Prediction of structure and mechanical properties of titanium alloy Ti-6Al-4V during layer formation of 3D products by additive technology of electron beam cladding
Keywords:titanium alloys, additive technology, cooling rate, microstructure, grain size, mechanical properties, mathematical modeling
AbstractThe problem of providing the necessary operational properties of titanium alloy structural elements produced by additive technologies using filler materials, in particular xBeam 3D Metal Printer electron beam welding technology, is considered. An analytical review of the existing data on the dependence of mechanical properties, grain size and microstructure of the titanium alloy Ti-6Al-4V on the cooling rate of the material has been carried out. On the base of mathematical modeling, temperature fields in the process of multilayer formation of a 3D fillet sample from Ti-6Al-4V alloy, residual stress and distortions are determined. Then macro and microstructure, as well as mechanical properties of the sample material are predicted. Comparison with the results of the experimental study of the macrostructure showed satisfactory accuracy of the modeling. The developed approach can be used to predict the macrostructure and mechanical properties of titanium alloy products obtained by additive layer-forming technologies. But there is a need to obtain experimental data for high cooling rates of material in the range of 100-700 degrees/c.
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