Download or read book High Temperature Fracture and Fatigue Crack Growth of a gamma based Titanium Aluminide written by Aindrea Leigh McKelvey and published by . This book was released on 1996 with total page 198 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Investigation of Subcritical Fatigue Crack Growth in Gamma Titanium Aluminides written by and published by . This book was released on 2004 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Our titanium aluminide alloy was readily heat treated to a fully lamellar state by holding at 1345C for 1.5 hours and furnace cooling resulting in a grain size of 330 muon m. The yield stress, ultimate stress, and total elongation were 315MPa, 465MPa, and 0.46% respectively. The fully lamellar microstructure shows significant work hardening. No long cracks initiated at R=0.1 and variation max=300MPa with up to 1.4 million cycles.

Download or read book On the Initiation and Growth of Small Fatigue Cracks in Gamma based Titanium Aluminides written by Jamie Joseph Kruzic and published by . This book was released on 1998 with total page 134 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Evaluation of a Threshold based Model of Fatigue in Gamma Titanium Aluminide Following Impact Damage written by Trevor S. Harding and published by . This book was released on 2000 with total page 532 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Fatigue Crack Growth Behavior of Titanium Aluminide Ti 25Al 25Nb written by SJ. Balsone and published by . This book was released on 1993 with total page 17 pages. Available in PDF, EPUB and Kindle. Book excerpt: The fatigue crack growth rate of an orthorhombic + beta titanium aluminide, nominally Ti-25Al-25Nb, was studied as a function of temperature (25 to 750°C), environment (air and vacuum), frequency (0.001 to 1.0 Hz), and superimposed hold times (1 to 1000 s) under computer-controlled constant Kmax testing conditions. In addition, fatigue crack growth rates from the near-threshold region to rates greater than approximately 10-7 m/cycle were determined at room and elevated temperatures. Results show that the fatigue crack growth rate exhibits a combination of cycle- and time-dependent behavior and is sensitive to environment over the entire temperature range. At elevated temperature, crack growth per cycle is found to increase with decreasing frequency in both laboratory air and vacuum, suggesting a contribution from environmentally assisted crack growth. Growth rates in vacuum are as much as an order of magnitude lower than those obtained in air. Further, hold times of increasing duration are found to slightly decrease and then increase the crack growth rate at elevated temperature. At elevated temperatures, crack growth behavior appears to be a complex interaction of environmental degradation at the crack tip, crack-tip blunting due to creep, and cyclic fatigue (resharpening of the crack tip). An attempt was made to correlate the observed fatigue crack growth rates with the mechanism, or mechanisms, of fracture. The crack growth characteristics were compared with those of the alpha-2 titanium aluminide, Ti-24Al-11 Nb, and a conventional high-temperature titanium alloy, Ti-1100.

Download or read book Fatigue and Fracture of Titanium Aluminides written by M. L. Gambone and published by . This book was released on 1990 with total page 248 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Fatigue and Fracture Behavior of High Temperature Materials written by Peter K. Liaw and published by John Wiley & Sons. This book was released on 2013-10-21 with total page 269 pages. Available in PDF, EPUB and Kindle. Book excerpt: Fatigue and Fracture Behavior of High Temperature Materials ...

Download or read book Elevated Temperature Crack Growth Studies of Advanced Titanium Aluminides written by and published by . This book was released on 1987 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Ordered intermetallic titanium aluminide Ti AL alloyed with niobium possesses attractive high temperature properties and moderate low temperature ductibility. Currently, its application is limited to static components in aircraft gas turbine engines. To extend their use to rotating components of turbine engines, better understanding of life limiting processes such as creep/fatigue crack growth and fracture is required. Phase I of this Air Force Small Business Innovative Research program involved investigation of fatigue crack growth in an alpha two titanium aluminide plus niobium alloy (titanium - 16 wt% aluminum - 10 wt% niobium) as a function of temperature and environment. Computer automated fatigue crack growth tests were conducted in both air and vacuum environments at temperatures ranging from room temperature to 1200 F (649 C). Two heat treatment conditions, namely, beta solution and alpha + beta solution resulted in coarse and fine grain materials, respectively, with varying alpha two morphology. Fractographic analyses were conducted for all test specimens.

Download or read book Gamma Titanium Aluminide Alloys written by Fritz Appel and published by John Wiley & Sons. This book was released on 2011-10-17 with total page 763 pages. Available in PDF, EPUB and Kindle. Book excerpt: The first book entirely dedicated to the topic emphasizes the relation between basic research and actual processing technologies. As such, it covers complex microstructures down to the nanometer scale, structure/property relationships and potential applications in key industries. From the contents: * Constitution * Thermophysical Constants * Phase Transformations and Microstructures * Deformation Behaviour * Strengthening Mechanisms * Creep * Fracture Behaviour * Fatigue * Oxidation Resistance and Related Issues * Alloy Design * Ingot Production and Component Casting * Powder Metallurgy * Wrought Processing * Joining * Surface Hardening * Applications and Component Assessment

Download or read book Gamma Titanium Aluminides 2003 written by Young-Won Kim and published by Minerals, Metals, & Materials Society. This book was released on 2003 with total page 668 pages. Available in PDF, EPUB and Kindle. Book excerpt: A March 2003 meeting provided a forum for scientists to share information on progress in gamma TiAl alloys. Selected papers from the meeting, 77 in all, are presented here, and cover applications, fundamentals, alloy design and development, processing, joining, microstructure-property evaluation, an

Download or read book Fracture Fundamentals in Titanium Aluminides written by and published by . This book was released on 1997 with total page 44 pages. Available in PDF, EPUB and Kindle. Book excerpt: Fracture toughness and fatigue-crack propagation behavior at temperatures between ambient and 800 deg C has been investigated in a wide range of (gamma + alpha2) TiAl microstructures, including single-phase gamma, duplex, coarse lamellar (1-2 mm colony size), fine lamellar ( 150 micron colony size), and a P/M lamellar microstructure ( 65 micron colony size, 0.1 micron lamellar spacing). The influences of colony size, lamellar spacing and volume fraction of equiaxed gamma grains are analyzed in terms of their effects on resistance to the growth of large (>5 mm) cracks. Specifically, coarse lamellar microstructures are found to exhibit the best cyclic and monotonic crack-growth properties, while duplex and single-phase gamma microstructures exhibit the worst, trends which are rationalized in terms of the salient micromechanisms affecting growth. These mechanisms primarily involve crack-tip shielding (R-curve toughening) processes, and include crack closure, crack deflection, and uncracked ligament bridging. However, since the potency of these mechanisms is severely restricted for cracks with limited wake, in the presence of small (

Download or read book Fracture and Fatigue of Gamma Based Titanium Aluminide Intermetallic Alloys written by Nigel Barry Jenkins and published by . This book was released on 1999 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Investigation of Crack Growth in Titanium Aluminide at Elevated Temperatures written by and published by . This book was released on 1988 with total page 131 pages. Available in PDF, EPUB and Kindle. Book excerpt: This study investigates crack growth at elevated temperatures in a titanium-aluminide alloy (Ti3Al). The objectives are to determine the creep crack growth characteristics and the applicability of linear cumulative damage modeling to Ti3Al alloy. All tests were conducted on compact tension specimens of Ti3Al under isothermal conditions. Sustained load tests were used to characterize creep crack growth behavior. A fatigue test and several hold-time tests were used to test the applicability of linear cumulative damage modeling. The linear elastic stress intensity factor, K, was used a correlating parameter for all the tests. A model was generated using baseline data from the sustained load and fatigue tests and compared with the hold-time tests. The test results showed that sustained load crack growth is insensitive to temperature. Crack growth rates for all tested temperatures were only a factor of five apart between the slowest and fastest growth rates. Keywords: Creep, Fatigue, Crack propagation, Titanium aluminide, Damage modeling, Thesis. (jes).

Download or read book Joint EPRI 123HiMAT International Conference on Advances in High Temperature Materials written by J. Shingledecker and published by ASM International. This book was released on 2019-10-01 with total page 1500 pages. Available in PDF, EPUB and Kindle. Book excerpt: Proceedings from: EPRI’s 9th International Conference on Advances in Materials Technology for Fossil Power Plants and the 2nd International 123HiMAT Conference on High-Temperature Materials

Download or read book Room Temperature Fatigue crack Growth and Fracture Behavior in Gamma based TiAl Intermetallics written by Josh Patrick Campbell and published by . This book was released on 1996 with total page 234 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Gamma Titanium Aluminide Alloys written by Fritz Appel and published by John Wiley & Sons. This book was released on 2011-08-04 with total page 763 pages. Available in PDF, EPUB and Kindle. Book excerpt: The first book entirely dedicated to the topic emphasizes the relation between basic research and actual processing technologies. As such, it covers complex microstructures down to the nanometer scale, structure/property relationships and potential applications in key industries. From the contents: * Constitution * Thermophysical Constants * Phase Transformations and Microstructures * Deformation Behaviour * Strengthening Mechanisms * Creep * Fracture Behaviour * Fatigue * Oxidation Resistance and Related Issues * Alloy Design * Ingot Production and Component Casting * Powder Metallurgy * Wrought Processing * Joining * Surface Hardening * Applications and Component Assessment

Download or read book The Fracture and Fatigue of Gamma Based Titanium Aluminides written by Allister William James and published by . This book was released on 1994 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: