Počet záznamů: 1
On the mechanism of fatigue crack initiation in high-angle grain boundaries
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SYSNO ASEP 0557623 Druh ASEP J - Článek v odborném periodiku Zařazení RIV J - Článek v odborném periodiku Poddruh J Článek ve WOS Název On the mechanism of fatigue crack initiation in high-angle grain boundaries Tvůrce(i) Mazánová, Veronika (UFM-A)
Heczko, Milan (UFM-A) ORCID
Polák, Jaroslav (UFM-A) RID, ORCIDCelkový počet autorů 3 Číslo článku 106721 Zdroj.dok. International Journal of Fatigue. - : Elsevier - ISSN 0142-1123
Roč. 158, MAY (2022)Poč.str. 7 s. Jazyk dok. eng - angličtina Země vyd. GB - Velká Británie Klíč. slova stage-i propagation ; high-strain fatigue ; twin boundaries ; crystallographic orientation ; slip bands ; intrusions ; extrusions ; nucleation ; growth ; steel ; Fatigue crack initiation ; High-angle grain boundary ; Persistent slip bands ; Extrusions and intrusions ; Void-like discontinuities Vědní obor RIV JG - Hutnictví, kovové materiály Obor OECD Materials engineering CEP GA18-03615S GA ČR - Grantová agentura ČR LQ1601 GA MŠMT - Ministerstvo školství, mládeže a tělovýchovy Způsob publikování Omezený přístup Institucionální podpora UFM-A - RVO:68081723 UT WOS 000792829100008 EID SCOPUS 85122941848 DOI 10.1016/j.ijfatigue.2022.106721 Anotace Fatigue crack initiation in high-angle grain boundaries is often observed experimentally, however, its mechanism is a subject of controversy. Low cycle fatigue loading has been applied to super-austenitic stainless steel Sanicro 25 and surface features developed during cyclic loading with high strain amplitudes were studied and analyzed using SEM, EBSD and FIB cuts. Dense array of persistent slip markings developed on the surface of grains was found. Extrusions and intrusions emerged not only in the direction of the surface but also normal to the grain boundaries. Growing extrusions were bent and started to push two neighbor grains locally apart leading to production of void-like discontinuities. Deepening intrusions produced void-like defects or microcracks on the grain boundary. Both these processes led to the substantial weakening of the grain boundary. Coalescence of void-like discontinuities and microcracks on the grain boundary during cyclic loading led to the production of the grain boundary crack. Presented and discussed experimental findings lead to novel mechanism of high-angle grain boundary crack initiation and raise serious doubts about the theories of brittle-like origin of grain boundary cracks. Pracoviště Ústav fyziky materiálu Kontakt Yvonna Šrámková, sramkova@ipm.cz, Tel.: 532 290 485 Rok sběru 2023 Elektronická adresa https://www.sciencedirect.com/science/article/pii/S0142112322000020?via%3Dihub
Počet záznamů: 1