Creep behaviour of IN 740 alloy after HAZ thermal cycle simulations
The result's identifiers
Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F68081723%3A_____%2F19%3A00510362" target="_blank" >RIV/68081723:_____/19:00510362 - isvavai.cz</a>
Result on the web
<a href="https://www.sciencedirect.com/science/article/pii/S0308016117301692?via%3Dihub" target="_blank" >https://www.sciencedirect.com/science/article/pii/S0308016117301692?via%3Dihub</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.1016/j.ijpvp.2019.104000" target="_blank" >10.1016/j.ijpvp.2019.104000</a>
Alternative languages
Result language
angličtina
Original language name
Creep behaviour of IN 740 alloy after HAZ thermal cycle simulations
Original language description
In this study, the creep specimens of an age-hardened IN 740 alloy were subjected to heat affected zone (HAZ) thermal cycle simulations using a Gleeble 380 physical simulator. The short-term uniaxial creep tests in tension were carried out at temperatures of 973 and 1023 K and at applied stresses ranging from 220 to 600 MPa to evaluate the effect of welding simulations on the microstructural evolution, creep properties and behaviour of the IN 740 alloy. It was found that the stress exponent, n, of the minimum creep rate is not constant and the evaluated values of n are of the order of ~3 for lower stresses, with the gradual variation of n with an increase of the applied stress up to ~15 at the highest stresses, indicating that the creep testing was carried out in the power-law (dislocation) creep region. Analysis of the creep data leads to the conclusion that the creep behaviour of the simulated HAZ of the IN 740 alloy arises from a synergism between the deformation process that is based on intragranular dislocation processes, involving the glide and climb of mobile dislocations, and grain boundary mediated processes. Finally, an assumption was proposed that both creep deformation and fracture are controlled by the same mechanism(s). Examination of the creep fracture surfaces revealed that the main fracture mode is mixed-mode fracture with dominating intergranular character.
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
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Continuities
I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace
Others
Publication year
2019
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů
Data specific for result type
Name of the periodical
International Journal of Pressure Vessels and Piping
ISSN
0308-0161
e-ISSN
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Volume of the periodical
178
Issue of the periodical within the volume
DEC
Country of publishing house
GB - UNITED KINGDOM
Number of pages
9
Pages from-to
104000
UT code for WoS article
000501396700001
EID of the result in the Scopus database
2-s2.0-85073994783