Deformation microstructures after low-cycle fatigue at 950°C in ni-based superalloys: The effect of test conditions

The effect of fatigue-test conditions on microstructures in a AM1 superalloy was investigated by comparing microstructures resulting from low-cycle fatigue tests at imposed stress and imposed strain to those resulting from earlier monotonic tensile and compressive tests (Condat et al., 1987; Decamps...

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Bibliographic Details
Published inScripta metallurgica et materialia Vol. 31; no. 7; pp. 793 - 798
Main Authors Décamps, Brigitte, Brien, Valérie, Morton, Allan J.
Format Journal Article
LanguageEnglish
Published Seoul Elsevier B.V 01.10.1994
Oxford Pergamon Press
New York, NY Elsevier
Subjects
360102 - Metals & Alloys- Structure & Phase Studies
360103 - Metals & Alloys- Mechanical Properties
ALLOYS
Applied sciences
Chemical Sciences
Condensed Matter
Cross-disciplinary physics: materials science; rheology
DEFORMATION
Exact sciences and technology
FATIGUE
Fatigue, corrosion fatigue, embrittlement, cracking, fracture and failure
Fatigue, embrittlement, and fracture
Inorganic chemistry
Material chemistry
MATERIALS SCIENCE
MATERIALS TESTING
MECHANICAL PROPERTIES
MECHANICAL TESTS
Metals. Metallurgy
MICROSTRUCTURE
NICKEL ALLOYS
NICKEL BASE ALLOYS
Optics
Physics
STATIC LOADS
TEMPERATURE RANGE
TEMPERATURE RANGE 1000-4000 K
TESTING
Treatment of materials and its effects on microstructure and properties
Nickel base alloys
Stacking faults
Temperature range 1000-4000 K
Deformation
Transmission electron microscopy
Fatigue
Experimental study
Microstructure
Superalloys
Low cycle fatigue
Transition element alloys
Dislocations
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Summary:The effect of fatigue-test conditions on microstructures in a AM1 superalloy was investigated by comparing microstructures resulting from low-cycle fatigue tests at imposed stress and imposed strain to those resulting from earlier monotonic tensile and compressive tests (Condat et al., 1987; Decamps et al., 1991) where the formation of superlattice stacking faults, responsible for the deformation, has been related to the asymmetry of deformation under tensile and compressive load. It was found that, despite the similarity in the stress rate and the maximum applied stress of the two fatigue tests performed on AM1 single crystal specimens, deformation microstructures produced by the two tests were significantly different. (AIAA)
Bibliography:ObjectType-Article-2
SourceType-Scholarly Journals-1
ObjectType-Feature-1
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ISSN:0956-716X
DOI:10.1016/0956-716X(94)90480-4