Fatigue Crack Initiation in Nickel-Based Superalloy MAR-M247 at High Temperature
The result's identifiers
Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F68081723%3A_____%2F17%3A00478819" target="_blank" >RIV/68081723:_____/17:00478819 - isvavai.cz</a>
Result on the web
<a href="http://dx.doi.org/10.4028/www.scientific.net/KEM.754.27" target="_blank" >http://dx.doi.org/10.4028/www.scientific.net/KEM.754.27</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.4028/www.scientific.net/KEM.754.27" target="_blank" >10.4028/www.scientific.net/KEM.754.27</a>
Alternative languages
Result language
angličtina
Original language name
Fatigue Crack Initiation in Nickel-Based Superalloy MAR-M247 at High Temperature
Original language description
The present work is focused on the study of crack initiation during low cycle fatigue (LCF) loading of the second generation nickel-based superalloy MAR-M247 treated with hot isostatic pressing. LCF tests were conducted on cylindrical specimens in symmetrical push-pull cycle under strain control with constant total strain amplitude and strain rate at 800 °C in air atmosphere. Selected specimens were electrolytically polished to facilitate surface relief observations. Crack initiation sites were studied by means of scanning electron microscopy (SEM) in dual beam microscope TESCAN LYRA 3 XMU FESEM equipped with focus ion beam (FIB). The microstructure of the material is characterised by coarse dendritic grains with numerous carbides and small casting defects. The average grain size was 2.1 ± 0.3 mm. Fractographic analysis revealed the fatigue crack initiation sites and their relation to the casting defects and material microstructure. Casting defects, carbide inclusions and interdendritic areas were found to be important crack nucleation sites. Specimens’ surface observations revealed the formation of pronounced surface relief with short worm-like markings. Fatigue crack initiation in these places is documented and discussed.
Czech name
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Czech description
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Classification
Type
D - Article in proceedings
CEP classification
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OECD FORD branch
20306 - Audio engineering, reliability analysis
Result continuities
Project
<a href="/en/project/GA15-20991S" target="_blank" >GA15-20991S: Plasma deposition, microstructural and thermo-mechanical stability of environmental barrier coatings</a><br>
Continuities
P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)
Others
Publication year
2017
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů
Data specific for result type
Article name in the collection
Advances in Fracture and Damage Mechanics XVI
ISBN
978-3-0357-1168-4
ISSN
1662-9795
e-ISSN
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Number of pages
4
Pages from-to
27-30
Publisher name
Trans Tech Publications Ltd
Place of publication
Zurich
Event location
Florence
Event date
Jul 18, 2017
Type of event by nationality
WRD - Celosvětová akce
UT code for WoS article
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