The role of Jominy tests in understanding transformations in TiAl-based alloys

David Hu, M. H. Loretto, Aijun Huang, Xinhua Wu

Research output: Chapter in Book/Report/Conference proceedingConference PaperResearchpeer-review

Abstract

The influence of composition and of grain size on the transformation of the high temperature alpha phase during cooling TiAl-based alloys has been studied using end-quench Jominy tests. Longitudinal sections of these quenched samples provide information, over a wide range of cooling rates, on the influence of composition and of the alpha grain size on the solid state transformations. The transformations occurring during cooling lead to two-phase structures (lamellar, Widmanstätten, feathery) and to single-phase structures (massive gamma or to retained alpha) and the factors which influence the balance between these two types of transformation have been investigated. The observations show that the phases formed on cooling can be strongly influenced by diffusion occurring during cooling and by the availability of nucleation sites. The factors favouring the formation of fully massively transformed samples have been clarified and some limited tensile data obtained are presented which have been obtained from fully massive samples which have been HIPped (aged) after quenching.

Original languageEnglish
Title of host publicationTitanium Alloys for High Temperature Applications
Subtitle of host publicationA Symposium Dedicated to the Memory of Dr. Martin Blackburn - Proceedings of Symp. sponsored by the Titanium Committee of the Structural Materials
Pages25-33
Number of pages9
Volume2006
Publication statusPublished - 2006
Externally publishedYes
Event135th TMS Annual Meeting, 2006 - San Antonio, TX, United States of America
Duration: 12 Mar 200616 Mar 2006

Conference

Conference135th TMS Annual Meeting, 2006
CountryUnited States of America
CitySan Antonio, TX
Period12/03/0616/03/06

Keywords

  • End-quenching
  • TiAl alloys
  • Transformations

Cite this

Hu, D., Loretto, M. H., Huang, A., & Wu, X. (2006). The role of Jominy tests in understanding transformations in TiAl-based alloys. In Titanium Alloys for High Temperature Applications: A Symposium Dedicated to the Memory of Dr. Martin Blackburn - Proceedings of Symp. sponsored by the Titanium Committee of the Structural Materials (Vol. 2006, pp. 25-33)
Hu, David ; Loretto, M. H. ; Huang, Aijun ; Wu, Xinhua. / The role of Jominy tests in understanding transformations in TiAl-based alloys. Titanium Alloys for High Temperature Applications: A Symposium Dedicated to the Memory of Dr. Martin Blackburn - Proceedings of Symp. sponsored by the Titanium Committee of the Structural Materials. Vol. 2006 2006. pp. 25-33
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abstract = "The influence of composition and of grain size on the transformation of the high temperature alpha phase during cooling TiAl-based alloys has been studied using end-quench Jominy tests. Longitudinal sections of these quenched samples provide information, over a wide range of cooling rates, on the influence of composition and of the alpha grain size on the solid state transformations. The transformations occurring during cooling lead to two-phase structures (lamellar, Widmanst{\"a}tten, feathery) and to single-phase structures (massive gamma or to retained alpha) and the factors which influence the balance between these two types of transformation have been investigated. The observations show that the phases formed on cooling can be strongly influenced by diffusion occurring during cooling and by the availability of nucleation sites. The factors favouring the formation of fully massively transformed samples have been clarified and some limited tensile data obtained are presented which have been obtained from fully massive samples which have been HIPped (aged) after quenching.",
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Hu, D, Loretto, MH, Huang, A & Wu, X 2006, The role of Jominy tests in understanding transformations in TiAl-based alloys. in Titanium Alloys for High Temperature Applications: A Symposium Dedicated to the Memory of Dr. Martin Blackburn - Proceedings of Symp. sponsored by the Titanium Committee of the Structural Materials. vol. 2006, pp. 25-33, 135th TMS Annual Meeting, 2006, San Antonio, TX, United States of America, 12/03/06.

The role of Jominy tests in understanding transformations in TiAl-based alloys. / Hu, David; Loretto, M. H.; Huang, Aijun; Wu, Xinhua.

Titanium Alloys for High Temperature Applications: A Symposium Dedicated to the Memory of Dr. Martin Blackburn - Proceedings of Symp. sponsored by the Titanium Committee of the Structural Materials. Vol. 2006 2006. p. 25-33.

Research output: Chapter in Book/Report/Conference proceedingConference PaperResearchpeer-review

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N2 - The influence of composition and of grain size on the transformation of the high temperature alpha phase during cooling TiAl-based alloys has been studied using end-quench Jominy tests. Longitudinal sections of these quenched samples provide information, over a wide range of cooling rates, on the influence of composition and of the alpha grain size on the solid state transformations. The transformations occurring during cooling lead to two-phase structures (lamellar, Widmanstätten, feathery) and to single-phase structures (massive gamma or to retained alpha) and the factors which influence the balance between these two types of transformation have been investigated. The observations show that the phases formed on cooling can be strongly influenced by diffusion occurring during cooling and by the availability of nucleation sites. The factors favouring the formation of fully massively transformed samples have been clarified and some limited tensile data obtained are presented which have been obtained from fully massive samples which have been HIPped (aged) after quenching.

AB - The influence of composition and of grain size on the transformation of the high temperature alpha phase during cooling TiAl-based alloys has been studied using end-quench Jominy tests. Longitudinal sections of these quenched samples provide information, over a wide range of cooling rates, on the influence of composition and of the alpha grain size on the solid state transformations. The transformations occurring during cooling lead to two-phase structures (lamellar, Widmanstätten, feathery) and to single-phase structures (massive gamma or to retained alpha) and the factors which influence the balance between these two types of transformation have been investigated. The observations show that the phases formed on cooling can be strongly influenced by diffusion occurring during cooling and by the availability of nucleation sites. The factors favouring the formation of fully massively transformed samples have been clarified and some limited tensile data obtained are presented which have been obtained from fully massive samples which have been HIPped (aged) after quenching.

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Hu D, Loretto MH, Huang A, Wu X. The role of Jominy tests in understanding transformations in TiAl-based alloys. In Titanium Alloys for High Temperature Applications: A Symposium Dedicated to the Memory of Dr. Martin Blackburn - Proceedings of Symp. sponsored by the Titanium Committee of the Structural Materials. Vol. 2006. 2006. p. 25-33