Ring Rolling Forming and Properties of Ti2AlNb Special Shaped Ring Prepared by Powder Metallurgy

doi:10.11900/0412.1961.2019.00015

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 LU^1,²,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

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	Zhengguan LU
	Jie WU
	Lei XU
	Xiaoxiao CUI
	Rui YANG

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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

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

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

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

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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