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Research on Superplastic Forming and Diffusion Bonding for Three-sheet Structure of TC4 Titanium Alloy

Author: MenXiangNan
Tutor: TongGuoQuan
School: Nanjing University of Aeronautics and Astronautics
Course: Materials Processing Engineering
Keywords: TC4 Superplastic Forming / Diffusion Bonding ( SPF / DB ) Numerical Simulation Sandwich structure Bonded ratio Trench
CLC: TG453.9
Type: Master's thesis
Year: 2010
Downloads: 116
Quote: 0
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Abstract


Superplastic forming / diffusion welding ( referred to as SPF / DB) process , Nan Nannan days forming research in the field of one . Titanium alloy of multilayer boards Southern heart structure pieces because of its morphology , the parts lighter weight and simplified the number of parts , has been the focus of process applications . Currently titanium alloy SPF / DB process, although has entered the use stage , but our country compared to the SPF / DB technically developed countries there are still large gaps . Therefore , to carry out the titanium and other advanced materials SPF / DB technology research , has a very important significance to reduce costs and improve component performance , increase in aircraft thrust to weight ratio . In this paper, a numerical simulation using the first method after diffusion bonding of superplastic forming , carried out TC4 three-tier board structure superplastic forming / diffusion welding technology and explore . Firstly, according to the basic principles of superplastic forming and diffusion bonding and deformation mechanism to determine the the TC4 three- plate structure SPF / DB of the experimental program , proposed bonded ratio and grain size of the microstructure analysis of superplastic forming / diffusion factors influencing the process of welding . Superplastic forming process of the TC4 three board structure numerical simulation on the basis of theoretical and experimental process , using the MARC software , optimize the structure of formed parts , to predict forming part wall thickness distribution and discussion of strain rate on the results of shaping and forming time impact of 1x10-3 s-1 for optimum forming strain rate , and get the most constant strain rate conditions superplastic forming under pressure - time (pt) curve . Welded joints bonded ratio and grain size analysis, calculated according to the different diffusion welding parts microstructure formed part wall thickness distribution and forming results to discuss the impact of the amount of deformation of the grain size . The results show that : the overall formed part wall thickness , the largest thinning rate of 32% ; higher rate of diffusion welded joints welded , the maximum value of 100% ; formed grain size than the original grain size was growing up , and the core plate left and right costal and forming the rounded corners of the grain size is smaller than the remaining portion ; better quality of molded parts on panel , the lower panel appears an obvious grooves , Core forming preferably . Comparison of numerical results with the experimental results , both in good agreement with numerical simulation is reliable .

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CLC: > Industrial Technology > Metallurgy and Metal Craft > Welding, metal cutting and metal bonding > Welding process > Pressure welding > Other pressure welding
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