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Original title:
Effect of Microstructure Change on the Crack Formation of Heat Treated Ti-Al Intermetallic Compound
Authors: Hasegawa, H. ; Nomura, M. ; Haga, H. ; Dlouhý, Ivo ; Fukutomi, H.
Document type: Papers
Conference/Event: New Methods of Damage and Failure Analysis of Structural Parts, Ostrava (CZ), 2012-09-10 / 2012-09-14
Year: 2012
Language: eng
Abstract: Heat treatments were conducted under several conditions in order to clarify the effect of holding temperature, time and cooling rate on microstructure of Ti-46Al-7Nb-0.7Cr-0.2Ni-0.1Si and Ti-45Al-10V (mol%) alloys. Indentation tests were performed in order to understand the effect of beta phase precipitation on crack formation of microstructure controlled Ti-45Al-10V alloy. As for Ti-46Al-7Nb-0.7Cr-0.2Ni-0.1Si alloy, phase condition on several temperatures was estimated experimentally. It is found that the cooling rate where the massive transformation occurs ranges from -300K/s to -5K/s. Furthermore, in order to obtain the fully lamellar structure, the alloy should be cooled slower than -1K/s. As regards the heat treatment on Ti-45Al-10V alloy, fully lamellar structure was formed by cooling from (alfa+gama) two phase state. However, beta precipitates were observed near the lamellar colony boundaries when the material was cooled from (beta+gama) two phase state. Though the cracks are not observed at the specimen cooled at -8x10-2K/s from (alfa+gama) two phase state, the cracks induced by Vickers indentation are observed in most of the heat treated specimens.
Keywords: beta phase precipitation; crack formation; microstructure control; TiAl intermetallic compound
Project no.: ME10117 (CEP)
Funding provider: GA MŠk
Host item entry: New Methods of Damage and Failure Analysis of Structural Parts, ISBN 978-80-248-2802-2
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/11104/0211308
Permalink: http://www.nusl.cz/ntk/nusl-135424
The record appears in these collections:
Research > Institutes ASCR > Institute of Physics of Materials
Conference materials > Papers
Authors: Hasegawa, H. ; Nomura, M. ; Haga, H. ; Dlouhý, Ivo ; Fukutomi, H.
Document type: Papers
Conference/Event: New Methods of Damage and Failure Analysis of Structural Parts, Ostrava (CZ), 2012-09-10 / 2012-09-14
Year: 2012
Language: eng
Abstract: Heat treatments were conducted under several conditions in order to clarify the effect of holding temperature, time and cooling rate on microstructure of Ti-46Al-7Nb-0.7Cr-0.2Ni-0.1Si and Ti-45Al-10V (mol%) alloys. Indentation tests were performed in order to understand the effect of beta phase precipitation on crack formation of microstructure controlled Ti-45Al-10V alloy. As for Ti-46Al-7Nb-0.7Cr-0.2Ni-0.1Si alloy, phase condition on several temperatures was estimated experimentally. It is found that the cooling rate where the massive transformation occurs ranges from -300K/s to -5K/s. Furthermore, in order to obtain the fully lamellar structure, the alloy should be cooled slower than -1K/s. As regards the heat treatment on Ti-45Al-10V alloy, fully lamellar structure was formed by cooling from (alfa+gama) two phase state. However, beta precipitates were observed near the lamellar colony boundaries when the material was cooled from (beta+gama) two phase state. Though the cracks are not observed at the specimen cooled at -8x10-2K/s from (alfa+gama) two phase state, the cracks induced by Vickers indentation are observed in most of the heat treated specimens.
Keywords: beta phase precipitation; crack formation; microstructure control; TiAl intermetallic compound
Project no.: ME10117 (CEP)
Funding provider: GA MŠk
Host item entry: New Methods of Damage and Failure Analysis of Structural Parts, ISBN 978-80-248-2802-2
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/11104/0211308
Permalink: http://www.nusl.cz/ntk/nusl-135424
The record appears in these collections:
Research > Institutes ASCR > Institute of Physics of Materials
Conference materials > Papers
Record created 2013-01-04, last modified 2021-11-24