Fatigue Crack Propagation Of Nickel Base Superalloys At 650c
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Fatigue Crack Propagation Of Nickel Base Superalloys At 650c
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Author : John Gayda
language : en
Publisher:
Release Date : 1985
Fatigue Crack Propagation Of Nickel Base Superalloys At 650c written by John Gayda and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1985 with Heat resistant alloys categories.
The Fracture Morphology Of Nickel Base Superalloys Tested In Fatigue And Creep Fatigue At 650 C
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Author :
language : en
Publisher:
Release Date : 1981
The Fracture Morphology Of Nickel Base Superalloys Tested In Fatigue And Creep Fatigue At 650 C written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1981 with categories.
Fatigue Crack Propagation Of Nickel Base Superalloys At 650 C
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Author : TP. Gabb
language : en
Publisher:
Release Date : 1988
Fatigue Crack Propagation Of Nickel Base Superalloys At 650 C written by TP. Gabb and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1988 with Creep categories.
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.
The Fracture Morphology Of Nickel Base Superalloys Tested In Fatigue And Creep Fatigue At 650 C
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Author : National Aeronautics and Space Administration (NASA)
language : en
Publisher: Createspace Independent Publishing Platform
Release Date : 2018-07-20
The Fracture Morphology Of Nickel Base Superalloys Tested In Fatigue And Creep Fatigue At 650 C written by National Aeronautics and Space Administration (NASA) and has been published by Createspace Independent Publishing Platform this book supported file pdf, txt, epub, kindle and other format this book has been release on 2018-07-20 with categories.
The fracture surfaces of compact tension specimens from seven nickel-base superalloys fatigue tested at 650 C were studied by scanning electron microscopy and optical metallography to determine the nature and morphology of the crack surface in the region of stable growth. Crack propagation testing was performed as part of an earlier study at 650 C in air using a 0.33 Hz fatigue cycle and a creep-fatigue cycle incorporating a 900 second dwell at maximum load. In fatigue, alloys with a grain size greater than 20 micrometers, HIP Astroloy, Waspaloy, and MERL 76, exhibited transgranular fracture. MERL 76 also displayed numerous fracture sites which were associated with boundaries of prior powder particles. The two high strength, fine grain alloys, IN 100 and NASA IIB-7, exhibited intergranular fracture. Rene 95 and HIP plus forged Astroloy displayed a mixed failure mode that was transgranular in the coarse grains and intergranular in the fine grains. Under creep-fatigue conditions, fracture was found to be predominantly intergranular in all seven alloys. Gayda, J. and Miner, R. V. Glenn Research Center NASA-TM-81740, E-793
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.
High Temperature Fatigue Crack Propagation In A Nickel Base Superalloy And Investigation Of The Intergranular Fracture Proess
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Author : Brad Lee Kirkwood
language : en
Publisher:
Release Date : 1982
High Temperature Fatigue Crack Propagation In A Nickel Base Superalloy And Investigation Of The Intergranular Fracture Proess written by Brad Lee Kirkwood and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1982 with categories.
Fatigue Crack Propagation In Nickel Based Superalloys
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Author :
language : en
Publisher:
Release Date : 1981
Fatigue Crack Propagation In Nickel Based Superalloys written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1981 with categories.
Effective Utilization Of Strategic Materials Through Improvement Of Fatigue Crack Propagation Behavior Of Nickel Base Superalloys
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Author : Stephen D. Antolovich
language : en
Publisher:
Release Date : 1985
Effective Utilization Of Strategic Materials Through Improvement Of Fatigue Crack Propagation Behavior Of Nickel Base Superalloys written by Stephen D. Antolovich and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1985 with Materials 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.
The Fatigue Crack Propagation Behavior Of A Polycrystalline Nickel Base Superalloy In The Near Threshold Region
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Author : Santo A. Padula (II.)
language : en
Publisher:
Release Date : 2002
The Fatigue Crack Propagation Behavior Of A Polycrystalline Nickel Base Superalloy In The Near Threshold Region written by Santo A. Padula (II.) and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2002 with categories.