Download or read book The Study of the Mechanism of Transgranular Stress Corrosion Cracking in Fcc Materials written by Lijun Zhong and published by . This book was released on 1992 with total page 164 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Stress Corrosion Cracking written by V S Raja and published by Elsevier. This book was released on 2011-09-22 with total page 817 pages. Available in PDF, EPUB and Kindle. Book excerpt: The problem of stress corrosion cracking (SCC), which causes sudden failure of metals and other materials subjected to stress in corrosive environment(s), has a significant impact on a number of sectors including the oil and gas industries and nuclear power production. Stress corrosion cracking reviews the fundamentals of the phenomenon as well as examining stress corrosion behaviour in specific materials and particular industries. The book is divided into four parts. Part one covers the mechanisms of SCC and hydrogen embrittlement, while the focus of part two is on methods of testing for SCC in metals. Chapters in part three each review the phenomenon with reference to a specific material, with a variety of metals, alloys and composites discussed, including steels, titanium alloys and polymer composites. In part four, the effect of SCC in various industries is examined, with chapters covering subjects such as aerospace engineering, nuclear reactors, utilities and pipelines. With its distinguished editors and international team of contributors, Stress corrosion cracking is an essential reference for engineers and designers working with metals, alloys and polymers, and will be an invaluable tool for any industries in which metallic components are exposed to tension, corrosive environments at ambient and high temperatures. Examines the mechanisms of stress corrosion cracking (SCC) presenting recognising testing methods and materials resistant to SCC Assesses the effect of SCC on particular metals featuring steel, stainless steel, nickel-based alloys, magnesium alloys, copper-based alloys and welds in steels Reviews the monitoring and management of SCC and the affect of SCC in different industries such as petrochemical and aerospace
Download or read book Anisotropy of Crack growth in Transgranular Stress corrosion Cracking of Fcc Materials written by Lijun Zhong and published by . This book was released on 1994 with total page 278 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Mechanism of Stress Corrosion Cracking in Face centered cubic Metals written by R. A. DODD and published by . This book was released on 1965 with total page 5 pages. Available in PDF, EPUB and Kindle. Book excerpt: The work was designed firstly to examine the possibility of the existence of a universal mechanism of transgranular stress corrosion cracking, originally postulated by Robertson and Tetelman, and later, when such a mechanism was substantially disproved, to examine possible cracking mechanisms in various alloy systems of interest. The experimental techniques employed included the determination of times to complete fracture under stress corrosion conditions, potentiostatic studies of polarization phenomena, etc., and electron microscope investigations of dislocation configurations and estimates of the related stacking fault energies.
Download or read book Stress corrosion Cracking written by Russell H. Jones and published by ASM International(OH). This book was released on 1992 with total page 466 pages. Available in PDF, EPUB and Kindle. Book excerpt: Details the many conditions under which stress-corrosion cracking (SCC) can occur, the parameters which control SCC, and the methodologies for mitigating and testing for SCC, plus information on mechanisms of SCC with experimental data on a variety of materials. Contains information about environmen
Download or read book Stress Corrosion Cracking Of Metals A State of the Art written by H. Lee Craig and published by ASTM International. This book was released on 1972 with total page 174 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Mechanism of Stress Corrosion Cracking written by E. Neville Pugh and published by . This book was released on 1977 with total page 16 pages. Available in PDF, EPUB and Kindle. Book excerpt: A study has been made of the corrosion and SCC of copper and alpha-phase Cu-Zn alloys in 1N ammoniacal solutions. Potentiostatic experiments confirmed that the corrosion process in non-tarnishing solutions is under concentration polarization, being controlled by the transport of the main cathodic species (cupric complex ions) to the surface, and established the reversible potential, the exchange current density and the Tafel slope for the main anodic reaction, copper dissolution. The conditions for tarnish formation and the nature of this cuprous-oxide layer were also studied. Potentiostatic studies of the potential dependence of SCC of annealed Cu-30Zn established that the critical potential for cracking corresponds to the reversible potential for copper dissolution. Moreover, SCC was shown to be predominantly intergranular in potential ranges where tarnishing occurs and transgranular in non-tarnishing ranges. These and other observations lend support to our view that inter- and transgranular SCC involve different mechanisms. The former is considered to occur by the film-rupture model. The mechanism of transgranular cracking has not been established, but fractographic and accoustic-emission studies of both Cu-30Zn and Admiralty Metal indicated that this form of cracking occurs by discontinuous cleavage on (110) planes. (Author).
Download or read book Experiments to Explore the Mechanisms of Stress Corrosion Cracking written by Jie Gao and published by . This book was released on 2011 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: "Stress corrosion cracking (SCC) is a type of subcritical cracking of materials that occurs when a SCC susceptible material is simultaneously stressed in tension (applied or residual) and exposed to a specific corrosive environment. Failure of materials due to SCC could occur at stress levels much lower than the allowable service stress, causing catastrophic consequences. Decades of efforts to investigate the SCC phenomena have established the general behaviors of different materials during SCC and it is widely accepted that a susceptible material, tensile stress, and a specific corrosive environment are the prerequisites for the occurrence of SCC. However, the fundamental mechanisms behind the apparent SCC behaviors remain unclear mainly due to contradictory experimental data from different researchers, the intrinsic difficulties associated with material characterization within the restricted geometry of cracks, and the complexity of the interactions between different chemical species. In this thesis, attention is focused on a single material system, AA5083 aluminum alloy, where the SCC can be made to happen quickly so that the effects of various aspects on SCC can be examined within reasonable amounts of time, for the purpose of mechanistic study. To clear the controversies about the actual SCC behaviors and to better understand the basic mechanisms of SCC, all of the three prerequisites of SCC, i.e. susceptible material, tensile stress, and corrosive environment, have been carefully examined using various materials characterization techniques. For the metallurgical aspect (susceptible material), AA5083 aluminum alloy (Al-4.4Mg-0.7Mg-0.15Cr) has been intentionally annealed at 175 °C, a process called sensitization, for a series of progressively longer treatment times. The SCC behaviors, microstructures, mechanical properties, and electrochemical properties of these differently heat treated AA5083 specimens have been characterized. It is found that the SCC incubation time decreases for longer sensitization time while the SCC initial crack growth rate increases as sensitization time becomes longer. This phenomenon is explained as a result of the development of continuous films of anodic intermetallic, Mg2Al3, known as [beta]-phase, on the grain boundaries as sensitization time increases, based on the microstructural, electrochemical, and mechanical characterizations. For the environmental aspect (corrosive environment), the SCC behaviors, as well as microstructures, of AA5083 sensitized for both 120 and 240 hours have been examined in sodium chloride (NaCl) solutions with different concentrations and pH. It has been found that both higher NaCl concentration and lower pH values lead to shorter incubation time, higher initial crack growth rate and higher total crack growth, and the SCC behaviors of the specimens that have been sensitized for 240 hours are more sensitive to environmental factors, compared with their counterparts with 120 hours sensitization condition. The fractographic analysis demonstrates the cracking mechanism is independent of the environmental factors and is still anodic dissolution based intergranular separation. The interactions between mechanical driving force (stress intensity) and chemical driving force (NaCl concentration) are also discovered. For the mechanical aspect (tensile stress), the SCC behaviors of sensitized AA5083 with different initially applied stress intensity levels have been investigated. It is found that the incubation time is a chemical process while the initial crack growth rate and total crack propagation are determined by both mechanical and chemical driving forces. The interactions between mechanical and chemical driving forces are described as a process that is dominated by chemical driving force and only assisted by mechanical driving force. Additionally, the crack mechanism is found to be anodic dissolution as well, for all different starting stress intensities. All of the above experimental efforts indicate that anodic dissolution is the dominant mechanism for SCC in sensitized AA5083 alloy."--Leaves v-vii
Download or read book Stress corrosion Cracking written by Warren E. Berry and published by . This book was released on 1961 with total page 36 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book A Study of Transgranular Stress corrosion Cracking in Copper 25a gold Single Crystals written by Mengke Zhu and published by . This book was released on 1990 with total page 368 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Mechanisms of Environment Sensitive Cracking of Materials written by Peter Roland Swann and published by . This book was released on 1977 with total page 646 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book On the mechanism s of stress corrosion cracking written by E. N. Pugh and published by . This book was released on 1965 with total page 65 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Exploration of the Mechanisms of Corrosion Creep and Stress Corrosion Cracking written by Quanhe Wan and published by . This book was released on 2012 with total page 149 pages. Available in PDF, EPUB and Kindle. Book excerpt: "Stress Corrosion Cracking (SCC) is a type of subcritical cracking of materials that occurs as a result of simultaneous interactions among tensile stress, a corrosive environment, and a susceptible material. It causes slow, sub-critical crack growth at relatively low tensile stress, and results in sudden, catastrophic fast fracture when the critical crack size is reached. In this thesis, attention is focused on the mechanisms of intergranular SCC that commonly occur in aluminum alloys, based on mechanical models that involve cracking of two types of grain boundary segments: those without precipitates and those that contain high coverage of precipitate particles. For cracking along grain boundary segments without precipitates, slow strain rates at crack tips are thought to control the kinetics of crack growth, which are comparable to the strain rates during creep that produces a continuous deformation and elongation of the sample surface. In order to simplify the SCC system and obtain a better understanding of the process at work, we separate the strain and surface deformation from the complex geometry of the crack tip, and study the creep behaviors of AA1100 aluminum alloys in various corrosive environments. Experimental results show a great effect of pH and polarizations on the creep behavior, demonstrating reproducible strain rate enhancements consistent with the general corrosion behavior of AA1100. Based on the observations, two possible explanations for the environmental influences on creep strain rates are discussed relating to the anodic dissolution of the free surface and hydrogen influences on deformation mechanisms. By analyzing the effect of corrosive environments on creep behavior and by incorporating detailed effects of pH and polarization, additional insights into the mechanisms of SCC, as well as the role of environmentally affected deformation during SCC propagation, have become apparent. For the cracking along grain boundary segments with a high coverage of precipitates, an electrochemical dissolution controlled cracking mechanism is proposed in this thesis, based on extensive SEM and EDS studies on a sensitized AA5083 specimen that has experienced observable SCC in NaCl solutions. The degree of matching on the two separate fractures of SCC region is evaluated in a range of magnifications and compared with other regions. The observations indicate the real stress corrosion cracking process of AA5083 as a multi-stage process, simultaneously controlled by an electrochemistry based dissolution mechanism on the [beta]-phase covered grain boundaries, and a mechanically-assisted separation mechanism on the grain boundary regions that do not contain precipitates"--Pages v-vi.
Download or read book Improvement of Stress Corrosion Cracking SCC Resistance by Cyclic Pre Straining in FCC Materials written by T. Magnin and published by . This book was released on 2000 with total page 9 pages. Available in PDF, EPUB and Kindle. Book excerpt: Improving the materials resistance to SCC has become a topic of wide interest for theoretical, engineering and financial reasons. The aim of this paper is to propose a process to delay the SCC damage. Recent studies of 316L austenitic stainless steel in boiling MgCl2 solutions show an improvement in SCC resistance by cyclic pre-straining in low cycle fatigue [1]. This improvement consists of an increase in both strain to failure and crack initiation strain, during Slow Strain Rate Tensile (SSRT) tests in aqueous solution.
Download or read book Stacking Fault Energy Ordering and Transgranular Stress Corrosion Cracking in Fe Cr Ni Alloys written by Walter Ray Roser and published by . This book was released on 1963 with total page 52 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book A Study of the Mechanism of Stress Corrosion Cracking in the Iron nickel Chromium Alloy System written by R. W. STACHLE and published by . This book was released on 1969 with total page 47 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book The Mechanism of Stress Corrosion Cracking of Austenitic Stainless Steels written by Julius J. Harwood and published by . This book was released on 1960 with total page 8 pages. Available in PDF, EPUB and Kindle. Book excerpt: The purpose of this discussion is to assess the state of our understanding concerning the factors and mechanism(s) which determine and control the susceptibility to stress-corrosion cracking of the austenitic stainless steels. The growing importance of this problem has led to a considerable amount of research, both in this country and abroad, aimed at delineating more specifically the environmental, compositional, and structural conditions involved and at elucidating the underlying mechanism for the cracking phenomenon. As a result of this research effort, a number of mechanisms have been proposed, but all appear to contain certain deficiencies in explaining certain of the characteristic features of the stress-corrosion cracking process; that is to say, unequivocal arguments cannot be presented in behalf of any of the proposed mechanisms. Possibly more to the point is the fact that few of the currently debated mechanisms have yielded critical clues which could lead to compositional or structural modifications of commercial materials to reduce or prevent the incidence of cracking. It is encouraging to note, however, that the more recent experimental evidence is developing a basis whereby critical type of experiments can be designed to differentiate clearly the mode of damage.
