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Tuesday, April 21, 2020 | History

3 edition of Effect of hydrogen exposure on a Cu-8 Cr-4 Nb alloy found in the catalog.

Effect of hydrogen exposure on a Cu-8 Cr-4 Nb alloy

David L. Ellis

Effect of hydrogen exposure on a Cu-8 Cr-4 Nb alloy

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  • 14 Currently reading

Published by National Aeronautics and Space Administration, National Technical Information Service, distributor in [Washington, DC, Springfield, Va .
Written in English

    Subjects:
  • Copper alloys.

  • Edition Notes

    StatementDavid L. Ellis, Ajay K. Misra and Robert L. Dreshfield.
    SeriesNASA technical memorandum -- 106429., NASA technical memorandum -- 106429.
    ContributionsMisra, Ajay K., Dreshfield, Robert L., United States. National Aeronautics and Space Administration.
    The Physical Object
    FormatMicroform
    Pagination1 v.
    ID Numbers
    Open LibraryOL14705725M

    In metallurgy, stainless steel, also known as inox steel or inox from French inoxydable (inoxidizable), is a steel alloy, with a minimum of 11% chromium content by mass and a maximum of % carbon by mass.. Stainless steels are most notable for their corrosion resistance, which increases with increasing chromium ons of molybdenum increases corrosion resistance in reducing acids. Association of Metallurgical Engineers of Serbia AMES Scientific paper UDC: MELT QUALITY CONTROL AT ALUMINUM CASTING PLANTS Mile B. Djurdjević1*, Zoran Odanović2, Jelena Pavlović-Krstić3 1Nemak Linz, Zeppelinstra Linz, Austria 2IMS Institute, Bulevar vojvode Mišića 43, Belgrade, Serbia 3Insitute of Manufacturing Technologies and Quality Assurance File Size: KB. product itself. Refer to Sections 2 and 3 for hazards related to specific components of the combined mixture. Exposure to Hydrogen Sulfide is harmful in relatively low concentrations. Severe over-exposure can cause headaches, nausea, collapse and death. Other Effects: The mixture does not contain any class I or Class II ozone depleting chemicals.


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Effect of hydrogen exposure on a Cu-8 Cr-4 Nb alloy by David L. Ellis Download PDF EPUB FB2

Get this from a library. Effect of hydrogen exposure on a Cu-8 Cr-4 Nb alloy. [David L Ellis, (Engineer); Ajay K Misra; Robert L Dreshfield; United States.

National Aeronautics and Space Administration,]. Effect of hydrogen exposure on a Cu-8 Cr-4 Nb alloy (OCoLC) Material Type: Government publication, National government publication: Document Type: Book: All Authors / Contributors: David L Ellis, (Engineer); Ajay K Misra; Robert L Dreshfield; United States.

National Aeronautics and Space Administration. A Cu-8 at. percent Cr-4 at. percent Nb (Cu-8 Cr-4 Nb) alloy has been identified as a promising material for this application. However, hydrogen embrittlement is a concern given the presence of high pressure, high temperature hydrogen in regeneratively cooled rocket motors.

Hydrogen Effects in Materials. Editor(s): Anthony W. Thompson; Part VIII: Hydrogen in Titanium Alloys. Effect of high Temperature Hydrogen on Titanium Base Alloys (Pages: ) Effect of Hydrogen Exposure on a Cu‐8 Cr‐4 Nb Alloy for Rocket Motor Applications (Pages: ).

Zr-Nb alloys are known to perform better in corrosion and hydrogen pick-up than other Zr alloys but the mechanism by which this happens is not well understood. Atomistic simulations using density functional theory of both tetragonal and monoclinic ZrO2.

When hydrogen content increases over at%, ballistic transport behavior occurs. Figure 2 is a representative example for polished (Ni Nb Zr ) 85 H 15 glassy alloy. In cooling run, the resistivity decreases almost linearly down to K and then suddenly reduces by three orders of magnitude at K and falls down again to order of μΩcm at 88 by: 3.

A comparison of the oxidation data on Zirlo with and without prehydriding (performed in gas phase hydrogen and/or in steam) indicated that hydrogen concentration in the range of – wppm had minimal effect on the Zirlo oxidation rate in air at temperatures in the range of –°C. The effect of alloying with – wt % H on the creep of the Ti-6Al-4V alloy at a temperature of ∼T m (T m is the melting temperature) is studied.

The alloys were made from Nb and Fe fine powders supplied by Sigma-Aldrich Co. with a purity of % and %, respectively. To obtain Me-H (metal-hydrogen) system the homogenised alloys were placed in a quartz tube and exposed to hydrogen gas at a pressure up to ~ Pa.

The hydrogen absorption took place during slow cooling. The (Ni Nb ) 45 Zr 50 X 5 (X = Al, Co, Cu, P, Pd, Si, Sn, Ta or Ti) alloy ribbons were produced by the melt-spinning technique.

All ribbon specimens were confirmed to have a single amorphous phase by XRD analysis. The crystallization temperatures of the melt-spun (Ni Nb ) 45 Zr 50 X 5 (X = Al, P, Pd, Si or Sn) amorphous alloys are higher than that of the (Ni Nb ) 50 Zr Cited by: For instance, the tensile strength of Cu-8 Cr-4 Nb alloy is MPa at room temperature and MPa at K, substantially higher than the same properties of NARloy-Z (Cu-3wt.% Agwt.% Zr), the alloy currently used in aerospace applications.

NASA LeRC has developed a Cu-8 at.% Cr-4 at.% Nb (Cu-8 Cr-4 Nb) alloy for these applications. The alloy is designed for use up to °C and shows exceptional strength, low cycle fatigue (LCF) resistance and creep resistance. Cu-8 Cr-4 Nb also has a thermal conductivity of at least 72% that of pure Cu.

The particle-strengthened Cu–8 at.%Cr–4 at.%Nb alloy is processed by consolidation of atomized powders followed by extrusion to obtain bars and rolling to produce sheets. Comparison of copper matrix grain and second-phase particle structures in both extruded and rolled Cu–8Cr–4Nb was performed. Extruded material displayed locally banded arrangements of Cr2Nb particles, while the Cited by: 6.

BARRACLOUGH - EFFECTS OF HYDROGEN ON ALLOY STEEL PRODUCTION TABLE 2 -AVERAGE VALUES FOR THE HYDROGEN CONTENT OF VARIOUS STEELS AT TAPPING WHEN PRODUCED BY VARIOUS STEEL-MAKING PROCESSES QUALITY OF HYDROGEN CONTENT, STEEL ml. per g. r Basic Acid Basic Electric Open- High-Arc Hearth Frequency Process Process.

The Ni−Cr dental casting alloy (% Ni, % Cr, % Mo, % other elements) was used in the present study. The alloy samples were manufactured to a circle sheet of 10 mm in diameter and mm in thickness, divided into 4 groups randomly, and then.

The densification behavior of oxidized Cu-8 at% Cr-4 at%Nb alloy powders by vacuum hot pressing and subsequent mechanical properties of alloy compares well with that of fresh powders with no oxides and hydrogen reduced powders sintered using same by: Cuwt%Ag alloy nanopowders were prepared by induction plasma system, and the effect of hydrogen content in plasma atmosphere on morphology and size distribution of nanopowders was studied.

The results show that with the increase of hydrogen content, the size of the prepared Cuwt%Ag alloy nanopowders is refined from nm to nm and then to nm, however, there is no obvious effect Cited by: 1. The only difference is that the activity of Nb will decrease as the Nb is consumed forming β niobium hydride (Nb H ).

This does provide a self-limiting mechanism to minimize hydrogen embrittlement, but the hydride formed could still present a serious by: 2.

The impact specimens with different hydrogen contents were solution treated at ±3°C for 12h; water quenched at °C; and aged at ±1°C for 6h.

The impact test was carried out at Roell pendulum impact testing machine. The impact test results show that the impact energy has strong relation with the hydrogen content. The total absorption energy increases with the increasing of Cited by: 6.

Effect of hydrogen exposure on a Cu-8 Cr-4 Nb alloy by: Ellis, David L. Published: () Influence of high pressure hydrogen environment on creep deformation of Mo-Re, Haynesand NARloy-S alloys NASA grant no.

NAGannual technical report / Published: (). Susceptibility of aluminium and its alloys towards hydrogen embrittlement has been well established.

Still a lot of confusion exists on the question of transport of hydrogen and its possible role in stress corrosion cracking.

This paper reviews some of the fundamental properties of hydrogen in aluminium and its alloys and its effect on mechanical by: After copper plating, the bake out parameters used were: °C or °C for 4 hours in air.

The hydrogen depth profile in the samples was measured before and after the bake out by glow discharge optical emission spectroscope (GDOES). The results suggest that the hydrogen bake out did not remove the hydrogen from the : Deepak Kumar, Zhiyue Xu, Paul Agosta, Bill Bailey. Electromagnetic evaluation of hydrogen content in Zr %Nb all oy rg 1, 1,2, 1, ann 2, 3 1 National Institute of Research and Development for Technical Physics, Iasi, Romania 2 Joint Institute for Nuclear Research, Dubna, Russia 3 CNEA, Buenos Aires, Argentina Abstract Zr %Nb alloys have wide utilization in nuclear energy engineering, being used.

Effects of thermal and mechanical processing on microstructures and desired properties of particle-strengthened Cu-Cr-Nb alloys by: Anderson, Kenneth Reed. Published: () Effect of hydrogen exposure on a Cu-8 Cr-4 Nb alloy by: Ellis, David L. Published: (). However, hydrogen effects on corrosion processes and mechanisms have not been considered, yet.

In Swedish Nuclear Waste Council State-of-the-art report SOU study of radiation-Induced hydrogen absorption mechanism of copper in the final disposal conditions was recommended.

Electrical resistivity measurements in the temperature range from 6 to K were carried out in order to investigate the effects of the hydrogen absorption on the transport properties of Ni 36 Nb 24 Zr 40 amorphous alloy ribbon. The electrical resistivity basically behaved negative temperature dependence in all prepared specimens of (Ni Nb Zr ) x H x with 0 ≤ x Cited by: 4.

Hydrogen effects in titanium can be divided into two main categories; the effects of internal hydrogen, already present in the material as hydride or in solid solution, and the effects of external hydrogen, produced mainly by the environment and its interaction with the titanium alloy.

coefficient[3], hydrogen permeation of Fe-Cr alloy is apparently decreases with formation of oxide scale. The peaks of Fe 2O3 and Fe 3O4 were detected in the X-ray diffraction pattern in the early stage of oxidation at K.

In addition to this, iron oxides nodules were observed on the surface of alloy in SE. Graphene domains with different sizes and densities were successfully grown on Cu foils with use of a chemical vapor deposition method.

We investigated the effects of volume ratios of argon to hydrogen during the annealing process on graphene growth, especially as a function of hydrogen partial pressure. The mean size and density of graphene domains increased with an increase in hydrogen Cited by: The change of mechanical properties is caused by the material response to hydrogen.

However, the form of exposure or the type of attack directly affects the degradation mechanism in the materials, and results in various, sometimes opposite, effects [2] such as reported on the strain hardening Cited by: 2. The structure of the W/Cu alloy produced in the present work was compared with those for pure copper produced from Cu2O produced by hydrogen reduction under similar conditions.

It indicated that the presence of W hinders the coalescence of Cu particles and the alloy retains its nano-grain structure. The. If you are interested in the effect of cold work, here is a good reference.

If you are bothered by the square-root of pressure driving force, it’s a result of entropy: hydrogen travels in stainless steel as dislocated H atoms and the dissociation H2 –> 2 H leads to the square root. Robert Buxbaum, Decem First-principles based modeling of hydrogen permeation through Pd-Cu alloys Lin Qin and Chao Jiang* State Key Laboratory of Powder Metallurgy, Central South University, Changsha, HunanChina Abstract The solubility and diffusivity of hydrogen in disordered Pd1-xCux alloys are investigated.

effects on hardened steels based on three major objectives: to understand the features of the point defect spectrum in Fe-C alloys, to develop fundamental understanding of the interaction of hydrogen with those defects, and finally to determine the properties of the new hydrogen-induced defects and their effects on the local microstructure.

In CANDU ® reactors, fuel and coolant are contained in horizontal pressure tubes made of Zr wt% Nb alloy. In the past decade, the effect of more than 20 impurity elements, in various concentrations, on oxidation and deuterium pickup (at °C, pD =Li 2 O) have been investigated in over 70 ZrNb alloys.

The studies were performed using non-consumable arc-melted alloy logs that Author: RA Ploc. Precipitation hardenable Al-Zn-Mg alloys are susceptible to hydrogen environment assisted cracking (HEAC) when exposed to aqueous environments.

In Al-Zn-Mg-Cu alloys, overaged tempers are used to increase HEAC resistance at the expense of strength but overaging has little benefit in low copper alloys. However, the mechanism or mechanisms by which overaging imparts HEAC Cited by: 2.

Article Hydrogen Storage Characteristics and Corrosion Behavior of V-rich Ti-V-Cr-Fe Alloy Jimoh Mohammed Abdul 1,2,*, Lesley Hearth Chown 1, Jamiu K. Odusote 3, Jean Nei 4, Kwo-Hsiung Young 4 and Woli Taiye Olayinka 2 1 School of Chemical and Metallurgical Engineering, Faculty of Engineering and Built Environment, University of the Witwatersrand, Johannesburg Private Bag 3, WitsAuthor: Jimoh Mohammed Abdul, Lesley Hearth Chown, Jamiu K.

Odusote, Jean Nei, Kwo-Hsiung Young, Woli Taiye. This invention is directed to a method of preventing oxidation of copper alloys at high temperatures by deposition of a nano-structured, low-chromium copper-chromium protective coating to copper-alloy components.

The coatings of the present invention are applied by an ion beam assisted, electron beam physical vapor deposition and consist of copper and chromium particles having a diameter of Cited by: 5.

A method of forming an environmental resistant thermal barrier coating on a copper alloy is disclosed. The steps include cleansing a surface of a copper alloy, depositing a bond coat on the cleansed surface of the copper alloy, depositing a NiAl top coat on the bond coat and consolidating the bond coat and the NiAl top coat to form the thermal barrier by: Abstract The ductility loss and threshold stress intensity,K_(IH)during hydrogen charging were measured for pure Ni and four Ni-Fe fcc results show that ductility loss in 40Ni60Fe alloy and K_(IH)a 50Ni50Fe alloy have a minimum variations of the amounts of hydride, hydrogen evolution and dislocation structure with composition have been va- riation of.

Based upon examination of alloys with Cr contents ranging from 2 to 1 atomic percent and Nb contents ranging from 1 to 5 atomic percent with a constant Cr:Nb ratio of ^, the best combination of properties and processability appears to be obtained with 8 atomic percent Cr and 4 atomic percent Nb.

This alloy was designated GRCop [email protected]{osti_, title = {Oxidation behavior of V-Cr-Ti alloys in low-partial-pressure oxygen environments}, author = {Natesan, K. and Uz, M.}, abstractNote = {A test program is in progress at Argonne National Laboratory to evaluate the effect of pO{sub 2} in the exposure environment on oxygen uptake, scaling kinetics, and scale microstructure in V-Cr-Ti alloys.

The light alloy is made of a certain combination of the metals titanium (Ti), magnesium (Mg) and nickel (Ni), and it could provide a starting point to a new approach on using hydrogen as fuel.