A novel hot pack rolling of high Nb-TiAl sheet from cast ingot

Z. Z. Shen, J. P. Lin, Y. F. Liang, L. Q. Zhang, Shunli Shang, Zi-kui Liu

Research output: Contribution to journalArticle

27 Citations (Scopus)

Abstract

High-Nb containing (6-10 at.%) TiAl alloys exhibit excellent high-temperature strength and oxidation resistance. However, they are difficult to be fabricated into sheet in comparison with the conventional TiAl alloys. In the present work, the hot-deformation behavior of a high Nb-TiAl alloy (Ti-45Al-8.5Nb-0.2W-0.2B-0.03Y) was investigated. Hot-rolling process was optimized and carried out directly from the PAM (Plasma Arc Melting) ingot without the hot isostatic pressing (HIP) and hot forging. The hot-rolled sheets were successfully manufactured with dimensions up to 360 mm × 100 mm × 3.5 mm. The microstructure of as-rolled sheet is a typical "near gamma" characteristic with an average grain size about 15 μm. In the view of breakdown the lamellar colonies of high Nb-TiAl alloy ingot, the direct hot-rolling process has advantage over hot can forging and extrusion. Moreover, mechanical properties at room and high temperatures were also tested. Noteworthily, the as-rolled high Nb-TiAl alloy shows superplasticity above 950°C at relatively high strain rate of 5 × 10-4.

Original languageEnglish (US)
Pages (from-to)19-25
Number of pages7
JournalIntermetallics
Volume67
DOIs
StatePublished - Aug 3 2015

Fingerprint

Hot rolling
Ingots
Forging
Plasma arc melting
Superplasticity
Hot isostatic pressing
Hot working
Oxidation resistance
Extrusion
Strain rate
Mechanical properties
Temperature
Microstructure

All Science Journal Classification (ASJC) codes

  • Chemistry(all)
  • Mechanics of Materials
  • Mechanical Engineering
  • Metals and Alloys
  • Materials Chemistry

Cite this

Shen, Z. Z. ; Lin, J. P. ; Liang, Y. F. ; Zhang, L. Q. ; Shang, Shunli ; Liu, Zi-kui. / A novel hot pack rolling of high Nb-TiAl sheet from cast ingot. In: Intermetallics. 2015 ; Vol. 67. pp. 19-25.
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abstract = "High-Nb containing (6-10 at.{\%}) TiAl alloys exhibit excellent high-temperature strength and oxidation resistance. However, they are difficult to be fabricated into sheet in comparison with the conventional TiAl alloys. In the present work, the hot-deformation behavior of a high Nb-TiAl alloy (Ti-45Al-8.5Nb-0.2W-0.2B-0.03Y) was investigated. Hot-rolling process was optimized and carried out directly from the PAM (Plasma Arc Melting) ingot without the hot isostatic pressing (HIP) and hot forging. The hot-rolled sheets were successfully manufactured with dimensions up to 360 mm × 100 mm × 3.5 mm. The microstructure of as-rolled sheet is a typical {"}near gamma{"} characteristic with an average grain size about 15 μm. In the view of breakdown the lamellar colonies of high Nb-TiAl alloy ingot, the direct hot-rolling process has advantage over hot can forging and extrusion. Moreover, mechanical properties at room and high temperatures were also tested. Noteworthily, the as-rolled high Nb-TiAl alloy shows superplasticity above 950°C at relatively high strain rate of 5 × 10-4.",
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A novel hot pack rolling of high Nb-TiAl sheet from cast ingot. / Shen, Z. Z.; Lin, J. P.; Liang, Y. F.; Zhang, L. Q.; Shang, Shunli; Liu, Zi-kui.

In: Intermetallics, Vol. 67, 03.08.2015, p. 19-25.

Research output: Contribution to journalArticle

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AU - Lin, J. P.

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AU - Liu, Zi-kui

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