Embrittlement of Engineering Alloys
Embrittlement of Engineering Alloys

Author: C. L. Briant

Publisher: Elsevier

Published: 2013-10-22

Total Pages: 638

ISBN-13: 148328865X

DOWNLOAD EBOOK

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.

Aluminum Alloys--Contemporary Research and Applications
Aluminum Alloys--Contemporary Research and Applications

Author: A. K. Vasudevan

Publisher: Elsevier

Published: 2012-12-02

Total Pages: 727

ISBN-13: 0323140238

DOWNLOAD EBOOK

This book discusses the structure and properties of the current and potential aluminum alloys in terms of their structure (and structural transformations by new processing methods) and the relationship between structure and mechanical and other properties. The alternative materials that challenge aluminum are considered as well, since the challenge of new competitive materials is a strong influence on innovation. The book bridges the gap between current scientific understanding and engineering practice. It is an up-to-date reference that will be of use to researchers and advanced students in metallurgy and materials engineering.

Gaseous Hydrogen Embrittlement of Materials in Energy Technologies
Gaseous Hydrogen Embrittlement of Materials in Energy Technologies

Author: Richard P Gangloff

Publisher: Elsevier

Published: 2012-01-16

Total Pages: 864

ISBN-13: 0857093894

DOWNLOAD EBOOK

Many modern energy systems are reliant on the production, transportation, storage, and use of gaseous hydrogen. The safety, durability, performance and economic operation of these systems is challenged by operating-cycle dependent degradation by hydrogen of otherwise high performance materials. This important two-volume work provides a comprehensive and authoritative overview of the latest research into managing hydrogen embrittlement in energy technologies.Volume 1 is divided into three parts, the first of which provides an overview of the hydrogen embrittlement problem in specific technologies including petrochemical refining, automotive hydrogen tanks, nuclear waste disposal and power systems, and H2 storage and distribution facilities. Part two then examines modern methods of characterization and analysis of hydrogen damage and part three focuses on the hydrogen degradation of various alloy classesWith its distinguished editors and international team of expert contributors, Volume 1 of Gaseous hydrogen embrittlement of materials in energy technologies is an invaluable reference tool for engineers, designers, materials scientists, and solid mechanicians working with safety-critical components fabricated from high performance materials required to operate in severe environments based on hydrogen. Impacted technologies include aerospace, petrochemical refining, gas transmission, power generation and transportation. Summarises the wealth of recent research on understanding and dealing with the safety, durability, performance and economic operation of using gaseous hydrogen at high pressure Reviews how hydrogen embrittlement affects particular sectors such as the petrochemicals, automotive and nuclear industries Discusses how hydrogen embrittlement can be characterised and its effects on particular alloy classes

Maco/Micro Studies of Hydrogen Embrittlement Mechanisms in Titanium and Aluminum Alloys
Maco/Micro Studies of Hydrogen Embrittlement Mechanisms in Titanium and Aluminum Alloys

Author: W. W. Gerberich

Publisher:

Published: 1981

Total Pages: 25

ISBN-13:

DOWNLOAD EBOOK

Systematic studies of environmental effects on fracture in two alpha/beta titanium alloys, one beta titanium alloy and 7475 aluminum alloys have been accomplished. Ti-6Al-6V-2Sn has been tested for its hydrogen-induced cracking behavior under sustained loads. The influence of frequency and microstructure on fatigue crack growth have also been studied. Fatigue crack growth in Ti-5A1-4Mo, as a function of hydrogen content, temperature and Widmanstatten colony size, was then studied. Mechanical data have been obtained along with TEM and SEM characterizations. Modelling for fatigue thresholds has been attempted to explain dislocation, microstructure and hydrogen effects. Ti-30 Mo has been studied for effects of hydrogen on dislocation dynamics, cleavage fracture stress and fatigue crack propagation. Fractography (SEM) has been used to characterize the fracturing processes and modeling attempted to explain the hydrogen effects. Hydrogen effects in aluminum alloys are not as obvious as those in titanium alloys. Both cathodic and gas-phase charging did not significantly increase the hydrogen content of this material. Mechanical properties did not seem to change decisively after hydrogen charging. But the lack of a macroscopic effect does not preclude a hydrogen mechanism in environmentally assisted events. (Author).

Micromechanics of Hydrogen Embrittlement of Aluminum Alloys
Micromechanics of Hydrogen Embrittlement of Aluminum Alloys

Author: Leonel Stermann

Publisher:

Published: 2021

Total Pages: 0

ISBN-13:

DOWNLOAD EBOOK

Hydrogen embrittlement of structural metallic alloys is an economic and safety concern in many traditional industries and, looking forward, to the energetic transition. However; this phenomenon is still not fully understood. Microstructure scale studies are crucial to elucidate the role of plasticity in the fracture process. The strategy consists in reducing the size of the experimental set up by using a micro tensile machine to observe crack propagation at sub-grain scale in an AlZnMg commercial alloy. Internal hydrogen embrittlement (IHE) and stress corrosion cracking (SCC) tests are performed on notched samples. Single crack propagation is followed by optical microscopy. Digital image correlation (DIC) is used to measure the surface displacement and strain field and determine the crack tip position with a resolution of one micron. Crack propagation velocities and applied stress intensity factor values are obtained. In both IHE and SCC, two different kinds of plastic deformation are observed accompanying the crack propagation. They are finely quantified by DIC. The first kind has the shape of two deformation bands, inclined with respect to the fracture plane, emitted from the crack tip. The second one is an intense deformation just ahead of the crack tip with only a few microns extension. Scanning Electron Microscope examinations of the fracture surface are used to find connections between fracture morphology, local crack speed, and local plasticity intensity at a microscopic scale.

Corrosion of Aluminium
Corrosion of Aluminium

Author: Christian Vargel

Publisher: Elsevier

Published: 2004-10-02

Total Pages: 659

ISBN-13: 0080472362

DOWNLOAD EBOOK

Corrosion of Aluminium highlights the practical and general aspects of the corrosion of aluminium alloys with many illustrations and references. In addition to that, the first chapter allows the reader who is not very familiar with aluminium to understand the metallurgical, chemical and physical features of the aluminium alloys. The author Christian Vargel, has adopted a practitioner approach, based on the expertise and experience gained from a 40 year career in aluminium corrosion This approach is most suitable for assessing the corrosion resistance of aluminium- an assessment which is one of the main conditions for the development of many uses of aluminium in transport, construction, power transmission etc. 600 bibliographic references provide a comprehensive guide to over 100 years of related study Providing practical applications to the reader across many industries Accessible to both the beginner and the expert

Stress Corrosion Cracking of Wrought and P/M High Strength Aluminum Alloys
Stress Corrosion Cracking of Wrought and P/M High Strength Aluminum Alloys

Author: A. W. Thompson

Publisher:

Published: 1986

Total Pages: 23

ISBN-13:

DOWNLOAD EBOOK

The major findings from a comprehensive study on the role of microstructure on the susceptibility to environmental embrittlement of high strength aluminum alloys are presented and discussed. Most of the studies used commercial 7075, or a high purity equiaxed version, HP7075, or a similar powder version 7090. Through the innovative use of loading mode and straining electrode test, stress corrosion cracking was shown to be controlled by the introduction and internal distribution of hydrogen, particularly to grain boundaries. This was the case for the underaged and peak aged microstructures, with the latter being the most susceptible. The SCC behavior of the even more resistant overaged microstructure was shown to be controlled by anodic dissolution processes, predominantly associated with slip bands. Aluminum alloys were also shown to be susceptible to embrittlement under conditions of cathodic polarization correcting a widely held belief that concomitant anodic processes are required. Studies using controlled microstructures were able to rank the importance of different microstructural features to help develop alloy design strategies for more environmentally resistant alloys--the most effective features are those grain interior precipitates which promote fine, homogeneous slip either by reduced particle cutting or enhanced dislocation generation; fine, grain boundary precipitate free zones were found not to be very important, except in their role in reducing the local strength of the boundary region.