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

被引：46
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.
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页码：19 / 25
页数：7
相关论文
共 28 条
[1]   Nano-scale design of TiAl alloys based on β-phase decomposition [J].
Appel, F ;
Oehring, M ;
Paul, JDH .
ADVANCED ENGINEERING MATERIALS, 2006, 8 (05) :371-376
[2]   Novel design concepts for gamma-base titanium aluminide alloys [J].
Appel, F ;
Oehring, M ;
Wagner, R .
INTERMETALLICS, 2000, 8 (9-11) :1283-1312
[3]   Designed fully lamellar microstructures in a γ-TiAl based alloy:: adjustment and micro, structural changes upon long-term isothermal exposure at 700 and 800°C [J].
Beschliesser, M ;
Chatterjee, A ;
Lorich, A ;
Knabl, W ;
Kestler, H ;
Dehm, G ;
Clemens, H .
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING, 2002, 329 :124-129
[4]   Micro segregation in high Nb containing TiAl alloy ingots beyond laboratory scale [J].
Chen, G. L. ;
Xu, X. J. ;
Teng, Z. K. ;
Wang, Y. L. ;
Lin, J. P. .
INTERMETALLICS, 2007, 15 (5-6) :625-631
[5]  
Chen GL, 1999, GAMMA TITANIUM ALUMINIDES 1999, P371
[6]   In and ex situ investigations of the β-phase in a Nb and Mo containing γ-TiAl based alloy [J].
Clemens, H. ;
Chladil, H. F. ;
Wallgram, W. ;
Zickler, G. A. ;
Gerling, R. ;
Liss, K. -D. ;
Kremmer, S. ;
Guether, V. ;
Smarslyg, W. .
INTERMETALLICS, 2008, 16 (06) :827-833
[7]   Structural characterization and tensile properties of a high niobium containing gamma TiAl sheet obtained by powder metallurgical processing [J].
Gerling, R ;
Bartels, A ;
Clemens, H ;
Kestler, H ;
Schimansky, FP .
INTERMETALLICS, 2004, 12 (03) :275-280
[8]   Alloy design concepts for refined gamma titanium aluminide based alloys [J].
Imayev, R. M. ;
Imayev, V. M. ;
Oehring, M. ;
Appel, F. .
INTERMETALLICS, 2007, 15 (04) :451-460
[9]   Microstructural evolution during hot working of Ti aluminide alloys: Influence of phase constitution and initial casting texture [J].
R. M. Imayev ;
V. M. Imayev ;
M. Oehring ;
F. Appel .
Metallurgical and Materials Transactions A, 2005, 36 (3) :859-867
[10]   Superplastic properties of Ti-45.2Al-3.5(Nb,Cr,B) sheet material rolled below the eutectoid temperature [J].
Imayev, VM ;
Imayev, RM ;
Kuznetsov, AV ;
Shagiev, MR ;
Salishchev, GA .
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING, 2003, 348 (1-2) :15-21
123