Thermo Mechanical Fatigue Crack Growth Of A Polycrystalline Superalloy
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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.
Thermo Mechanical Fatigue Crack Growth Modeling Of A Nickel Based Superalloy
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Author : Vincent Mark Barker
language : en
Publisher:
Release Date : 2011
Thermo Mechanical Fatigue Crack Growth Modeling Of A Nickel Based Superalloy written by Vincent Mark Barker and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2011 with Heat resistant alloys categories.
A model was created to predict the thermo-mechanical fatigue crack growth rates under typical engine spectrum loading conditions. This model serves as both a crack growth analysis tool to determine residual lifetime of ageing turbine components and as a design tool to assess the effects of temperature and loading variables on crack propagation. The material used in the development of this model was a polycrystalline superalloy, Inconel 100 (IN-100). The first step in creating a reliable model was to define the first order effects that influence TMF crack growth in a typical engine spectrum. Load interaction effects were determined to be major contributors to lifetime estimates by influencing crack growth rates based upon previous load histories. A yield zone model was modified to include temperature dependent properties that controlled the effects of crack growth retardation and acceleration based upon overloads and underloads, respectively. Multiple overload effects were included in the model to create enhanced retardation compared to single overload tests. Temperature interaction effects were also considered very important due to the wide temperature ranges of turbine engine components. Oxidation and changing temperature effects were accounted for by accelerating crack growth in regions that had been affected by higher temperatures. Constant amplitude crack growth rates were used as a baseline, upon which load and temperature interaction effects were applied. Experimental data of isolated first order effects was used to calibrate and verify the model. Experimental data provided the means to verify that the model was a good fit to experimental results. The load interaction effects were described by a yield zone model, which included temperature dependent properties. These properties were determined experimentally and were essential in the model's development to include load and temperature contributions. Other interesting factors became apparent through testing. It was seen that specific combinations of strain rate and temperature would lead to serrated yielding, discovered to be the Portevin-Le Chatelier effect. This effect manifested itself as enhanced hardening, leading to unstable strain bursts in specimens that cyclically yielded while changing temperature.
Thermomechanical Fatigue Behavior Of Materials
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Author : Michael J. Verrilli
language : en
Publisher: ASTM International
Release Date : 1996
Thermomechanical Fatigue Behavior Of Materials written by Michael J. Verrilli and has been published by ASTM International this book supported file pdf, txt, epub, kindle and other format this book has been release on 1996 with categories.
Thermomechanical Fatigue Behavior Of Materials
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Author : Michael A. McGaw
language : en
Publisher: ASTM International
Release Date : 2003
Thermomechanical Fatigue Behavior Of Materials written by Michael A. McGaw and has been published by ASTM International this book supported file pdf, txt, epub, kindle and other format this book has been release on 2003 with Alloys categories.
"ASTM Stock Number: STP1428. - "Fourth Symposium on Thermomechanical Fatigue Behavior of Materials, held in Dallas, Texas on November 7-8, 2001. The Symposium was sponsored by ASTM Committee E08 on Fatigue and Fracture and its Subcommittee E08.05 on Cyclic Deformation and Fat. - Includes bibliographical references and indexes. ASTM International; 2011.
Preliminary Study Of Thermomechanical Fatigue Of Polycrystalline Mar M 200
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Author :
language : en
Publisher:
Release Date : 1984
Preliminary Study Of Thermomechanical Fatigue Of Polycrystalline Mar M 200 written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1984 with Metals categories.
Thermomechanical Fatigue Crack Propagation In An Anisotropic Directionally Solidified Nickel Base Superalloy
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Author : AE. Gemma
language : en
Publisher:
Release Date : 1976
Thermomechanical Fatigue Crack Propagation In An Anisotropic Directionally Solidified Nickel Base Superalloy written by AE. Gemma and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1976 with Crack propagation categories.
Strain-controlled thermomechanical fatigue tests were performed on two nickel-base superalloys, directionally solidified (DS) Mar-M200 plus hafnium and conventionally cast B-1900 plus hafnium. The DS alloy was tested at various angles (?) to the direction of grain growth. It was found that crack growth rates were a minimum for the DS alloy tested parallel to the direction of grain growth (crack propagating normal to the direction of grain growth). The crack growth rate increased for other orientations in the sequence ? = 15, 30 or 90, and 45 deg until equivalence was reached with rates for the conventionally cast alloy, B-1900 plus hafnium. A linear elastic fracture mechanics approach was extended to strain-controlled crack growth as a function of ? for the DS alloy. Prediction of crack growth rates as a function of ? was achieved by normalizing with the elastic modulus. The sequencing of crack growth rates with ? and a smooth-to-rough fracture surface transition are explained on the basis of the orientation dependence of crack opening displacement for a given strain intensity range.
Thermal Mechanical Fatigue Crack Propagation In Nickel And Cobalt Base Superalloys Under Various Strain Temperature Cycles
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Author : AE. Gemma
language : en
Publisher:
Release Date : 1973
Thermal Mechanical Fatigue Crack Propagation In Nickel And Cobalt Base Superalloys Under Various Strain Temperature Cycles written by AE. Gemma and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1973 with Coatings categories.
Crack propagation rates under isothermal and thermal fatigue cycling have been determined for a conventionally-cast cobalt-base superalloy, and conventionally-cast and directionally-solidified nickel-base superalloys. Linear elastic fracture mechanics, where the crack growth rates under different strain ranges or for various crack lengths depend only on the strain intensity factor range, was found to be applicable over the range of crack growth rates of most practical importance. A comparison of crack growth rates is made for thermal fatigue under various strain-temperature cycles and isothermal low-cycle fatigue, and the influence of coatings and superimposed creep is discussed.
Thermo Mechanical Fatigue Behavior Of Materials
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Author : Huseyin Sehitoglu
language : en
Publisher: ASTM International
Release Date : 2000
Thermo Mechanical Fatigue Behavior Of Materials written by Huseyin Sehitoglu and has been published by ASTM International this book supported file pdf, txt, epub, kindle and other format this book has been release on 2000 with Alloys categories.
Development Of A Numerical Procedure For Mixed Mode K Solutions And Fatigue Crack Growth In Fcc Single Crystal Superalloys
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Author : Srikant Ranjan
language : en
Publisher:
Release Date : 2005
Development Of A Numerical Procedure For Mixed Mode K Solutions And Fatigue Crack Growth In Fcc Single Crystal Superalloys written by Srikant Ranjan and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2005 with categories.
ABSTRACT: Fatigue-induced failures in aircraft gas turbine and rocket engine turbopump blades and vanes are a pervasive problem. Turbine blades and vanes represent perhaps the most demanding structural applications due to the combination of high operating temperature, corrosive environment, high monotonic and cyclic stresses, long expected component lifetimes and the enormous consequence of structural failure. Single crystal nickel-base superalloy turbine blades are being utilized in rocket engine turbopumps and jet engines because of their superior creep, stress rupture, melt resistance, and thermomechanical fatigue capabilities over polycrystalline alloys. These materials have orthotropic properties making the position of the crystal lattice relative to the part geometry a significant factor in the overall analysis.
Thermomechanical Fatigue Behavior Of Materials
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Author :
language : en
Publisher:
Release Date : 2003
Thermomechanical Fatigue Behavior Of Materials written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2003 with Alloys categories.