Ring Rolling Forming and Properties of Ti2AlNb Special Shaped Ring Prepared by Powder Metallurgy
Lu Zhengguan1,2; Wu Jie1; Xu Lei1; Cui Xiaoxiao1; Yang Rui1
Corresponding AuthorXu Lei(
AbstractTi2AlNb 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 similar to 1050 degrees C and 0.001 similar to 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 alpha(2) 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 similar to 1045 degrees C 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 alpha(2) phase tends to be a coarser and spherical structure due to the hot deformation. After a typical heat treatment (980 degrees C, 2 h, AC + 830 degrees C, 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 degrees C of Ti2AlNb ring after hot deformation improves due to the refined O phase structure.
KeywordTi2AlNb powder metallurgy hot isostatic pressing ring rolling forming
Indexed BySCI
WOS Research AreaMetallurgy & Metallurgical Engineering
WOS SubjectMetallurgy & Metallurgical Engineering
WOS IDWOS:000468415300006
Citation statistics
Cited Times:1[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Corresponding AuthorXu Lei
Affiliation1.Chinese Acad Sci, Inst Met Res, Shenyang 110016, Liaoning, Peoples R China
2.Univ Sci & Technol China, Sch Mat Sci & Engn, Shenyang 110016, Liaoning, Peoples R China
Recommended Citation
GB/T 7714
Lu Zhengguan,Wu Jie,Xu Lei,et al. Ring Rolling Forming and Properties of Ti2AlNb Special Shaped Ring Prepared by Powder Metallurgy[J]. ACTA METALLURGICA SINICA,2019,55(6):729-740.
APA Lu Zhengguan,Wu Jie,Xu Lei,Cui Xiaoxiao,&Yang Rui.(2019).Ring Rolling Forming and Properties of Ti2AlNb Special Shaped Ring Prepared by Powder Metallurgy.ACTA METALLURGICA SINICA,55(6),729-740.
MLA Lu Zhengguan,et al."Ring Rolling Forming and Properties of Ti2AlNb Special Shaped Ring Prepared by Powder Metallurgy".ACTA METALLURGICA SINICA 55.6(2019):729-740.
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