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Original title:
Microstructure and Anisotropy of Creep in Ti-46Al-2W-0.5Si Castings
Authors: Dlouhý, Antonín ; Kuchařová, Květa ; Svoboda, Milan ; Válek, Robert ; Březina, Josef
Document type: Papers
Conference/Event: International Conference on Materials structure and Micromechanics of Fracture /3./, Brno (CZ), 2001-06-27 / 2001-06-29
Year: 2001
Language: eng
Abstract: The present study investigates microstructure and creep behaviour of the cast alloy Ti-46A1-2W-0.5Si (at-%) at temperatures 700, 750 and 800°C and applied stresses between 250-420 MPa. Solidification of the alloy during precision casting is associated with two processes: (i) the growth of the [0001].alpha. oriented columnar grains from the mould wall into the cast interior and (ii) the enrichment of the central part of the cast with aluminium. The first process results in a fully lamellar microstructure where lamellae are preferentially oriented parallel to the cast surface. The second process contributes to the development of the duplex microstructure in the central part of the cast. It is shown that distinct microstructural types in different regions of the cast result in different creep strengths. Specimens taken from inside of the cast and oriented parallel to the cast bar axis exhibited the lowest creep strength while similarly oriented specimens cut from the fully lamellar region near the cast surface were the strongest. The third type of the creep specimens cut out of the central region of the cast and oriented perpendicular to the cast bar axis showed the intermediate creep strength. The observed variations of the creep strength are associated with the preferential orientation of the lamellas and with the fraction of equiaxed .gamma.-grains in the duplex regions of the cast.
Keywords: gamma-TiAl; gas turbine; intermetallics
Project no.: CEZ:AV0Z2041904 (CEP), OC 522.100, IBS2041001 (CEP)
Funding provider: GA MŠk, GA AV ČR
Host item entry: MATERIAL STRUCTURE & MICROMECHANICS OF FRACTURE PROCEEDINGS MSMF-3, ISBN 80-214-1892-3
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/11104/0074516
Permalink: http://www.nusl.cz/ntk/nusl-26439
The record appears in these collections:
Research > Institutes ASCR > Institute of Physics of Materials
Conference materials > Papers
Authors: Dlouhý, Antonín ; Kuchařová, Květa ; Svoboda, Milan ; Válek, Robert ; Březina, Josef
Document type: Papers
Conference/Event: International Conference on Materials structure and Micromechanics of Fracture /3./, Brno (CZ), 2001-06-27 / 2001-06-29
Year: 2001
Language: eng
Abstract: The present study investigates microstructure and creep behaviour of the cast alloy Ti-46A1-2W-0.5Si (at-%) at temperatures 700, 750 and 800°C and applied stresses between 250-420 MPa. Solidification of the alloy during precision casting is associated with two processes: (i) the growth of the [0001].alpha. oriented columnar grains from the mould wall into the cast interior and (ii) the enrichment of the central part of the cast with aluminium. The first process results in a fully lamellar microstructure where lamellae are preferentially oriented parallel to the cast surface. The second process contributes to the development of the duplex microstructure in the central part of the cast. It is shown that distinct microstructural types in different regions of the cast result in different creep strengths. Specimens taken from inside of the cast and oriented parallel to the cast bar axis exhibited the lowest creep strength while similarly oriented specimens cut from the fully lamellar region near the cast surface were the strongest. The third type of the creep specimens cut out of the central region of the cast and oriented perpendicular to the cast bar axis showed the intermediate creep strength. The observed variations of the creep strength are associated with the preferential orientation of the lamellas and with the fraction of equiaxed .gamma.-grains in the duplex regions of the cast.
Keywords: gamma-TiAl; gas turbine; intermetallics
Project no.: CEZ:AV0Z2041904 (CEP), OC 522.100, IBS2041001 (CEP)
Funding provider: GA MŠk, GA AV ČR
Host item entry: MATERIAL STRUCTURE & MICROMECHANICS OF FRACTURE PROCEEDINGS MSMF-3, ISBN 80-214-1892-3
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/11104/0074516
Permalink: http://www.nusl.cz/ntk/nusl-26439
The record appears in these collections:
Research > Institutes ASCR > Institute of Physics of Materials
Conference materials > Papers
Record created 2011-07-01, last modified 2021-11-24