The High Temperature Strength of Single Crystal Ni-base Superalloys Re-visiting Constant Strain Rate, Creep, and Thermomechanical Fatigue Testing
The result's identifiers
Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F68081723%3A_____%2F24%3A00586601" target="_blank" >RIV/68081723:_____/24:00586601 - isvavai.cz</a>
Result on the web
<a href="https://onlinelibrary.wiley.com/doi/10.1002/adem.202400368" target="_blank" >https://onlinelibrary.wiley.com/doi/10.1002/adem.202400368</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.1002/adem.202400368" target="_blank" >10.1002/adem.202400368</a>
Alternative languages
Result language
angličtina
Original language name
The High Temperature Strength of Single Crystal Ni-base Superalloys Re-visiting Constant Strain Rate, Creep, and Thermomechanical Fatigue Testing
Original language description
The present work takes a new look at the high temperature strength of single crystal (SX) Ni-base superalloys. It compares high temperature constant strain rate (CSR) testing, creep testing, and out-of-phase thermomechanical fatigue (OP TMF) testing, which represent key characterization methods supporting alloy development and component design in SX material science and technology. The three types of tests are compared using the same SX alloy, working with precisely oriented <001>-specimens and considering the same temperature range between 1023 and 1223 K, where climb controlled micro-creep processes need to be considered. Nevertheless, the three types of tests provide different types of information. CSR testing at imposed strain rates of 3.3 x 10(-4) s(-1) shows a yield stress anomaly (YSA) with a YSA stress peak at a temperature of 1073 K. This increase of strength with increasing temperature is not observed during constant load creep testing at much lower deformation rates around 10(-7) s(-1). Creep rates show a usual behavior and increase with increasing temperatures. During OP-TMF loading, the temperature continuously increases/decreases in the compression/tension part of the mechanical strain-controlled cycle (+/- 0.5%). At the temperature, where the YSA peak stress temperature is observed, no peculiarities are observed. It is shown that OP-TMF life is sensitive to surface quality, which is not the case in creep. A smaller number of cycles to failure is observed when reducing the heating rate in the compression/heating part of the mechanical strain-controlled OP-TMF cycle. The results are discussed on a microstructural basis, using results from scanning and transmission electron microscopy, and in light of previous work published in the literature.
Czech name
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Czech description
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Classification
Type
J<sub>imp</sub> - Article in a specialist periodical, which is included in the Web of Science database
CEP classification
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OECD FORD branch
20501 - Materials engineering
Result continuities
Project
<a href="/en/project/GA20-11321S" target="_blank" >GA20-11321S: Influence of microstructure and surface treatments on hydrogen intake in bio-compatible alloys</a><br>
Continuities
I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace
Others
Publication year
2024
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů
Data specific for result type
Name of the periodical
Advanced Engineering Materials
ISSN
1438-1656
e-ISSN
1527-2648
Volume of the periodical
26
Issue of the periodical within the volume
19
Country of publishing house
DE - GERMANY
Number of pages
11
Pages from-to
2400368
UT code for WoS article
001233471100001
EID of the result in the Scopus database
2-s2.0-85194570324