Elevated Temperature Fatigue Crack Growth Of Single Crystal Ren N4 Superalloy

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Elevated Temperature Fatigue Crack Growth Of Single Crystal Ren N4 Superalloy

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Author : S. Venkataraman
language : en
Publisher:
Release Date : 1988

Elevated Temperature Fatigue Crack Growth Of Single Crystal Ren N4 Superalloy written by S. Venkataraman and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1988 with Elevated temperature categories.

Constant-load-amplitude fatigue crack growth tests were conducted at 0.33 Hz over a temperature range of 538 to 871°C for single crystal René N4 nickel base superalloy. Crack growth behavior was found to be similar in the Paris law regime for the entire temperature range tested except for a slight increase in growth rate at 871°C at higher levels of the stress intensity range. Mainly, two distinct modes of fatigue fracture were observed, namely, a flat, featureless, Stage II fracture morphology and a faceted, crystallographic, Stage I cracking mode. The Stage II fatigue fracture occurred over the entire range of ?K at the three highest temperatures. At 538°C, however, a transition from Stage II to Stage I fatigue fracture occurred with increase in ?K. The higher crack growth rates at higher temperatures in the high-stress-intensity range were attributed to casting defects present in the material.

Effect Of Dwell Times On Crack Propagation In Superalloys

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Author : Jonas Saarimäki
language : en
Publisher: Linköping University Electronic Press
Release Date : 2015-12-10

Effect Of Dwell Times On Crack Propagation In Superalloys written by Jonas Saarimäki and has been published by Linköping University Electronic Press this book supported file pdf, txt, epub, kindle and other format this book has been release on 2015-12-10 with categories.

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.

Elevated Temperature Fatigue Crack Growth In A Nickel Base Superalloy Under Dwell Conditions

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Author : J. Byrne
language : en
Publisher:
Release Date : 1991

Elevated Temperature Fatigue Crack Growth In A Nickel Base Superalloy Under Dwell Conditions written by J. Byrne and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1991 with Materials categories.

Superalloys 2020

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Author : Sammy Tin
language : en
Publisher: Springer Nature
Release Date : 2020-08-28

Superalloys 2020 written by Sammy Tin and has been published by Springer Nature this book supported file pdf, txt, epub, kindle and other format this book has been release on 2020-08-28 with Technology & Engineering categories.

The 14th International Symposium on Superalloys (Superalloys 2020) highlights technologies for lifecycle improvement of superalloys. In addition to the traditional focus areas of alloy development, processing, mechanical behavior, coatings, and environmental effects, this volume includes contributions from academia, supply chain, and product-user members of the superalloy community that highlight technologies that contribute to improving manufacturability, affordability, life prediction, and performance of superalloys.

Short Fatigue Crack Growth In A Nickel Base Superalloy At Room And Elevated Temperature

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Author : J. C. Healy
language : en
Publisher:
Release Date : 1990

Short Fatigue Crack Growth In A Nickel Base Superalloy At Room And Elevated Temperature written by J. C. Healy and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1990 with Materials categories.

International Aerospace Abstracts

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Author :
language : en
Publisher:
Release Date : 1999

International Aerospace Abstracts written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1999 with Aeronautics categories.

Thermo Mechanical Fatigue Crack Growth Of A Polycrystalline Superalloy

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Author : Benjamin Scott Adair
language : en
Publisher:
Release Date : 2011

Thermo Mechanical Fatigue Crack Growth Of A Polycrystalline Superalloy written by Benjamin Scott Adair and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2011 with Alloys categories.

A study was done to determine the temperature and load interaction effects on the fatigue crack growth rate of polycrystalline superalloy IN100. Temperature interaction testing was performed by cycling between 316°C and 649°C in blocks of 1, 10 and 100 cycles. Load interaction testing in the form of single overloads was performed at 316°C and 649°C. After compiling a database of constant temperature, constant amplitude FCGR data for IN100, fatigue crack growth predictions assuming no load or temperature interactions were made. Experimental fatigue crack propagation data was then compared and contrasted with these predictions. Through the aid of scanning electron microscopy the fracture mechanisms observed during interaction testing were compared with the mechanisms present during constant temperature, constant amplitude testing. One block alternating temperature interaction testing grew significantly faster than the non-interaction prediction, while ten block alternating temperature interaction testing also grew faster but not to the same extent. One hundred block alternating testing grew slower than non-interaction predictions. It was found that as the number of alternating temperature cycles increased, changes in the gamma prime morphology (and hence deformation mode) caused changes in the environmental interactions thus demonstrating the sensitivity of the environmental interaction on the details of the deformation mode. SEM fractography was used to show that at low alternating cycles, 316°C crack growth was accelerated due to crack tip embrittlement caused by 649°C cycling. At higher alternating cycles the 316°C cycling quickly grew through the embrittled crack tip but then grew slower than expected due to the possible formation of Kear-Wilsdorf locks at 649°C. Overload interaction testing led to full crack retardation at 2.0x overloads for both 316°C and 649°C testing. 1.6x overloading at both temperatures led to retarded crack growth whereas 1.3x overloads at 649°C created accelerated crack growth and at 316°C the crack growth was retarded.

High Temperature Fatigue Crack Growth Behavior Of Alloy 10

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Author :
language : en
Publisher:
Release Date : 2001

High Temperature Fatigue Crack Growth Behavior Of Alloy 10 written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2001 with categories.

Crystallographic Fatigue Crack Propagation In Single Crystal Nickel Base Superalloy

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Author : Otis Yuchia Chen
language : en
Publisher:
Release Date : 1985

Crystallographic Fatigue Crack Propagation In Single Crystal Nickel Base Superalloy written by Otis Yuchia Chen and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1985 with Metals categories.

High Temperature Fatigue Crack Growth In A Cobalt Base Superalloy Hs188

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Author : James Victor Carisella
language : en
Publisher:
Release Date : 1975

High Temperature Fatigue Crack Growth In A Cobalt Base Superalloy Hs188 written by James Victor Carisella and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1975 with Cobalt alloys categories.