2 edition of Effects of hydrogen on the high-temperature flow and fracture characteristics of metals. found in the catalog.
Effects of hydrogen on the high-temperature flow and fracture characteristics of metals.
H. E. McCoy
|Contributions||Oak Ridge National Laboratory.|
During operations under hydrogen environment, hydrogen ingresses into the metals and deteriorates their overall mechanical properties (tensile , fracture toughness  . Johnson, in , launched the field of study of hydrogen embrittlement of metals with the publication of his observations of the influence of immersing a piece of iron in different acids on the mechanical properties. He summarized the macroscale effect as: “After a few minutes’ immersion (half a minute will sometimes suffice) in strong hydrochloric or dilute .
The effects of hydrogen on the physical and mechanical properties of iron and steel are reviewed. A new mechanism for the cold work peak for hydrogen in iron is considered. Together, internal friction and mechanical properties indicate that hydrogen softens iron by enhancing screw dislocation mobility at room temperature but hardens iron by core interactions at low . HYDROGEN IN TITANIUM ALLOYS Effect of High Temperature Hydrogen on Titanium Base Alloys (Keynote) H. G. Nelson Hydrogen Effects in Titanium (Invited) F. H. Froes, D. Eliezer, and H. G. Nelson Effect of Hydrogen on the Microstructure and Mechanical Properties of the Ti Alloy: TiMo-3Nb-3AlSi D. A. Hardwick and D. G. Ulmer.
In this study of hydrogen effects on % pure aluminum, hydrogen was introduced by a corrosion process. Two corrosive media were used; deionized pure water was used for dynamic hydrogen charging during mechanical tests and an alkaline solution for hydrogen precharging. Hydrogen was found to change the response of the material to plastic deformation causing . Hydrogen damage is the generic name given to a large number of metal degradation processes due to interaction with hydrogen.. Hydrogen is present practically everywhere, several kilometres above the earth and inside the earth. Engineering materials are exposed to hydrogen and they may interact with it resulting in various kinds of structural damage.
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Effects of hydrogen on the high-temperature flow and fracture characteristics of metals Showing of pages in this report. PDF Version Also Available for by: 3. High pressure and temperature effects of hydrogen gas on superalloy properties such as tensile ductility, fracture, low cycle and high cycle fatigue, cyclic crack growth rate, and creep stress rupture have been analyzed with respect to the.
Hydrogen transport properties • permeability, diffusivity and solubility 3. Mechanical properties in gaseous hydrogen 1) Strength properties 2) Fracture properties 3) Fatigue properties 4. Microstructure and Fabrication (including properties of welds) 5.
References 6. Figures and tables of data. Effects of hydrogen on the fracture toughness of a X70 pipeline steel were investigated in the cases of hydrogen pre-charging and dynamic hydrogen. We present an approach to quantify the effect of hydrogen on the fracture strength and toughness of a low alloy martensitic steel through the use.
Since hydrogen is known to alter the mechanical properties of materials, data are needed to guide the selection of materials for structural components. The objective of this study is to characterize the role of yield strength, microstructural orientation, and small concentrations of ferrite on hydrogen-assisted fracture in two austenitic.
Proceedings of the Fifth International Conference on the Effect of Hydrogen on the Behavior of Materials sponsored by the Structural Materials Division (SMD) Mechanical Metallurgy and Corrosion & Environmental Effects Committees of The Minerals, Metals & Materials Society held at Jackson Lake Lodge, Moran, Wyoming, September The effect of high-temperature water and hydrogen on the fracture behaviour of a low-alloy RPV steel with two different microstructures - bainitic base metal (BM) and simulated coarse grain heat-affected zone (CGHAZ) of welds, was evaluated in this investigation.
Tensile properties were characterized in air. McCoy, H. J., Jr, Effect of hydrogen on the high-temperature flow and fracture characteristics of metals. Special report ORNL, Oak Ridge National Laboratory, Tennessee, Frequently Asked Questions. High temperature hydrogen attack (HTHA), also called hot hydrogen attack, is a problem which concerns steels operating at elevated temperatures (typically above °C) in hydrogen environments, in refinery, petrochemical and other chemical facilities and, possibly, high pressure steam boilers.
The investigated material is a quenched&tempered steel for hydrogen applications. Understanding of hydrogen embrittlement and its effect on the mechanical characteristics of steel becomes fundamental. The complex effect of hydrogen on both the flow stress and the strain hardening rate was found to be dependent on the growing direction of whiskers, their side face indices and the amount of strain.
The hydrogen charged whiskers exhibited larger elongation and more straight and homogeneously distributed slip traces than hydrogen free ones. Diamond is the allotrope of carbon in which the carbon atoms are arranged in the specific type of cubic lattice called diamond cubic.
Diamond is an optically anisotropic crystal that is transparent to opaque. Diamond is the hardest naturally occurring material known. Yet, due to important structural weaknesses, diamond's toughness is only fair to good. The precise tensile strength.
Fujita, F.E.: Theory of hydrogen induced delayed fracture of steels. In: 2nd International Congress on Hydrogen in Metals, Paper 2B10, Paris () Google Scholar Hydrogen-induced cracking (HIC) is most commonly encountered in steels but other metals are susceptible, as shown in Table The presence of hydrogen atoms in a metal degrades some of its mechanical properties, especially its ductility, leading in some cases to embrittlement.
Additionally, hydrogen atoms diffuse through metals and coalesce to form hydrogen. Abstract. The deleterious effects of hydrogen on the mechanical properties of metals are well known and have been extensively studied .
Despite the effort which has been placed on understanding these problems our mechanistic understanding is rudimentary at best. The paper studies the effect of electrolytic hydrogen charging on the plastic flow, strength properties, ductility, and fracture mechanisms in austenitic.
Of particular concern is the effect on fracture toughness, with any effects of hydrogen being universally adverse. Data published by Graville et al (1) on the effect of hydrogen on notch tensile strength (assumed to be somewhat similar to effect on fracture toughness) in provide a useful summary of the generally observed effects.
Early Works on the Passage of Hydrogen Through Metals The Possible Mechanism of Hydrogen Flow Through Metals Fick's Law and its Applicability to the Flow of Hydrogen Through Metals The Effect of Thickness of the Metal Wall Upon the Hydrogen Flow The Effect of Pressure The Effect of Temperature specimens .
Effects of hydrogen on the flow stress of type stainless steel are discussed in detail in Refs. [14, 16]. Low temperature has been shown to have a significant effect on the hydrogen-assisted fracture of type stainless steel. Smooth bar tensile properties of at several temperatures between.
The effect of hydrogen is greatest at the crack tip where either hydrogen entry is facilitated by slip processes or the local hydrogen con- centration is increased by the effect of stress on the chemical potential of the solute H.
Hydrogen locally softens the material in front of the crack, allowing ductile fracture to occur there, prior to.effects of hydrogen on the high-temperature flow and fracture characteristics of metals By H.E. Jr. McCoy No static citation data No static citation data Cite.High pressure high temperature (HPHT) pipelines have specific metallurgy, coating, and design issues.
Metallurgy selection needs to consider high strength materials to limit wall thickness whilst taking into account material de-rating and suitable high temperature coatings.