Crack initiation in austenitic stainless steel sanicro 25 subjected to thermomechanical fatigue

Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F68081723%3A_____%2F17%3A00480191" target="_blank" >RIV/68081723:_____/17:00480191 - isvavai.cz</a>
Result on the web
<a href="http://dx.doi.org/10.4028/www.scientific.net/SSP.258.273" target="_blank" >http://dx.doi.org/10.4028/www.scientific.net/SSP.258.273</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.4028/www.scientific.net/SSP.258.273" target="_blank" >10.4028/www.scientific.net/SSP.258.273</a>

Result language
angličtina
Original language name
Crack initiation in austenitic stainless steel sanicro 25 subjected to thermomechanical fatigue
Original language description
Thermomechanical fatigue experiments were performed with austenitic stainless Sanicro 25 steel. Several amplitudes of mechanical strain in a wide temperature interval (250-700 °C) were applied to the specimens. Mechanical response was recorded and fatigue lives were obtained. Scanning electron microscopy combined with FIB technique was used to study the mechanism of crack initiation in in-phase and in out-of-phase thermomechanical cycling. Different mechanisms of the crack initiation were found in these two types of loading. During in-phase loading fatigue cracks start in grain boundaries by cracking of the oxide. Cracks grew preferentially along grain boundaries which resulted in rapid crack initiation and low fatigue life. In out-of-phase loading multiple cracks perpendicular to the stress axis developed only after sufficiently thick oxide layer was formed and cracked in low temperature loading half-cycle. The cracks in oxide allowed localized repeated oxidation and finally also cracking. The cracks grow transgranularly and result in longer fatigue life.
Czech name
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Czech description
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Project
Result was created during the realization of more than one project. More information in the Projects tab.
Continuities
P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Publication year
2017
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Article name in the collection
Materials Structure & Micromechanics of Fracture VIII
ISBN
978-3-03835-626-4
ISSN
1662-9779
e-ISSN
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Number of pages
4
Pages from-to
273-276
Publisher name
Trans Tech Publications
Place of publication
Zürrich
Event location
Brno
Event date
Jun 27, 2016
Type of event by nationality
WRD - Celosvětová akce
UT code for WoS article
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