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Low cycle fatigue of cast gamma-TiAl based alloys at high temperature
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SYSNO ASEP 0354105 Druh ASEP J - Článek v odborném periodiku Zařazení RIV J - Článek v odborném periodiku Poddruh J Článek ve WOS Název Low cycle fatigue of cast gamma-TiAl based alloys at high temperature Tvůrce(i) Petrenec, Martin (UFM-A)
Šmíd, Miroslav (UFM-A) RID, ORCID
Kruml, Tomáš (UFM-A) RID, ORCID
Obrtlík, Karel (UFM-A) RID, ORCID
Polák, Jaroslav (UFM-A) RID, ORCIDZdroj.dok. Key Engineering Materials - ISSN 1013-9826
Roč. 452-453, - (2011), s. 421-424Poč.str. 4 s. Jazyk dok. eng - angličtina Země vyd. CH - Švýcarsko Klíč. slova low cycle fatigue ; lamellar TiAl alloys ; high temperature ; PSMs ; fracture surface Vědní obor RIV JL - Únava materiálu a lomová mechanika CEP GA106/07/0762 GA ČR - Grantová agentura ČR GA106/08/1631 GA ČR - Grantová agentura ČR CEZ AV0Z20410507 - UFM-A (2005-2011) UT WOS 000287421700106 DOI 10.4028/www.scientific.net/KEM.452-453.421 Anotace The low-cycle fatigue properties of cast nearly lamellar TiAl alloys with diverse Nb content at room temperature and 750°C were compared. Monotonic tensile curves,cyclic stress-strain curves and combined fatigue life curves were obtained at both temperatures. After cyclic straining the surface relief and the fracture surfaces were observed using scanning electron microscopy. The increase in Nb content significantly improves tensile properties and CSSCs at both temperatures.The combined fatigue life curves especially at 750°C are shifted to higher fatigue lives. The effect o Nb content on the tensile and cyclic strength is discussed in relation to the thickness of the lamellae. Persistent slip markings formed along interlamellar interfaces were predominant locations for fatigue cracks. At both temperatures and materials showed similar crack initiation and propagation behavior. The cracks initiated at surface or in sub-surface region creating smooth flat areas corresponding to the persistent slip bands. Pracoviště Ústav fyziky materiálu Kontakt Yvonna Šrámková, sramkova@ipm.cz, Tel.: 532 290 485 Rok sběru 2011
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