Low cycle fatigue of cast gamma-TiAl based alloys at high temperature

0354105 - ÚFM 2011 RIV CH eng J - Journal Article
Petrenec, Martin - Šmíd, Miroslav - Kruml, Tomáš - Obrtlík, Karel - Polák, Jaroslav
Low cycle fatigue of cast gamma-TiAl based alloys at high temperature.
Key Engineering Materials. Roč. 452-453, - (2011), s. 421-424. ISSN 1013-9826
R&D Projects: GA ČR GA106/07/0762; GA ČR GA106/08/1631
Institutional research plan: CEZ:AV0Z20410507
Keywords : low cycle fatigue * lamellar TiAl alloys * high temperature * PSMs * fracture surface
Subject RIV: JL - Materials Fatigue, Friction Mechanics

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.
Permanent Link: http://hdl.handle.net/11104/0193182