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Original title:
Fatigue life and fracture of cast gamma TiAl intermetallic alloy at room and elevated temperatures
Authors: Petrenec, Martin ; Šmíd, Miroslav ; Polák, Jaroslav
Document type: Papers
Conference/Event: METAL 2011 /20./, Brno (CZ), 2011-05-18 / 2011-05-20
Year: 2011
Language: eng
Abstract: The low-cycle fatigue properties, surface relief and fracture surfaces of cast TiAl alloys with 2 at.% Nb having nearly lamellar microstructure were studied at room temperature and at 750 degrees C. Cyclic stress-strain curves (CSSC) and fatigue life curves were obtained at both temperatures. The surface relief and the fracture surfaces of fractured specimens were observed using scanning electron microscopy. At room temperature, significant cyclic hardening is observed whereas at 750 degrees C cyclic response was stable. Parameters of the CSSC, the Manson-Coffin law and the Basquin law were determined. Persistent slip markings formed along interlamellar interfaces were predominant locations for fatigue cracks at both temperatures. The cracks initiated at surface or in sub-surface region led to the formation of smooth flat areas on the fracture surface corresponding to the persistent slip bands.
Keywords: cast gamma TiAl alloy; elevated temperature; fracture surfaces; low cycle fatigue; PSMs
Project no.: CEZ:AV0Z20410507 (CEP), GAP107/11/0704 (CEP)
Funding provider: GA ČR
Host item entry: METAL 2011 Conference Proceedings - Papers, ISBN 978-80-87294-24-6
Institution: Institute of Physics of Materials AS ČR (web)
Document availability information: Fulltext is available at the institute of the Academy of Sciences.
Original record: http://hdl.handle.net/11104/0243315
Permalink: http://www.nusl.cz/ntk/nusl-180557
The record appears in these collections:
Research > Institutes ASCR > Institute of Physics of Materials
Conference materials > Papers
Authors: Petrenec, Martin ; Šmíd, Miroslav ; Polák, Jaroslav
Document type: Papers
Conference/Event: METAL 2011 /20./, Brno (CZ), 2011-05-18 / 2011-05-20
Year: 2011
Language: eng
Abstract: The low-cycle fatigue properties, surface relief and fracture surfaces of cast TiAl alloys with 2 at.% Nb having nearly lamellar microstructure were studied at room temperature and at 750 degrees C. Cyclic stress-strain curves (CSSC) and fatigue life curves were obtained at both temperatures. The surface relief and the fracture surfaces of fractured specimens were observed using scanning electron microscopy. At room temperature, significant cyclic hardening is observed whereas at 750 degrees C cyclic response was stable. Parameters of the CSSC, the Manson-Coffin law and the Basquin law were determined. Persistent slip markings formed along interlamellar interfaces were predominant locations for fatigue cracks at both temperatures. The cracks initiated at surface or in sub-surface region led to the formation of smooth flat areas on the fracture surface corresponding to the persistent slip bands.
Keywords: cast gamma TiAl alloy; elevated temperature; fracture surfaces; low cycle fatigue; PSMs
Project no.: CEZ:AV0Z20410507 (CEP), GAP107/11/0704 (CEP)
Funding provider: GA ČR
Host item entry: METAL 2011 Conference Proceedings - Papers, ISBN 978-80-87294-24-6
Institution: Institute of Physics of Materials AS ČR (web)
Document availability information: Fulltext is available at the institute of the Academy of Sciences.
Original record: http://hdl.handle.net/11104/0243315
Permalink: http://www.nusl.cz/ntk/nusl-180557
The record appears in these collections:
Research > Institutes ASCR > Institute of Physics of Materials
Conference materials > Papers
Record created 2015-01-26, last modified 2021-11-24