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Effect Of Loading Waveform On Fatigue Crack Growth At Elevated Temperature In Nickel Base Superalloys
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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 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:
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 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.
Author :The Minerals, Metals & Materials Society (TMS) Publisher :John Wiley & Sons ISBN 13 :1119016606 Total Pages :958 pages Book Rating :4.1/5 (19 download)
Book Synopsis Proceedings of the 8th International Symposium on Superalloy 718 and Derivatives by : The Minerals, Metals & Materials Society (TMS)
Download or read book Proceedings of the 8th International Symposium on Superalloy 718 and Derivatives written by The Minerals, Metals & Materials Society (TMS) and published by John Wiley & Sons. This book was released on 2014-12-02 with total page 958 pages. Available in PDF, EPUB and Kindle. Book excerpt:
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 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 The Effect of Waveshape on Fatigue Crack Growth in Nickel Superalloys at Elevated Temperature by : Victoria Hodkinson
Download or read book The Effect of Waveshape on Fatigue Crack Growth in Nickel Superalloys at Elevated Temperature written by Victoria Hodkinson and published by . This book was released on 1997 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
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 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 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 Influence of Frequency, Stress Ratio and Stress State on Fatigue Crack Growth in Nickel Base Superalloys at Elevated Temperature by : Fernando Jorge Ventura Antunes
Download or read book Influence of Frequency, Stress Ratio and Stress State on Fatigue Crack Growth in Nickel Base Superalloys at Elevated Temperature written by Fernando Jorge Ventura Antunes and published by . This book was released on 1999 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Near-Threshold Fatigue Crack Growth Behavior of Fine-Grain Nickel-Based Alloys by : John A. Newman
Download or read book Near-Threshold Fatigue Crack Growth Behavior of Fine-Grain Nickel-Based Alloys written by John A. Newman and published by . This book was released on 2003 with total page 16 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Effect of Load Variables on Fatigue Crack Initiation and Propagation by : D. F. Bryan
Download or read book Effect of Load Variables on Fatigue Crack Initiation and Propagation written by D. F. Bryan and published by ASTM International. This book was released on 1980 with total page 256 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Mechanical Behaviour of Materials at High Temperature by : C. Moura Branco
Download or read book Mechanical Behaviour of Materials at High Temperature written by C. Moura Branco and published by Springer Science & Business Media. This book was released on 1996-06-30 with total page 758 pages. Available in PDF, EPUB and Kindle. Book excerpt: This volume contains the edited version of lectures and selected research contributions presented at the NATO ADVANCED STUDY INSTITUTE on MECHANICAL BEHA VI OUR OF MATERIALS AT HIGH TEMPERATURE, held in Sesimbra, Portugal, 12th-22nd September 1995, and organized by 1ST-Lisbon Institute of Technology, PortugaL The Institute was attended by 88 participants, including 15 lecturers from 17 countries including five CP countries. The lecturers were leading scientists and technologists from universities, research institutions and industry. The students were mainly young PhD students and junior academic or research staff with postgraduate qualifications (MSc or PhD). Fourteen students were from the five CP countries. The students presented research papers or posters during the Institute reporting the current progress of their research projects. A total of thirty three lectures, ten research papers and fifty posters were presented. This book does not contain the poster presentations and seven research papers were selected for publication. All the sessions were very active and quite extensive discussions on scientific aspects took place during the Institute. The Advanced Study Institute provided a forum for interaction among scientists and engineers from different areas of research, and young researchers.
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 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.
