Download or read book The Effects of Thermomechanical Processing and Annealing on the Microstructural Evolution and Stress Corrosion Cracking of Alloy 690 written by Cody A. Miller and published by . This book was released on 2016 with total page 151 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Metals Abstracts written by and published by . This book was released on 1998 with total page 1042 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Modeling Microstructural Evolution During Recrystallization of Hot Rolled High Strength Aluminum Alloy 7050 written by Khaled F. M. Adam and published by . This book was released on 2015 with total page 122 pages. Available in PDF, EPUB and Kindle. Book excerpt: Finally, to prove the benefits of integrating the experiment into the simulation model and make the simulation more realistic an initial structure was obtained a real as-deformed microstructure by Electron Back scatter diffraction (EBSD) as well as the second phase particles distribution was determined by Backscattered Electrons (BSE).
Download or read book Metals Abstracts Index written by and published by . This book was released on 1996 with total page 1622 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Stress Corrosion Cracking Behavior of Friction Stir Processed Ultrafine Grained Light Metal Alloys written by Gaurav Ramchandra Argade and published by . This book was released on 2012 with total page 354 pages. Available in PDF, EPUB and Kindle. Book excerpt: "The influence of friction stir processing (FSP), a microstructural modification tool, on the corrosion behavior of Al-Mg, Al-Mg-Sc, Mg-Al-Zn and Mg-Y-RE alloys has been studied. An attempt has been made to establish correlation between processing parameters and the subsequent microstructural evolution especially matrix grain size on the corrosion and stress corrosion properties of the alloys. A relationship between grain size and corrosion rate for Mg-Y-RE alloys was envisaged and power law type behavior was proposed. Ultrafine fine grained (UFG) microstructure showed one order magnitude lower corrosion rate. Grain refinement achieved through different FSP parameters showed lower corrosion currents for Al-Mg alloy as compared to the base alloy. The significant increment in linear polarization resistance of UFG Al-Mg-Sc alloy has been attributed to modification in chemistry and grain refinement. The slow strain rate testing (SSRT) results indicated no stress corrosion susceptibility for FSP Al-Mg alloy. A critical grain size for Al-Mg alloys has been proposed to show optimum general corrosion resistance with no stress corrosion cracking (SCC) susceptibility. AZ31 microstructures showed significant loss of ductility during SSRT in corrosive medium indicating high SCC susceptibilities. The higher SCC resistance of over aged Mg-Y-RE microstructure as compared to under aged and peak aged was attributed to the alteration in microchemistry and precipitate morphology in the matrix"--Abstract, leaf iv.
Download or read book Effects of Thermomechanical Processing on Strength and Toughness of Iron 12 percent nickel Reactive Metal Alloys at 196C written by Joseph R. Stephens and published by . This book was released on 1978 with total page 38 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Stress corrosion Cracking in High Strength Steels and in Titanium and Aluminum Alloys written by Benjamin Floyd Brown and published by . This book was released on 1972 with total page 390 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Macrostructure and Micro Chemistry Analysis on Stress Corrosion Cracking SCC of Alloy 690 written by Lemi Gemechu Geda and published by . This book was released on 2013 with total page 64 pages. Available in PDF, EPUB and Kindle. Book excerpt: Abstract: Alloy 690 has been studied to understand, predict, and avoid costly and dangerous failures that could occur due to SCC. The main goal of the present study is to study the relationship between the structural nature, chemical properties and mechanical properties on and near grain boundaries in alloy 690 to identify their role in the resistance and susceptibility to SCC. The microstructure and microchemistry of alloy 690 at the SCC surface and crack fronts has been studied to improve the fundamental understanding of primary water stress corrosion cracking (PWSCC).
Download or read book Microstructural Effects on Microdeformation and Primary side Stress Corrosion Cracking of Alloy 600 Tubing written by S. M. Bruemmer and published by . This book was released on 1987 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Effects of Thermomechanical Processing on Strength and Toughness of Iron 12 percent nickel Reactive Metal Alloys at 196 C written by Joseph R. Stephens and published by . This book was released on 1978 with total page 40 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Precipitate Coarsening During Overaging of 2519 Al Cu Alloy Application to Superplastic Processing written by and published by . This book was released on 1992 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Overaging experiments have been conducted on a commercial grade 2519 Al-Cu alloy at a variety of temperatures and times, with and without prior induced strain. Hardness testing and scanning electron microscopy techniques were used to characterize evolution of microstructure during overaging. The further development of microstructure during thermomechanical processing by warm rolling was also assessed to determine whether the coarse particles produced by overaging could serve as sites for particle stimulated nucleation (PSN) of recrystallization. The thermomechanical processing methods have been shown to produce highly superplastic microstructures in Al-Mg and Al-Mg-Li alloys in previous work at NPS. Optical microscopy and tensile tests were conducted allowing a determination of the effect of the processing on the microstructural evolution and superplastic behavior of the Al-Cu material. Aluminum-Copper Alloys, Superplasticity, Thermomechanical Process.
Download or read book Precipitate Coarsening During Overaging of 2519 Al Cu Alloy Application to Superplastic Processing written by Wayne J. Mathé and published by . This book was released on 1992 with total page 70 pages. Available in PDF, EPUB and Kindle. Book excerpt: Overaging experiments have been conducted on a commercial grade 2519 Al-Cu alloy at a variety of temperatures and times, with and without prior induced strain. Hardness testing and scanning electron microscopy techniques were used to characterize evolution of microstructure during overaging. The further development of microstructure during thermomechanical processing by warm rolling was also assessed to determine whether the coarse particles produced by overaging could serve as sites for particle stimulated nucleation (PSN) of recrystallization. The thermomechanical processing methods have been shown to produce highly superplastic microstructures in Al-Mg and Al-Mg-Li alloys in previous work at NPS. Optical microscopy and tensile tests were conducted allowing a determination of the effect of the processing on the microstructural evolution and superplastic behavior of the Al-Cu material. Aluminum-Copper Alloys, Superplasticity, Thermomechanical Process.
Download or read book Stress Corrosion Cracking of Alloys 600 and Alloy 690 in All Volatile Treated Water at Elevated Temperatures written by and published by . This book was released on 1983 with total page 67 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Stress corrosion cracking of Alloy 600 and Alloy 690 in all volatile treated water at elevated temperatures written by George J. Theus and published by . This book was released on 1983 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Effects of Thermal History and Microstructure on the Stress Corrosion Cracking Behavior of Inconel X 750 in Aqueous Systems at 650 F 680 F 343 C 360 C written by F. W. Pement and published by . This book was released on 1980 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Stress Corrosion Cracking Behavior of Alloy 600 in High Temperature Water written by and published by . This book was released on 1995 with total page 16 pages. Available in PDF, EPUB and Kindle. Book excerpt: SCC susceptibility of Alloy 600 in deaerated water at 360 C (statically loaded U-bend specimens) is dependent on microstructure and whether the material was cold-worked and annealed (CWA) or hot-worked and annealed (HWA). All cracking was intergranular, and materials lacking grain boundary carbides were most susceptible to SCC initiation. CWA tubing materials are more susceptible to SCC initiation than HWA ring-rolled forging materials with similar microstructures (optical metallography). In CWA tubing materials, one crack dominated and grew to a visible size. HWA materials with a low hot-working finishing temperature (925 C) and final anneals at 1010-1065 C developed both large cracks (similar to those in CWA materials) and small intergranular microcracks detectable only by destructive metallography. HWA materials with a high hot-working finishing temperature (980 C) and a high-temperature final anneal (>1040 C), with grain boundaries that are fully decorated, developed only microcracks in all specimens. These materials did not develop large, visually detectable cracks, even after more than 300 weeks exposure. A low-temperature thermal treatment (610 C for 7h), which reduces or eliminates SCC in Alloy 600, did not eliminate microcrack formation in high temperature processed HWA materials. Conventional metallographic and analytical electron microscopy (AEM) were done on selected materials to identify the factors responsible for the observed differences in cracking behavior. Major difference between high-temperature HWA and low-temperature HWA and CWA materials was that the high temperature processing and final annealing produced predominantly ''semi-continuous'' dendritic M--C3 carbides along grain boundaries with a minimal amount of intragranular carbides. Lower temperature processing produced intragranular M7C3 carbides, with less intergranular carbides.
Download or read book The Effect of Strain Path on Microstructure and Crystallographic Texture Evolution in Aluminium Alloy AA5052 written by Oliver Hernandez Silva and published by . This book was released on 2009 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: In commercial thermomechanical processing, metals and alloys are often subjected to complex deformation histories, including changes in the strain rate, temperature and strain path. Due to the complicated nature of the sequences of deformations that thermomechanical processes need to create a final product, the strain path experienced by the majority of volume elements in the material is complicated. However, the relationship between the strain path and the microstructure/texture evolution is not well predicted by current models used in industrial processes. The important properties in metals are sensitive to the anisotropic microstructure of the metal produced via thermomechanical processing. This anisotropy includes crystallographic texture, grain shape, the shape and spatial distribution of particles and deformation induced dislocation boundaries. An understanding of the origin of these microstructural features is, therefore, critical for future improvements in properties. To some extent, under linear deformation conditions the evolutions of parameters are well known. This can not be said, however, for non-linear deformation conditions. In this work the effect of strain path on microstructure and texture evolution of the aluminium alloy AA5052 under hot working conditions has been investigated. Specimens were produced with a wide range of strain paths with many also statically annealed to investigate different stages of recrystallization. The microstructures and textures created in the specimens were then studied using electron backscattered diffraction (EBSD) and the subsequent develop of a program that analyses the recrystallization fraction of the material in function of the crystallographic orientatio. The deformed strain path specimens were created using the Arbitrary Strain Path machine at the University of Sheffield, which is capable of torsion and tension/compression testing. Tests from a single step of torsion through to multiple steps with combined forms of strain, using one, two or more steps of deformation with a value of equivalent strain of 0.25 and small reverse deformation for selected tests of equivalent strain of 0.05. I , , The microstructures formed by the applied deformation and annealing processes were analyzed using EBSD to create profiles that show the behaviour of the microstructures and textures under the different strain paths. More detailed analysis was then carried out using in-house software. The program used quaternion geometry to calculate the mean orientation of each grain and then used the deviation from the mean to analyse the extent of substructure within the grains which enabled the recrystallization fraction for each strain path condition to be calculated. The results show a clear difference between the recrystallization behaviour and the respond of microstructure result of strain path with an equivalent strain of 0.05 of deformation applied on the reverse deformation. The small reverse conditions are quite different showing that applying the small reverse deformation after two steps of forward deformation presents material with significant substructure than just two steps of forward deformation, meanwhile when the small reverse deformation is applied after one step of forward deformation the amount of material with significant substructure decreases. 1I.
