids include not only metals but glasses, ionic solids, polymeric solids, and composites of these. Environments of interest must be extended to liquid metals, a wide variety of gases, nonaqueous electrolytes, and other non aqueous liquids.
Effect of Hydrogen on the Tensile Transition in Uranium
Author: L. L. MarshCorrosion Abstracts
Author: Publisher:
ISBN:
Category : Corrosion and anti-corrosives
Languages : en
Pages : 722
Book Description
Hydrogen Decreased Ductility of a U-6%NB Alloy
Author: Publisher:
ISBN:
Category :
Languages : en
Pages : 7
Book Description
Hydrogen decreases the ductility of uranium alloys without resulting in a brittle failure. Due to the low solubility of hydrogen and the propensity to form hydrides in uranium and its alloys, it might be expected that the mechanism of embrittlement would be the stress-induced hydride formation and cleavage mechanism. However at 2-5 wppm levels, hydrogen significantly decreases the ductility of the alloy without resulting in a cleavage-based mechanism. We have chosen the uranium-niobium (6wt.%) alloy system to investigate the hydrogen embrittlement phenomena in uranium-based alloys. The alloy was gas - phase charged at 800 C at pressures ranging from 10−4 to 10−1 MPa using ultra-high purity hydrogen gas (99.999%) followed by water quenching. Hydrogen contents ranged from 0 wppm (vacuum outgassed) to 20 wppm. Tensile tests were performed at strain rates of 10−3 and 10−5 sec−1. The elongation and reduction in area decrease rapidly from 0 wppm to 5 wppm with little further reduction at 20 wppm. Hydrogen has no effect on the yield strength, ultimate tensile strength and work hardening coefficient. Scanning electron microscopy of the fracture surfaces shows that all of the samples fail by ductile microvoid coalescence. Concomitant with the reduction in ductility due to increased hydrogen content, the micro void size also decreases with increasing hydrogen content. This alloy has numerous inclusions and the microvoids all nucleate at the inclusions. At low hydrogen contents, the microvoids appear to nucleate only on the largest inclusions (H"0 [mu]m). As the hydrogen content increases, the microvoids tend to also nucleate on smaller inclusions (
The Hydrogen Embrittlement of Uranium
Author: Geoffrey Thomas NewmanPublisher:
ISBN:
Category :
Languages : en
Pages : 160
Book Description