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Beijing, China

Gu H.-P.,Beijing Institute of Technology | Cao L.-M.,Beijing Institute of Technology | Xue M.,Beijing Institute of Technology | Zhou Z.-J.,Baimtec Material Co.
Hangkong Cailiao Xuebao/Journal of Aeronautical Materials | Year: 2014

The influence of stress on the microstructural stability of the DD10 single crystal superalloy was investigated using SEM after long-term aging at 1100°C and stress rupture testing at 1100°C/140 MPa. The results indicate that the TCP (topologically-close-packed) phases formed after aging at 1100°C for 253 h and stress-rupture at 1100°C/140 MPa are μ phases enriched with Re, W, Cr and Mo. The stress promotes the formation of μ phase, and the amount of μ phase increases with the stress increasing at 1100°C/140 MPa. However, stress does not influence the type and morphology of TCP phase. In addition, the stress accelerates the rafting process of γ'. Source


Zhang M.,Aerospace Research Institute of Materials And Processing Technology | Zhang M.,Baimtec Material Co. | Ju Z.,Aerospace Research Institute of Materials And Processing Technology | Gao F.,Aerospace Research Institute of Materials And Processing Technology | And 2 more authors.
Tezhong Zhuzao Ji Youse Hejin/Special Casting and Nonferrous Alloys | Year: 2015

The change of domestic application for patent in Ti alloy and TiAl alloy in nearly 30 years was expounded. Patent distribution of companies, institutes and universities in aviation industry for Ti alloy, TiAl alloy, containing with core and shell used for precision casting, was analyzed. Based on the trendency of patent layout in related technologies abroad and the development of domestic technologies, countermeasures of strengthening domestic patent work and technology innovation in aviation industry were presented, and the patent layout in Ti alloy for aviation industry was prospected. ©, 2015, Journal Office of Special Casting and Nonferrous Alloys. All right reserved. Source


Qiao Z.,Baimtec Material Co. | He J.,Baimtec Material Co. | Huang Y.-L.,China University of Mining and Technology | Li G.-H.,China University of Mining and Technology
Cailiao Gongcheng/Journal of Materials Engineering | Year: 2011

On the basis of moderately increasing sinter temperature to insure the bond strength between beads and joints, the microstructure and mechanical properties of casting Co-Cr-Mo alloy joints under different cooling regime were priority investigated. Group A of castings were vacuum sintered at 1280°C and furnace cooled after original solution treatment. Group B was directly vacuum sintered at 1280°C and furnace cooled to 1200°C, finally cooling to room temperature with flowing Ar atmosphere. Group C slowly cooled in casting die without heat treating. Group D was solution treated between 1200-1240°C and oil cooled. All above of them were as contrast samples with each others. The results showed that mechanical properties of the Group B casting Co-Cr-Mo joints met the technical requirement, after high-temperature vacuum sintering without solution treatment and fast argon gas cooling. Moreover, finer microstructure, smaller disperse carbide M23C6 were obtained by gas cooling. This trial and exploring process improved mechanical performance, increased pass percentage and excused from the solution treatment procedure, so it has actual significance of reducing cost and time as well as increasing product quality and productivity. Source


Sun H.,Shanghai Dianji University | Mo X.-F.,Baimtec Material Co. | Zheng R.-X.,Aluminum Corporation of China
Cailiao Kexue yu Gongyi/Material Science and Technology | Year: 2010

In order to reveal the distribution characteristic of purged gas in degassing tank for molten aluminum cleansing, the Eulerian two-fluid model incorporated with the multiple reference frame method was adopted to predict the gas-liquid flow field that occurs during the rotating spray degassing of aluminum melt. The influences of different factors, such as spinning rotor clearance from the tank bottom, bubble diameter and tank geometry on the flow fields were analyzed. Results show that argon is apt to escape from the central zones of liquid surface. The melt/bubble interfaces in the area near the tank wall are seriously inadequate, which decreases the efficiency of hydrogen removal from the melt, and worsens in the longitudinal section with 45° phase angle. The smaller spinning rotor clearance from the tank bottom, the smaller size bubbles and square degassing tank can improve the gas distribution, and thus have the advantage the hydrogen removal. Source


Shi C.,Baimtec Material Co. | Shi C.,Aerospace Research Institute of Materials And Processing Technology | Cui X.,Baimtec Material Co. | Cui X.,Aerospace Research Institute of Materials And Processing Technology
Tezhong Zhuzao Ji Youse Hejin/Special Casting and Nonferrous Alloys | Year: 2016

Through an analysis of investment castings of typical titanium alloy (Ti-6Al-4V) parts with slender structure by both methods of computer simulation and actual production, effects of titanium alloy part structure on the casting technique were expounded. The correspondence between computer simulation and actual results at different stages was compared to understand the positive guidance and limitation of computer simulation on castings technique. The results show that various casting techniques have little effect on the mold filling process, and the main difference appears on the inside defection at local position. There are limitations on the casting technique according to experience of typical structure. The computer simulation for shrinkage cavities are consistent with actual ones, while the results of gas defection are weak. And the final casting technique needs the optimization of both computer simulation and actual results. © 2016, Journal Office of Special Casting and Nonferrous Alloys. All right reserved. Source

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