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The Effects Of Carburizing Environments On Elevated Temperature Fatigue Crack Growth Behavior In The Nickel Base Superalloy Nimonic 115
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Book Synopsis The Effects of Carburizing Environments on Elevated Temperature Fatigue Crack Growth Behavior in the Nickel-base Superalloy Nimonic 115 by : Carl J. White
Download or read book The Effects of Carburizing Environments on Elevated Temperature Fatigue Crack Growth Behavior in the Nickel-base Superalloy Nimonic 115 written by Carl J. White and published by . This book was released on 1981 with total page 222 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Masters Theses in the Pure and Applied Sciences by : Wade Shafer
Download or read book Masters Theses in the Pure and Applied Sciences written by Wade Shafer and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 335 pages. Available in PDF, EPUB and Kindle. Book excerpt: Masters Theses in the Pure and Applied Sciences was first conceived, published, and disseminated by the Center for Information and Numerical Data Analysis and Synthesis (CINDAS) * at Purdue University in 1957, starting its coverage of theses with the academic year 1955. Beginning with Volume 13, the printing and dissemination phases of the activity were transferred to University Microfilms/Xerox of Ann Arbor, Michigan, with the thought that such an arrangement would be more beneficial to the academic and general scientific and technical community. After five years of this joint undertaking we had concluded that it was in the interest of all con cerned if the printing and distribution of the volume were handled by an international publishing house to assure improved service and broader dissemination. Hence, starting with Volume 18, Masters Theses in the Pure and Applied Sciences has been disseminated on a worldwide basis by Plenum Publishing Cor poration of New York, and in the same year the coverage was broadened to include Canadian universities. All back issues can also be ordered from Plenum. We have reported in Volume 26 (thesis year 1981) a total of 11 ,048 theses titles from 24 Canadian and 21 8 United States universities. We are sure that this broader base for these titles reported will greatly enhance the value of this important annual reference work. While Volume 26 reports theses submitted in 1981, on occasion, certain univer sities do report theses submitted in previous years but not reported at the time.
Book Synopsis Threshold Crack Growth Behavior of Nickel-Base Superalloy at Elevated Temperature by : NE. Ashbaugh
Download or read book Threshold Crack Growth Behavior of Nickel-Base Superalloy at Elevated Temperature written by NE. Ashbaugh and published by . This book was released on 1989 with total page 11 pages. Available in PDF, EPUB and Kindle. Book excerpt: An experimental program was conducted to evaluate the effects of frequency and R on the near-threshold crack growth behavior of Inconel 718 at 649°C in laboratory air. Frequencies from 0.01 to 400 Hz and R from 0.1 to 0.9 were applied to compact tension [C(T)] and middle- or center-cracked tension [M(T)] specimens under decreasing-K conditions using computer-controlled test machines. Digital load-displacement data were obtained to determine crack length and closure load. The fatigue crack growth threshold in Inconel 718 at 649°C obtained using decreasing ?K testing was generally associated with a crack arrest phenomenon which could be attributed to the buildup of oxides with time. Over the ranges of R and v used in this investigation, the growth rate behavior at the onset of crack arrest appears to be a combination of time-dependent and cyclic-dependent behavior. Even at 400 Hz, purely cyclic behavior was apparently never reached. For crack growth rate modeling, both frequency and stress ratio have to be incorporated in the characterization of ?Kth. Over the ranges of parameters tested, a cyclic threshold was approached at high frequencies and low R and a sustained load time-dependent threshold was obtained at high R, indicating that the cyclic contribution to the growth rate was negligible.
Book Synopsis Effect of Dwell-times on Crack Propagation in Superalloys by : Jonas Saarimäki
Download or read book Effect of Dwell-times on Crack Propagation in Superalloys written by Jonas Saarimäki and published by Linköping University Electronic Press. This book was released on 2015-12-10 with total page 49 pages. Available in PDF, EPUB and Kindle. Book excerpt: Gas turbines are widely used in industry for power generation and as a power source at "hard to reach" locations where other possibilities for electrical supply are insufficient. There is a strong need for greener energy, considering the effect that pollution has had on global warming, and we need to come up with ways of producing cleaner electricity. A way to achieve this is by increasing the combustion temperature in gas turbines. This increases the demand on the high temperature performance of the materials used e.g. superalloys in the turbine. These high combustion temperatures can lead to detrimental degradation of critical components. These components are commonly subjected to cyclic loading of different types e.g. combined with dwell-times and overloads at elevated temperatures, which influence the crack growth. Dwell-times have shown to accelerate crack growth and change the cracking behaviour in both Inconel 718 and Haynes 282. Overloads at the beginning of the dwell-time cycle have shown to retard the dwell time effect on crack growth in Inconel 718. To understand these effects more microstructural investigations are needed. The work presented in this licentiate thesis was conducted under the umbrella of the research program Turbo Power; "High temperature fatigue crack propagation in nickel-based superalloys", concentrating on fatigue crack growth mechanisms in superalloys during dwell-times, which have shown to have a devastating effect on the crack propagation behaviour. Mechanical testing was performed under operation-like conditions in order to achieve representative microstructures and material data for the subsequent microstructural work. The microstructures were microscopically investigated in a scanning electron microscope (SEM) using electron channeling contrast imaging (ECCI) as well as using light optical microscopy. The outcome of this work has shown that there is a significant increase in crack growth rate when dwell-times are introduced at the maximum load (0% overload) in the fatigue cycle. With the introduction of a dwell-time there is also a shift from transgranular to intergranular crack growth for both Inconel 718 and Haynes 282. When an overload is applied prior to the dwell-time, the crack growth rate decreases with increasing overload levels in Inconel 718. At high temperature crack growth in Inconel 718 took place as intergranular crack growth along grain boundaries due to oxidation and the creation of nanometric voids. Another observed growth mechanism was crack advance along phase boundaries with subsequent severe oxidation of the phase. This thesis comprises two parts. The first giving an introduction to the field of superalloys and the acting microstructural mechanisms that influence fatigue during dwell times. The second part consists of two appended papers, which report the work completed so far in the project.
Book Synopsis The Effect of Elevated Temperature Pre-exposure on the Creep-fatigue Crack Growth Behaviour of a Polycrystalline Nickel-base Superalloy by : D. W. Hunt
Download or read book The Effect of Elevated Temperature Pre-exposure on the Creep-fatigue Crack Growth Behaviour of a Polycrystalline Nickel-base Superalloy written by D. W. Hunt and published by . This book was released on 2000 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Effects of Loading Waveform on Fatigue Crack Growth at Elevated Temperature in Nickel Base Superalloys by : S. Dalby
Download or read book Effects of Loading Waveform on Fatigue Crack Growth at Elevated Temperature in Nickel Base Superalloys written by S. Dalby and published by . This book was released on 1999 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Elevated Temperature Fatigue Crack Growth in a Nickel Base Superalloy Under Dwell Conditions by : J. Byrne
Download or read book Elevated Temperature Fatigue Crack Growth in a Nickel Base Superalloy Under Dwell Conditions written by J. Byrne and published by . This book was released on 1991 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Effect of Loading Waveform on Fatigue Crack Growth at Elevated Temperature in Nickel Base Superalloys by : S. Dalby
Download or read book Effect of Loading Waveform on Fatigue Crack Growth at Elevated Temperature in Nickel Base Superalloys written by S. Dalby and published by . This book was released on 1999 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author :National Aeronautics and Space Administration (NASA) Publisher :Createspace Independent Publishing Platform ISBN 13 :9781721259212 Total Pages :34 pages Book Rating :4.2/5 (592 download)
Book Synopsis High Temperature Fatigue Crack Growth Behavior of Alloy 10 by : National Aeronautics and Space Administration (NASA)
Download or read book High Temperature Fatigue Crack Growth Behavior of Alloy 10 written by National Aeronautics and Space Administration (NASA) and published by Createspace Independent Publishing Platform. This book was released on 2018-06-19 with total page 34 pages. Available in PDF, EPUB and Kindle. Book excerpt: Methods to improve the high temperature, dwell crack growth resistance of Alloy 10, a high strength, nickel-base disk alloy, were studied. Two approaches, heat treat variations and composition modifications, were investigated. Under the heat treat approach, solution temperature, cooling rates, and stabilization, were studied. It was found that higher solution temperatures, which promote coarser grain sizes, coupled with a 1550 F stabilization treatment were found to significantly reduce dwell crack growth rates at 1300 F Changes in the niobium and tantalum content were found to have a much smaller impact on crack growth behavior. Lowering the niobium:tantalum ratio did improve crack growth resistance and this effect was most pronounced for coarse grain microstructures. Based on these findings, a coarse grain microstructure for Alloy 10 appears to be the best option for improving dwell crack growth resistance, especially in the rim of a disk where temperatures can reach or exceed 1300 T. Further, the use of advanced processing technologies, which can produce a coarse grain rim and fine grain bore, would be the preferred option for Alloy 10 to obtain the optimal balance between tensile, creep, and crack growth requirements for small gas turbine engines. Gayda, John Glenn Research Center NASA/TM-2001-210814, E-12729, NAS 1.15:210814
Book Synopsis Fatigue Crack Propagation of Nickel-Base Superalloys at 650°C by : TP. Gabb
Download or read book Fatigue Crack Propagation of Nickel-Base Superalloys at 650°C written by TP. Gabb and published by . This book was released on 1988 with total page 17 pages. Available in PDF, EPUB and Kindle. Book excerpt: The 650°C fatigue crack propagation behavior of two nickel-base superalloys, René 95 and Waspaloy, were studied with particular emphasis placed on understanding the roles of creep, environment, and two key grain boundary alloying additions, boron and zirconium. Comparison of air and vacuum data showed the air environment to be detrimental over a wide range of frequencies for both alloys. In-depth analysis of René 95 showed that at lower frequencies, such as 0.02 Hz, failure in air occurred by intergranular, environmentally assisted creep crack growth, while at higher frequencies, up to 5.0 Hz, environmental interactions were still evident but creep effects were minimized. The effect of boron and zirconium in Waspaloy was found to be important where environmental and/or creep interactions were present. In those instances, removal of boron and zirconium dramatically increased crack growth. It is therefore plausible that effective dilution of these elements may explain, in part, a previously observed trend in which crack growth rates increased with decreasing grain size.
Book Synopsis Mechanisms and Modelling of Environment-Dependent Fatigue Crack Growth in a Nickel Based Superalloy by : H. Ghonem
Download or read book Mechanisms and Modelling of Environment-Dependent Fatigue Crack Growth in a Nickel Based Superalloy written by H. Ghonem and published by . This book was released on 1991 with total page 252 pages. Available in PDF, EPUB and Kindle. Book excerpt: At loading frequencies below that of the transitional frequency level, which is typical of mission cycles of jet engines, the elevated temperature fatigue crack growth process in Alloy 718 is viewed to be fully environment-dependent. Of all the crack growth stages, this process, while is the most critical in high temperature application due to its highly accelerated crack growth rate, is the least studied or understood. The objective of this research program is to focus on the understanding or the mechanism controlling this oxidation-dependent stage in order to develop the ability to predict its associated crack growth performance under different environment conditions. For this purpose, three major studies have been carried out; the first was to provide evidence of the existence of the fully environment-dependent stage in which the crack growth rate would be equal to the oxygen penetration rate at the crack tip. The second study was to establish a crack tip oxidation mechanism on the basis of material, environmental and loading parameters interactions in the crack tip region. The last objective of this program is to establish a micromechanical based quantitative model to predict the environmentally-dominated crack growth stage.
Book Synopsis The Effects of Frequency and Waveshape on the Fatigue Crack Growth of an Advanced Nickel Base Superalloy at Elevated Temperatures by : Sara Dalby
Download or read book The Effects of Frequency and Waveshape on the Fatigue Crack Growth of an Advanced Nickel Base Superalloy at Elevated Temperatures written by Sara Dalby and published by . This book was released on 2002 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis The Effects of Environment on the Elevated Temperature Fatigue Behavior of Nickel-Base Superalloy Single Crystals by : D. J. DUQUETTE
Download or read book The Effects of Environment on the Elevated Temperature Fatigue Behavior of Nickel-Base Superalloy Single Crystals written by D. J. DUQUETTE and published by . This book was released on with total page 7 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Short Fatigue Crack Growth in a Nickel-base Superalloy at Room and Elevated Temperature by : J. C. Healy
Download or read book Short Fatigue Crack Growth in a Nickel-base Superalloy at Room and Elevated Temperature written by J. C. Healy and published by . This book was released on 1990 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Near-Threshold Crack Growth in Nickel-Base Superalloys by : HR. Van Stone
Download or read book Near-Threshold Crack Growth in Nickel-Base Superalloys written by HR. Van Stone and published by . This book was released on 1988 with total page 24 pages. Available in PDF, EPUB and Kindle. Book excerpt: The influence of stress ratio on the elevated-temperature crack growth behavior of the nickel-base superalloys René 95 and Alloy 718 is discussed. The near-threshold and Region II crack growth behavior of a wide variety of microstructures for each alloy are explained using phenomenological descriptions of closure, that is, K-dependent or K-independent closure. K-dependent closure is the type of closure observed for nickel-base superalloys where increasing the R-ratio causes a uniform lateral shift of the entire fatigue crack growth curve. K-independent closure is the type commonly reported for steels and titanium alloys where increasing the R-ratio has a larger influence on near-threshold crack growth than on Region II crack growth. The existence of K-dependent closure in nickel-base superalloys results in microstructurally sensitive crack growth rates, even at high R-ratios. This permits the use of K-based crack growth prediction techniques and simplifies alloy and process development for applications having complex loading spectra.
Book Synopsis The Effect of Elevated Temperature Pre-exposure on the Crack Growth Behaviour of a Polycrystalline Nickel-base Superalloy by : D. W. Hunt
Download or read book The Effect of Elevated Temperature Pre-exposure on the Crack Growth Behaviour of a Polycrystalline Nickel-base Superalloy written by D. W. Hunt and published by . This book was released on 2000 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Near Threshold Corrosion Fatigue Crack Growth Behavior of a Nickel Base Superalloy in Air and Inert Environments by : James Lum Yuen
Download or read book Near Threshold Corrosion Fatigue Crack Growth Behavior of a Nickel Base Superalloy in Air and Inert Environments written by James Lum Yuen and published by . This book was released on 1982 with total page 412 pages. Available in PDF, EPUB and Kindle. Book excerpt:
