Abstract
Ti2AlNb-based alloys have received considerable attention as potential materials to replace the nickel alloy at 600-750 °C, depending on their advantages of high specific strength, good corrosion and oxidation resistance. To realize the precision and performance control for Ti2AlNb-based alloy thin-walled components, the microstructure evolution was analyzed for setting up the unified viscoplastic constitutive equations based on the physical variables and simulating the forming process coupled between the deformation and the microstructure evolution. Through the finite element model with coupling of microstructure and mechanical parameters, the microstructure evolution and shape fabricating can be predicted at the same time, to provide the basis for the process parameters optimization and performance control. With the reasonable process parameters for hot gas forming of Ti2AlNb thin-walled components, the forming precision and performance can be controlled effectively.
Highlights
With the rapid development of aerospace industry, the speed of aircrafts has been dramatically improved, resulting in higher requirement on heat-resistant and lightweight materials
The finite element model of hot gas forming was established based on the unified viscoplastic constitutive model with coupling of microstructure and mechanical parameters
The microstructure evolution and shape fabricating for the hot gas forming of Ti-22Al-24Nb0.5Mo quadrate tube was predicted by simulation
Summary
With the rapid development of aerospace industry, the speed of aircrafts has been dramatically improved, resulting in higher requirement on heat-resistant and lightweight materials In this case, the Ti2AlNb-based alloys, combing high specific strength, good oxidation resistance and sufficient creep resistance at elevated temperatures, have great potential application in aerospace field [1,2,3]. The simulations of hot gas forming process for the Ti-22Al-24Nb-0.5Mo quadrate tubes were performed using unified viscoplastic constitutive equations. The constitutive equation listed in Eq(1), which considered the microstructure evolutions, including grain size, recrystallization, phase volume fraction, damage, globularization and temperature rise, was established to predict the microstructure evolution and stress variation under a complicated deformation condition. The genetic algorithm toolbox in the MATLAB software was used to optimize the material parameters in the constitutive model
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