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Author: Paul J. Bania Publisher: ISBN: Category : Languages : en Pages : 34
Book Description
Tests were conducted on three recently developed deep-hardenable grade titanium alloys in order to assess their crack propagation and stress corrosion behavior. The alloy compositions are as follows: Alloy no. 334 (Ti-10Mo-6Cr-2.5Al); alloy no. 227 (Ti-7Mo-4Cr-2.5Al); and Alloy no. 253 (Ti-10Mo-8V-2.5Al). Compact tension specimens were cut from 6-inch diameter forging billets in three orientations. Each orientation was subsequently tested for fatigue crack growth rate and stress corrosion susceptibility. While all three alloys exhibited similar fatigue crack propagation characteristics, the chromium containing alloys appeared to be more susceptible to stress corrosion cracking. Scanning electron microscopy of the fracture surfaces revealed the presence of an apparently brittle rod-like phase. While the composition of the rods could not be directly determined, indirect evidence indicated that the rods were titanium borides. These rods were judged to have a significant effect on the fracture toughness and a lesser effect on the crack propagation properties of the alloys.
Author: Paul J. Bania Publisher: ISBN: Category : Languages : en Pages : 34
Book Description
Tests were conducted on three recently developed deep-hardenable grade titanium alloys in order to assess their crack propagation and stress corrosion behavior. The alloy compositions are as follows: Alloy no. 334 (Ti-10Mo-6Cr-2.5Al); alloy no. 227 (Ti-7Mo-4Cr-2.5Al); and Alloy no. 253 (Ti-10Mo-8V-2.5Al). Compact tension specimens were cut from 6-inch diameter forging billets in three orientations. Each orientation was subsequently tested for fatigue crack growth rate and stress corrosion susceptibility. While all three alloys exhibited similar fatigue crack propagation characteristics, the chromium containing alloys appeared to be more susceptible to stress corrosion cracking. Scanning electron microscopy of the fracture surfaces revealed the presence of an apparently brittle rod-like phase. While the composition of the rods could not be directly determined, indirect evidence indicated that the rods were titanium borides. These rods were judged to have a significant effect on the fracture toughness and a lesser effect on the crack propagation properties of the alloys.
Author: T. W. Crooker Publisher: ISBN: Category : Languages : en Pages : 19
Book Description
Fatigue crack propagation was studied in Ti-6Al-4V, Ti-7Al-2Cb-1Ta, Ti-6Al-6V-2Sn-1Cu-0.5Fe, Ti-6Al-3V-1Mo, and Ti-7Al-2.5Mo alloys. These materials possess yield strengths in excess of 100 ksi, combined with favorable levels of fracture toughness, and they are currently under evaluation for application in large welded structures. Where an application involves repetitive loading, a knowledge of fatigue crack propagation characteristics is required for failure-safe design against fracture. Fabrication and non-destructive testing procedures cannot guarantee that cracklike defects, which can grow to a critical size, will not be present in plate-thickness sections containing welded joints. In addition, the role of an aggressive environment, such as salt water, in this failure mechanism is of the utmost importance. Fatigue crack propagation data were taken in both ambient room air and 3.5% salt-water environments. Surface-notched plate bend specimens were cycled in full-reverse (tension-to-compression) sinusoidal loading. The fatigue crack was observed optically, and the crack growth rate was described as an empirical power-law function of the total (elastic-plus-plastic) strain range. Fatigue crack growth rate relationships were first developed in an air environment and then employed as baselines for establishing the effect of the salt-water environment. Comparisons were made among the fatigue crack propagation characteristics of the several titanium alloys and among a broad spectrum of high-strength structural alloys, both ferrous and nonferrous, previously studied. (Author).
Author: Publisher: ISBN: Category : Power resources Languages : en Pages : 564
Book Description
Semiannual, with semiannual and annual indexes. References to all scientific and technical literature coming from DOE, its laboratories, energy centers, and contractors. Includes all works deriving from DOE, other related government-sponsored information, and foreign nonnuclear information. Arranged under 39 categories, e.g., Biomedical sciences, basic studies; Biomedical sciences, applied studies; Health and safety; and Fusion energy. Entry gives bibliographical information and abstract. Corporate, author, subject, report number indexes.
Author: JC. Chesnutt Publisher: ISBN: Category : Crack propagation Languages : en Pages : 39
Book Description
This paper describes the results of a program conducted to develop a metastable ? titanium alloy with deep hardening characteristics and with a yield strength of 1165 MPa (170 ksi), a fracture toughness of 66 MPam (60 ksiin), and tensile ductility of 12 percent elongation and 18 percent reduction of area. After a screening study, three compositions were chosen: Ti-10Mo-6Cr-2.5A1 (Alloy 334), Ti-7Mo-4Cr-2.5A1 (Alloy 227), and Ti-10Mo-8V-2.5A1 (Alloy 253). Both ?-working and ? followed by ?-? working were investigated as means of controlling the primary ? distribution. Three distinct microstructures were subjected to extensive testing together with microstructural and fractographic analysis. It was found that grain boundary ? was detrimental to properties in most cases. Stringered ?, resulting from ?-working, caused a directionality in mechanical properties with longitudinal values being higher than those in the transverse direction. Lenticular primary ? was generally beneficial to toughness, whereas equiaxed or globular primary ? was beneficial to tensile ductility. The predominant role of secondary (aged) ? was in influencing strength level. The causes for these property variations with ? phase morphology were analyzed using metallographic fracture face profiling and scanning electron fractography. It was found that the ?-? interfaces initiate fracture and thus have a large influence on fracture related properties. Finally, the properties of the three metastable ? alloys were compared to those of high strength, deep hardening ?/? alloys. More attractive strength-toughness combinations are achievable in the metastable ? alloys. The tensile ductilities of the ?-? alloys were somewhat higher than those of the metastable ? alloys. However, ductilities of the latter class of alloys were acceptable.
Author: Paul J. Bania
Author: Paul J. Bania
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Author: Norman Edward Frost
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Author: T. W. Crooker
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Author: Benjamin Floyd Brown
Author: JC. Chesnutt
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