Author: Eric K. Hoffman
Publisher:
ISBN:
Category : Iron alloys
Languages : en
Pages : 194

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Author: Raymond L.
Publisher: ASTM International
ISBN:
Category :
Languages : en
Pages : 274

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Author: Patrick J. Moran
Publisher:
ISBN:
Category : Absorption
Languages : en
Pages : 16

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Book Description
The influence of strain and strain rate on hydrogen entry, transport, and trapping in high-strength ferrous alloys and the subsequent effects on hydrogen embrittlement are being investigated in this research program. Most hydrogen permeation measurements reported in the literature presume surface absorption kinetics to be sufficiently fast as to not influence observed changes in the permeation flux. It is interesting that hydrogen recombination poisons (enhancing absorption) are frequently used to observe permeation currents. It is also interesting that environmental slow-strain-rate plastic loading and cyclic loading at low frequency, possibly enhancing either absorption or bulk diffusion of hydrogen, have been observed to increase tendencies towards hydrogen embrittlement. In the present investigation a series of slow-strain-rate measurements, electrochemical measurements to investigate adsorption-absorption kinetics and eventually a combination of these, are being performed and will be described. A discussion of electrochemical techniques being utilized for adsorption-absorption studies is included. It is anticipated that once this program is completed, the influence of plastic deformation on the hydrogen absorption and apparent hydrogen diffusion rate for a high-strength steel will be assessed. Once the effects of surface absorption and bulk diffusion are differentiated, the influence of each will be correlated with the degree of hydrogen-stimulated environmental damage observed for AISI 4340 steel in chloride environments.

Author: A. R. Elsea
Publisher:
ISBN:
Category : Steel
Languages : en
Pages : 42

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This memorandum introduces the problem of delayed, brittle failures associated with hydrogen in steel, particularly high-strength steel. It is intended to help the steel user determine if he has such a problem. The effects of hydrogen on the mechanical properties of steel are dealt with, and the behavior of material susceptible to delayed, brittle failure is described. Also, the effects of such factors as strength level, magnitude of applied stress, hydrogen content, steel composition, test temperature, and strain rate on hydrogen embrittlement and the susceptibility to hydrogen-induced, delayed, brittle failure are discussed. Possible sources of hydrogen in steel and the types of tests useful in determining the susceptibility to delayed failure are outlined. (Author).

Author: Richard A. Oriani
Publisher: William Andrew
ISBN:
Category : Technology & Engineering
Languages : en
Pages : 920

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Author: Louis Raymond
Publisher: ASTM International
ISBN: 0803109598
Category : Metals
Languages : en
Pages : 429

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Author:
Publisher:
ISBN:
Category :
Languages : en
Pages : 37

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An electrochemical test method is proposed for determination of the susceptibility of materials to internal hydrogen embrittlement (IHE). The method is based on the assumption that the relative susceptibility of a material depends both on the specific aqueous environment to which the material is exposed and to the dissimilar materials to which it is coupled. Potentiosatic techniques are employed to impress potential on sustained loaded notched round- bar specimens. The result is a plot of impressed potential versus time-to- failure; superpositioning of the resultant curves provides a basis for rating the relative susceptibility of various materials to IHE.

Author: Robert Walton Buzzard
Publisher:
ISBN:
Category : Dielectrics
Languages : en
Pages : 36

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Author: American Society for Testing and Materials. Committee G01 on Corrosion of Metals
Publisher:
ISBN:
Category : Metals
Languages : en
Pages : 16

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Author: Ellis E. Fletcher
Publisher:
ISBN:
Category : Steel
Languages : en
Pages : 82

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Book Description
This report deals with the deleterious effects of hydrogen gas on steel at elevated temperatures and/or pressures. Hydrogen attack on steels is manifest as decarburization, intergranular fissuring, or blistering. These conditions result in lowered tensile strength, ductility, and impact strength. The reaction of hydrogen with iron carbide to form methane is probably the most important chemical reaction involved in the attack on steel by hydrogen. Attack of steel at elevated temperatures and pressures is limited or prevented by the following measures: (1) use of steel alloyed with strong carbide-forming elements, (2) use of liners of resistant alloy steels, and (3) substitution of resistant nonferrous alloys.