Ageing of C-containing and C-free Ti-15Cr and Ti-15-3

Xinhua Wu, J. Del Prado, D. Hu, A. Huang, M. Q. Chu, M. H. Loretto

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

Abstract

Samples of Ti-15Cr and Ti-15V-3Sn-3Al-3Cr (wt%) containing controlled additions of carbon up to 0.2wt% and different oxygen contents have been quenched and aged at temperatures between 400 and 600°C. Optical, scanning and analytical transmission electron microscopy have been used to characterise the microstructures of the quenched and aged samples. Hardness testing has been used to follow the kinetics and extent of age hardening, which are accelerated in C-containing samples. The addition of carbon results in the formation of Ti(CxOy) precipitates which pin grain boundaries in forged samples so that the grain size in the quenched C-containing samples is about a factor of ten less than that in the C-free samples. In the C-free samples coarse grain boundary alpha tends to form, but in the C-containing samples alpha precipitation is more uniform throughout the beta grains. The extent of omega precipitation is very different in the two alloys; the Ti-15Cr alloy forms athermal omega in the as-quenched samples and large omega precipitates are formed on ageing at 40C No evidence for omega has been obtained in the Ti-15-3. The hardening responses and microstructural observations are interpreted in terms of the different grain boundary oxygen contents in the C-containing and C-free samples and the different roles of omega and of carbon in the two alloys.

Original languageEnglish
Title of host publicationSupplement to THERMEC 2006, 5th International Conference on PROCESSING and MANUFACTURING OF ADVANCED MATERIALS, THERMEC 2006
Pages3595-3600
Number of pages6
Volume539-543
EditionPART 4
Publication statusPublished - 2007
Externally publishedYes
Event5th International Conference on Processing and Manufacturing of Advanced Materials - THERMEC'2006 - Vancouver, Canada
Duration: 4 Jul 20068 Jul 2006

Publication series

NameMaterials Science Forum
NumberPART 4
Volume539-543
ISSN (Print)0255-5476

Conference

Conference5th International Conference on Processing and Manufacturing of Advanced Materials - THERMEC'2006
CountryCanada
CityVancouver
Period4/07/068/07/06

Keywords

  • Beta Ti alloys
  • Carbon
  • Oxygen
  • Precipitation

Cite this

Wu, X., Del Prado, J., Hu, D., Huang, A., Chu, M. Q., & Loretto, M. H. (2007). Ageing of C-containing and C-free Ti-15Cr and Ti-15-3. In Supplement to THERMEC 2006, 5th International Conference on PROCESSING and MANUFACTURING OF ADVANCED MATERIALS, THERMEC 2006 (PART 4 ed., Vol. 539-543, pp. 3595-3600). (Materials Science Forum; Vol. 539-543, No. PART 4).
Wu, Xinhua ; Del Prado, J. ; Hu, D. ; Huang, A. ; Chu, M. Q. ; Loretto, M. H. / Ageing of C-containing and C-free Ti-15Cr and Ti-15-3. Supplement to THERMEC 2006, 5th International Conference on PROCESSING and MANUFACTURING OF ADVANCED MATERIALS, THERMEC 2006. Vol. 539-543 PART 4. ed. 2007. pp. 3595-3600 (Materials Science Forum; PART 4).
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title = "Ageing of C-containing and C-free Ti-15Cr and Ti-15-3",
abstract = "Samples of Ti-15Cr and Ti-15V-3Sn-3Al-3Cr (wt{\%}) containing controlled additions of carbon up to 0.2wt{\%} and different oxygen contents have been quenched and aged at temperatures between 400 and 600°C. Optical, scanning and analytical transmission electron microscopy have been used to characterise the microstructures of the quenched and aged samples. Hardness testing has been used to follow the kinetics and extent of age hardening, which are accelerated in C-containing samples. The addition of carbon results in the formation of Ti(CxOy) precipitates which pin grain boundaries in forged samples so that the grain size in the quenched C-containing samples is about a factor of ten less than that in the C-free samples. In the C-free samples coarse grain boundary alpha tends to form, but in the C-containing samples alpha precipitation is more uniform throughout the beta grains. The extent of omega precipitation is very different in the two alloys; the Ti-15Cr alloy forms athermal omega in the as-quenched samples and large omega precipitates are formed on ageing at 40C No evidence for omega has been obtained in the Ti-15-3. The hardening responses and microstructural observations are interpreted in terms of the different grain boundary oxygen contents in the C-containing and C-free samples and the different roles of omega and of carbon in the two alloys.",
keywords = "Beta Ti alloys, Carbon, Oxygen, Precipitation",
author = "Xinhua Wu and {Del Prado}, J. and D. Hu and A. Huang and Chu, {M. Q.} and Loretto, {M. H.}",
year = "2007",
language = "English",
isbn = "0878494286",
volume = "539-543",
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Wu, X, Del Prado, J, Hu, D, Huang, A, Chu, MQ & Loretto, MH 2007, Ageing of C-containing and C-free Ti-15Cr and Ti-15-3. in Supplement to THERMEC 2006, 5th International Conference on PROCESSING and MANUFACTURING OF ADVANCED MATERIALS, THERMEC 2006. PART 4 edn, vol. 539-543, Materials Science Forum, no. PART 4, vol. 539-543, pp. 3595-3600, 5th International Conference on Processing and Manufacturing of Advanced Materials - THERMEC'2006, Vancouver, Canada, 4/07/06.

Ageing of C-containing and C-free Ti-15Cr and Ti-15-3. / Wu, Xinhua; Del Prado, J.; Hu, D.; Huang, A.; Chu, M. Q.; Loretto, M. H.

Supplement to THERMEC 2006, 5th International Conference on PROCESSING and MANUFACTURING OF ADVANCED MATERIALS, THERMEC 2006. Vol. 539-543 PART 4. ed. 2007. p. 3595-3600 (Materials Science Forum; Vol. 539-543, No. PART 4).

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

TY - GEN

T1 - Ageing of C-containing and C-free Ti-15Cr and Ti-15-3

AU - Wu, Xinhua

AU - Del Prado, J.

AU - Hu, D.

AU - Huang, A.

AU - Chu, M. Q.

AU - Loretto, M. H.

PY - 2007

Y1 - 2007

N2 - Samples of Ti-15Cr and Ti-15V-3Sn-3Al-3Cr (wt%) containing controlled additions of carbon up to 0.2wt% and different oxygen contents have been quenched and aged at temperatures between 400 and 600°C. Optical, scanning and analytical transmission electron microscopy have been used to characterise the microstructures of the quenched and aged samples. Hardness testing has been used to follow the kinetics and extent of age hardening, which are accelerated in C-containing samples. The addition of carbon results in the formation of Ti(CxOy) precipitates which pin grain boundaries in forged samples so that the grain size in the quenched C-containing samples is about a factor of ten less than that in the C-free samples. In the C-free samples coarse grain boundary alpha tends to form, but in the C-containing samples alpha precipitation is more uniform throughout the beta grains. The extent of omega precipitation is very different in the two alloys; the Ti-15Cr alloy forms athermal omega in the as-quenched samples and large omega precipitates are formed on ageing at 40C No evidence for omega has been obtained in the Ti-15-3. The hardening responses and microstructural observations are interpreted in terms of the different grain boundary oxygen contents in the C-containing and C-free samples and the different roles of omega and of carbon in the two alloys.

AB - Samples of Ti-15Cr and Ti-15V-3Sn-3Al-3Cr (wt%) containing controlled additions of carbon up to 0.2wt% and different oxygen contents have been quenched and aged at temperatures between 400 and 600°C. Optical, scanning and analytical transmission electron microscopy have been used to characterise the microstructures of the quenched and aged samples. Hardness testing has been used to follow the kinetics and extent of age hardening, which are accelerated in C-containing samples. The addition of carbon results in the formation of Ti(CxOy) precipitates which pin grain boundaries in forged samples so that the grain size in the quenched C-containing samples is about a factor of ten less than that in the C-free samples. In the C-free samples coarse grain boundary alpha tends to form, but in the C-containing samples alpha precipitation is more uniform throughout the beta grains. The extent of omega precipitation is very different in the two alloys; the Ti-15Cr alloy forms athermal omega in the as-quenched samples and large omega precipitates are formed on ageing at 40C No evidence for omega has been obtained in the Ti-15-3. The hardening responses and microstructural observations are interpreted in terms of the different grain boundary oxygen contents in the C-containing and C-free samples and the different roles of omega and of carbon in the two alloys.

KW - Beta Ti alloys

KW - Carbon

KW - Oxygen

KW - Precipitation

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M3 - Conference Paper

AN - SCOPUS:38349011921

SN - 0878494286

SN - 9780878494286

VL - 539-543

T3 - Materials Science Forum

SP - 3595

EP - 3600

BT - Supplement to THERMEC 2006, 5th International Conference on PROCESSING and MANUFACTURING OF ADVANCED MATERIALS, THERMEC 2006

ER -

Wu X, Del Prado J, Hu D, Huang A, Chu MQ, Loretto MH. Ageing of C-containing and C-free Ti-15Cr and Ti-15-3. In Supplement to THERMEC 2006, 5th International Conference on PROCESSING and MANUFACTURING OF ADVANCED MATERIALS, THERMEC 2006. PART 4 ed. Vol. 539-543. 2007. p. 3595-3600. (Materials Science Forum; PART 4).