The Hydrogen Embrittlement Susceptibility of Ferrous Alloys PDF Download
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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: 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: Eric K. Hoffman
Publisher:
ISBN:
Category : Iron alloys
Languages : en
Pages : 194
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Book Description
Author: Louis Raymond
Publisher: ASTM International
ISBN: 0803109598
Category : Metals
Languages : en
Pages : 429
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Book Description
Author: W. Y. Chu
Publisher:
ISBN:
Category :
Languages : en
Pages : 23
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Book Description
In many alloy systems, hydrogen embrittlement under relatively high fugacity conditions occurs by intergranular fracture. One of these is the iron nickel alloy system which exhibits intergranular hydrogen related fracture when tested with a high supersaturation of solute hydrogen or while being cathodically charged with hydrogen. The results obtained on this alloy system indicate that the hydrogen embrittlement susceptibility decreases as the iron concentration of the alloy increased. These early measurements contained no information about the grain boundary chemistry and it is known that the effects of hydrogen are generally sensitive to the concentrations of other elements at grain boundaries. One particular element, sulphur, is known to increase the susceptibility of nickel alloys and fe alloys to hydrogen embrittlement although the mechanism of this increased susceptibility is not known. (JES).
Author: Richard A. Oriani
Publisher: William Andrew
ISBN:
Category : Technology & Engineering
Languages : en
Pages : 920
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Book Description
Author: C. L. Briant
Publisher: Elsevier
ISBN: 148328865X
Category : Technology & Engineering
Languages : en
Pages : 638
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Book Description
Treatise on Materials Science and Technology, Volume 25: Embrittlement of Engineering Alloys is an 11-chapter text that describes some situations that produce premature failure of several engineering alloys, including steels and nickel- and aluminum-base alloys. Chapters 1 to 3 consider situations where improper alloy composition, processing, and/or heat treatment can lead to a degradation of mechanical properties, even in the absence of an aggressive environment or an elevated temperature. Chapters 4 and 5 examine the effect of elevated temperatures on the mechanical properties of both ferrous and nonferrous alloys. Chapters 6 and 7 discuss the effects of corrosive environments on both stressed and unstressed materials. In these environments anodic dissolution is the primary step that leads to failure. Chapters 8 to 10 deal with the effects of aggressive environments that lead to enhanced decohesion or embrittlement of the metal, such as hydrogen, liquid metal, and irradiation-induced embrittlement. Chapter 11 looks into the embrittlement phenomena occurring during welding, one of the most common processing conditions to which a material could be subjected. This book will prove useful to materials scientists and researchers.
Author: Raymond L.
Publisher: ASTM International
ISBN:
Category :
Languages : en
Pages : 274
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Book Description
Author: Stephen W. Smith
Publisher:
ISBN:
Category :
Languages : en
Pages : 608
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Book Description
Author: Mahmoud Y. Demeri
Publisher: ASM International
ISBN: 1627080058
Category : Business & Economics
Languages : en
Pages : 312
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Book Description
Examines the types, microstructures and attributes of AHSSAlso reviews the current and future applications, the benefits, trends and environmental and sustainability issues.
Author: Tuhin Das
Publisher:
ISBN:
Category :
Languages : en
Pages :
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Book Description
"Hydrogen embrittlement (HE) is identified as a serious problem even after decades of extensive research, in various industries starting from aerospace to fastener. HE is primarily responsible for the degradation of mechanical performances of a number of metals and alloys that are used nowadays. Among them, high strength steels owing to their widespread applications also suffer from HE failures to a great deal. Hence, this thesis focuses on fundamental issues influencing the susceptibility of three different grades of high strength steels designed for fastener applications.The present work includes investigation of mechanical properties both in presence and absence of hydrogen, microstructural characterisations and direct hydrogen quantification. The mechanical property test methodology is a modification of the ASTM F1624 standard test method to determine hydrogen embrittlement threshold in steels, which facilitates a unique approach to investigate the HE susceptibility of these steel grades. The microstructural characterisation process involves scanning electron microscopy (SEM), electron backscattered diffraction (EBSD) and transmission electron microscopy (TEM) to identify the potential hydrogen trap states in microstructure, both qualitatively and quantitatively. Microstructural characterisation also provides useful information to predict local microstructural evolution in the presence of hydrogen and stress. Altogether, a structure-property relationship has been developed for these materials employing a comprehensive investigation process. In addition to it, fracture surface mapping using SEM indicates the mechanisms of failure associated with HE process in these materials. And finally, direct hydrogen quantification methodology using thermal desorption spectroscopy (TDS) provides further experimental evidence to the above-mentioned facts. Thus, in this work a combined approach involving various research techniques and knowledge has been utilised to investigate the susceptibility of the steel grades and rank them according to their performances under the influence of hydrogen." --
