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

被引：45
作者：
Shen, Z. Z. [1 ]
Lin, J. P. [1 ]
Liang, Y. F. [1 ]
Zhang, L. Q. [1 ]
Shang, S. L. [2 ]
Liu, Z. K. [2 ]
机构：
[1] Univ Sci & Technol Beijing, State Key Lab Adv Met & Mat, Beijing 100083, Peoples R China
[2] Penn State Univ, Dept Mat Sci & Engn, University Pk, PA 16802 USA
来源：
INTERMETALLICS | 2015年 / 67卷
基金：
中国国家自然科学基金;
关键词：
Titanium aluminides; Mechanical properties; Rolling; microstructure; MECHANICAL-PROPERTIES; TENSILE PROPERTIES; DESIGN CONCEPTS; BETA-PHASE; ALLOY; MICROSTRUCTURES; EVOLUTION; BEHAVIOR; MICRO;
D O I：
10.1016/j.intermet.2015.07.009
中图分类号：
O64 [物理化学（理论化学）、化学物理学];
学科分类号：
070304 ; 081704 ;
摘要：
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 x 100 mm x 3.5 mm. The microstructure of as-rolled sheet is a typical "near gamma" characteristic with an average grain size about 15 mu m. 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 degrees C at relatively high strain rate of 5 x 10(-4). (C) 2015 Elsevier Ltd. All rights reserved.
引用
收藏
页码：19 / 25
页数：7
相关论文
共 28 条
  • [21] Microstructure and mechanical properties of large size Ti-43Al-9V-0.2Y alloy pancake produced by pack-forging
    Su, Yongjun
    Kong, Fantao
    Chen, Yuyong
    Gao, Na
    Zhang, Deliang
    [J]. INTERMETALLICS, 2013, 34 : 29 - 34
  • [22] Alloying mechanism of beta stabilizers in a TiAl alloy
    Sun, FS
    Cao, CX
    Kim, SE
    Lee, YT
    Yan, MG
    [J]. METALLURGICAL AND MATERIALS TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE, 2001, 32 (07): : 1573 - 1589
  • [23] Review of alloy and process development of TiAl alloys
    Wu, Xinhua
    [J]. INTERMETALLICS, 2006, 14 (10-11) : 1114 - 1122
  • [24] On the microsegregration of Ti-45Al-(8-9)Nb-(W, B, Y) alloy
    Xu, X. J.
    Lin, J. P.
    Teng, Z. K.
    Wang, Y. L.
    Chen, G. L.
    [J]. MATERIALS LETTERS, 2007, 61 (02) : 369 - 373
  • [25] Pilot processing and microstructure control of high Nb containing TiAl alloy
    Xu, XJ
    Xu, LH
    Lin, JP
    Wang, YL
    Lin, Z
    Chen, GL
    [J]. INTERMETALLICS, 2005, 13 (3-4) : 337 - 341
  • [26] EFFECTS OF NB ADDITION ON OXIDATION BEHAVIOR OF TIAL
    YOSHIHARA, M
    MIURA, K
    [J]. INTERMETALLICS, 1995, 3 (05) : 357 - 363
  • [27] Zhang D., 2000, SCRIPTA MATER, V42, P2059
  • [28] Recovery, recrystallization and phase transformations during thermomechanical processing and treatment of TiAl-based alloys
    Zhang, WJ
    Lorenz, U
    Appel, F
    [J]. ACTA MATERIALIA, 2000, 48 (11) : 2803 - 2813
123