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Acta Metall Sin  2019, Vol. 55 Issue (6): 729-740    DOI: 10.11900/0412.1961.2019.00015
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Ring Rolling Forming and Properties of Ti2AlNb Special Shaped Ring Prepared by Powder Metallurgy
Zhengguan LU1,2,Jie WU1,Lei XU1(),Xiaoxiao CUI1,Rui YANG1
1. Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China
2. School of Materials Science and Engineering, University of Science and Technology of China, Shenyang 110016, China
Cite this article: 

Zhengguan LU,Jie WU,Lei XU,Xiaoxiao CUI,Rui YANG. Ring Rolling Forming and Properties of Ti2AlNb Special Shaped Ring Prepared by Powder Metallurgy. Acta Metall Sin, 2019, 55(6): 729-740.

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Abstract  

Ti2AlNb alloy was considered as the candidate material to replace superalloys such as GH4169 in gas turbine engine applications due to higher strength-weight ratio at elevated temperatures. Powder metallurgy (PM) offers the potential for solving many of the problems associated with the large ingots, such as center-line porosity and chemical inhomogeneity. In order to study the feasibility of preparing Ti2AlNb special shaped ring with large size, PM + ring rolling combined process is considered as a potential method and discussed in this work. PM Ti2AlNb alloy and special shaped ring (D>800 mm) with a nominal composition of Ti-22Al-24.5Nb-0.5Mo (atomic fraction, %) were prepared from pre-alloyed powder using hot isostatic pressing (HIP). Hot compression tests of PM Ti2AlNb alloy and wrought alloy with the same chemical composition were conducted on Gleeble-3800 testing machine under 930~1050 ℃ and 0.001~1 s-1 conditions. Ring rolling was conducted on PM Ti2AlNb special shaped ring by horizontal rolling machine, and the microstructure evolution and properties performance of PM ring after rolling forming process were studied. The results show that the processing window for PM Ti2AlNb alloy is broader than that for wrought alloys, and wrought Ti2AlNb alloy is easier to crack at low temperature or relative high strain rate. PM Ti2AlNb alloy has more homogeneous chemical composition and uniform α2 phase distribution. Stress instability phenomenon of PM Ti2AlNb alloy is more obvious than that of wrought alloy which is related to phase transition of Ti2AlNb alloy. Optimized deformation temperature for PM Ti2AlNb special shaped ring was set as 1030~1045 ℃ with reference to the hot compression results. Ti2AlNb special shaped ring after two rolling steps has no any kinds of defects presented by X-ray testing, ultrasonic testing and fluorescence detection. O laths inside PM Ti2AlNb alloy become shorter and narrow, and α2 phase tends to be a coarser and spherical structure due to the hot deformation. After a typical heat treatment (980 ℃, 2 h, AC+830 ℃, 24 h, AC), nearly B2+O microstructure is obtained in Ti2AlNb special shaped ring. Compared with the undeformed alloy, tensile ductility at room temperature and 650 ℃ of Ti2AlNb ring after hot deformation improves due to the refined O phase structure.

Key words:  Ti2AlNb      powder metallurgy      hot isostatic pressing      ring rolling forming     
Received:  17 January 2019     
ZTFLH:  TG337  

URL: 

https://www.ams.org.cn/EN/10.11900/0412.1961.2019.00015     OR     https://www.ams.org.cn/EN/Y2019/V55/I6/729

Fig.1  Differential size distribution of Ti2AlNb pre-alloyed powder
MaterialAlNbMoONHTi
Pre-alloyed powder10.342.00.890.0750.0110.0026Bal.
Special shaped ring billet10.942.00.850.0800.0190.0023Bal.
Table 1  Chemical compositions of Ti2AlNb pre-alloyed powder and special shaped ring billet
Fig.2  Low (a) and high (b) magnified SEM images of Ti2AlNb pre-alloyed powder prepared by electrode induction melting gas atomization (EIGA) method
Fig.3  SEM images of microstructures of wrought (a) and hot isostatic pressing (HIP) (b) Ti2AlNb samples
Fig.4  Relative density distributions of Ti2AlNb powder metallurgy (PM) alloy on d=3 mm, R=20 mm (a) and d=8 mm, R=50 mm (b) container conditions (d—thickness, R—radius)
Fig.5  Low (a) and high (b) magnified SEM images of microstructure of Ti2AlNb PM special shaped ring billet
MaterialTemperature / ℃σb / MPaσ0.2 / MPaδ5 / %Ψ / %
Ring billet2311049256.59.0
65078862313.511.0
Cylindrical billet2311589528.06.0
65080259512.022.0
Table 2  Tensile properties of Ti2AlNb special shaped ring billet and cylindrical billet
Fig.6  SEM images of microstructures of wrought (a) and HIP (b) Ti2AlNb alloys for hot compression tests
TemperatureTypeStrain rate / s-1
0.0010.010.11
930HIP143248363562
Wrought146288353603
980HIP60168212255
Wrought49172182222
1005HIP59141245310
Wrought54149251337
1030HIP4690102147
Wrought439595154
1050HIP3180160201
Wrought31103153223
Table 3  Peak stresses of Ti2AlNb PM alloy and wrought alloy under different deformation conditions
Fig.7  Morphologies of Ti2AlNb samples after hot compression tests at different temperatures and 0.1 s-1
Fig.8  Low (a, b) and high (c, d) magnified SEM images of microstructures of wrought (a, c) and HIP (b, d) Ti2AlNb alloys after 1030 ℃ and 1 s-1 compression test
Fig.9  Micro-CT pictures of wrought (a) and HIP (b) Ti2AlNb alloys
Fig.10  Counter maps of strain rate sensitivity value (m) for HIP (a) and wrought (b) Ti2AlNb alloys
Fig.11  Rolling pictures of Ti2AlNb PM ring(a) rectangular ring with crack(b) ring rolling process of special shaped ring(c) special shaped ring after machining
Fig.12  Low (a, c) and high (b, d) magnified SEM images of Ti2AlNb PM alloy
ProcessTemperature / ℃σb / MPaσ0.2 / MPaδ5 / %Ψ / %
HIP+rolled23125910915.56.0
121710356.05.0
65095072210.58.0
95873711.018.0
HIP+rolled+HT2311399679.58.0
113797612.513.0
65084868710.515.0
84367813.023.0
Table 4  Tensile properties of Ti2AlNb special shaped ring
Fig.13  SEM images of Ti2AlNb PM alloy after HIP+ring rolled process (a) and HIP+ring rolled+HT process (b, c)
Fig.14  TEM images of Ti2AlNb alloy after HIP (a), HIP+ring rolled (b) and HIP+ring rolled+HT (c) processes
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